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Claim inspector
New Features to Enhance Your Medusa and Spree Experience · 7 claims · Why we can say this →
- Artifact type
- customer_email
- Status
- approved
Claim 1
You can now protect your Medusa plugins with enhanced security hooks.
- Type
- security
- Support status
- supported
- Risk level
- medium
Evidence
- code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Medusa plugin hooks — destructive Medusa CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_medusa_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.50)
- code_diff: @@ -0,0 +1,38 @@
+{
+ "name": "medusa-commerce",
+ "version": "1.0.0",
+ "description": "Expert subagent and skills for Medusa v2 development — custom modules with DML data models, workflows with compensation, API routes, subscribers, admin dashboard extensions, Next.js storefronts, payment and fulfillment providers, and TypeScript/Node.js patterns.",
+ "license": "MIT",
+ "keywords": [
+ "medusa",
+ "medusajs",
+ "headless-commerce",
+ "ecommerce",
+ "nodejs",
+ "typescript",
+ "postgresql",
+ "nextjs",
+ "mikroorm",
+ "rest-api",
+ "modules",
+ "workflows",
+ "open-source"
+ ],
+ "interface": {
+ "displayName": "Medusa Commerce",
+ "shortDescription": "Expert subagent and skills for Medusa v2 development — custom modules with DML data models, workflows with compensation,",
+ "longDescription": "Expert subagent and skills for Medusa v2 development — custom modules with DML data models, workflows with compensation, API routes, subscribers, admin dashboard extensions, Next.js storefronts, payment and fulfillment providers, and TypeScript/Node.js patterns.",
+ "category": "Commerce",
+ "websiteURL": "https://orcaqubits-ai.com",
+ "developerName": "Rohit Bajaj, Julekha Khatun"
+ },
+ "author": {
+ "name": "Rohit Bajaj, Julekha Khatun"
+ },
+ "homepage": "https://orcaqubits-ai.com",
+ "repository": {
+ "type": "git",
+ "url": "https://github.com/OrcaQubits/agentic-commerce-skills-plugins"
+ },
+ "hooks": "./hooks/hooks.json"
+} (support 0.50)
Claim 2
These hooks safeguard against destructive Medusa CLI commands.
- Type
- security
- Support status
- supported
- Risk level
- medium
Evidence
- code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Medusa plugin hooks — destructive Medusa CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_medusa_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.63)
- code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Saleor plugin hooks — destructive Saleor CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_saleor_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.50)
- code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "BigCommerce plugin hooks — destructive Stencil CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_bc_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+}
Claim 3
These hooks include an asynchronous secret detection feature.
- Type
- security
- Support status
- supported
- Risk level
- medium
Evidence
- code_diff: @@ -0,0 +1,18 @@
+{
+ "description": "NLWeb plugin hooks — async secret detection on code writes",
+ "hooks": {
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)
- code_diff: @@ -0,0 +1,18 @@
+{
+ "description": "A2A plugin hooks — async secret detection on code writes",
+ "hooks": {
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)
- docs_delta: ├── hooks.json # UCP's PostToolUse secret-detection hook (support 0.43)
- code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Spree plugin hooks — destructive Rails command protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_spree_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)
Claim 4
Implement Spree's checkout process with expert knowledge.
- Type
- capability
- Support status
- supported
- Risk level
- low
Evidence
- code_diff: @@ -0,0 +1,203 @@
+---
+name: spree-checkout
+description: >
+ Implement Spree's checkout — the Order state machine (cart → address →
+ delivery → payment → confirm → complete), the Payment and Shipment sub-state
+ machines, the return flow (ReturnAuthorization → CustomerReturn →
+ Reimbursement → Refund), guest checkout, payment-step skipping for
+ credit-covered orders, and the V3 checkout API surface. Use when building or
+ customizing checkout flows, debugging state transitions, or wiring custom
+ checkout steps.
+---
+
+# Spree Checkout
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/core-concepts/orders for the canonical state machine.
+2. Fetch https://spreecommerce.org/docs/developer/core-concepts/payments for the Payment + PaymentSession (v5.4+) flow.
+3. Check the live `Spree::Order` source on GitHub for the `state_machine` block — transitions and callbacks change.
+4. For headless checkout, fetch the v3 Store API docs at https://spreecommerce.org/docs/api-reference.
+5. Verify any custom-step pattern against the latest examples in `spree-starter`.
+
+## Conceptual Architecture
+
+### The Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+ ↓
+ skip if store-credit-covered
+```
+
+Each transition validates prerequisites:
+
+| State | Prerequisites |
+|-------|---------------|
+| `cart` | One or more line items |
+| `address` | Bill + ship address present |
+| `delivery` | Shipping method selected for every shipment |
+| `payment` | At least one payment method valid for the total |
+| `confirm` | Optional review step (configurable) |
+| `complete` | All sub-states valid; transitions trigger fulfillment + emails |
+
+### Payment Sub-State
+
+`Order#payment_state` is a separate field summarizing all `Payment` rows:
+
+| Value | Meaning |
+|-------|---------|
+| `balance_due` | Outstanding amount remains |
+| `paid` | Fully paid |
+| `credit_owed` | Refund pending |
+| `failed` | All payments failed |
+| `void` | Voided |
+
+### Shipment Sub-State
+
+`Order#shipment_state` summarizes all `Shipment` rows:
+
+| Value | Meaning |
+|-------|---------|
+| `pending` | Awaiting payment / stock |
+| `ready` | Ready to ship |
+| `partial` | Some shipped |
+| `shipped` | All shipped |
+| `backorder` | Inventory shortfall |
+| `canceled` | Canceled |
+
+### Individual Shipment / Payment State Machines
+
+- **`Shipment#state`**: `pending → ready → shipped` (+ `canceled`)
+- **`Payment#state`**: `checkout → processing → pending → completed` (+ `failed`, `void`, `invalid`)
+
+### Return Flow
+
+```
+ReturnAuthorization (authorized | canceled)
+ → CustomerReturn
+ → Reimbursement (pending | reimbursed | errored)
+ → Refund (against original Payment)
+```
+
+`StoreCredit` reimbursements skip the Refund step and credit the user's balance.
+
+### Skipping the Payment Step
+
+If `order.outstanding_balance.zero?` after store-credit/gift-card application, the state machine skips `payment` and goes straight to `confirm`. Useful for free-trial / 100%-off scenarios.
+
+### Guest vs Authenticated Checkout
+
+Spree supports guest checkout by default — orders carry an `email` and `order_token` even without a `User`. The token allows a guest to revisit their order. Convert guests to users post-checkout via `Spree::Order#associate_user!`.
+
+### Custom Checkout Steps
+
+Add a custom step by inserting into the state machine via decorator:
+
+```ruby
+# app/models/spree/order_decorator.rb
+module MyApp::OrderDecorator
+ def self.prepended(base)
+ base.state_machine.before_transition to: :delivery, do: :verify_gift_message
+ end
+
+ def verify_gift_message
+ # …
+ end
+
+ Spree::Order.prepend(self)
+end
+```
+
+Custom steps are powerful but **upgrade-fragile** — Spree's state machine evolves. Prefer events or service objects when you only need to react.
+
+### Checkout via API v3 (v5.4+)
+
+Headless checkout typically:
+
+1. `POST /api/v3/store/cart` — create cart (returns `ord_…` ID + cart token)
+2. `POST /api/v3/store/cart/line_items` — add items
+3. `PUT /api/v3/store/checkout` — set addresses, shipping method, payment method
+4. `POST /api/v3/store/checkout/payment_sessions` — create a PaymentSession (Stripe/Adyen/PayPal)
+5. `POST /api/v3/store/checkout/complete` — finalize
+
+(Verify exact paths in the v3 API reference — endpoint shapes are still settling.)
+
+### Payment Sessions (v5.4+)
+
+The v5.4 `PaymentSession` abstracts the payment-provider handshake. The storefront creates a PaymentSession, the user authorizes via the gateway's hosted UI (Stripe Elements, Adyen Drop-in, PayPal Checkout), and the session is captured into a `Payment` on completion. Provider-specific.
+
+## Implementation Guidance
+
+### Reading the Current State
+
+```ruby
+order.state # one of cart/address/delivery/payment/confirm/complete
+order.payment_state # balance_due/paid/...
+order.shipment_state # pending/ready/...
+order.can_transition?(:complete) # check before triggering
+```
+
+### Triggering Transitions Programmatically
+
+```ruby
+order.next! # advance to the next state if valid
+order.complete! # force to complete if valid (typically last step)
+order.cancel! # cancel + revert inventory
+```
+
+Never call `update_attribute(:state, …)` directly — bypasses callbacks and corrupts inventory/payments.
+
+### Subscribing to Checkout Events
+
+```ruby
+class CheckoutSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :send_welcome_email
+
+ def send_welcome_email(event)
+ return if event.order.user.nil?
+ # …
+ end
+end
+```
+
+Events fire after the database commit — safe to enqueue background jobs.
+
+### Headless Checkout Patterns
+
+- **Always use httpOnly cookies for the cart/order token**, not localStorage.
+- **Confirm the cart server-side before showing the review step** — prices, tax, shipping can change between page loads.
+- **Idempotency-Key headers on `/complete`** — prevent double-charging on retry.
+- **Use Payment Sessions for v5.4+** — they handle 3DS / SCA / Apple Pay / Google Pay uniformly.
+
+### Debugging Stuck Transitions
+
+```ruby
+order.errors.full_messages
+order.valid?(state) # validate for a specific state
+order.checkout_steps # configured step list
+```
+
+### Returns Workflow
+
+```ruby
+ra = Spree::ReturnAuthorization.create!(order: order, return_items: items)
+ra.authorize!
+cr = Spree::CustomerReturn.create!(return_items: ra.return_items, stock_location: location)
+cr.fully_received?
+reimbursement = Spree::Reimbursement.create!(customer_return: cr, order: order)
+reimbursement.perform! # creates Refunds or StoreCredits
+```
+
+### Common Pitfalls
+
+- **Bypassing the state machine** by setting `state` directly → corrupts inventory and payment totals.
+- **Forgetting to recompute totals** after adjusting line items → use `Spree::OrderUpdater`.
+- **Marking a Payment `completed` manually** → use the gateway's capture flow; manual completion skips reconciliation.
+- **Treating `confirm` as required** — it's configurable (`checkout_steps` order).
+- **Headless checkout drift** — the storefront's local state can diverge from the server's `Order#state`. Re-fetch after every mutating call.
+- **Custom decorator on `state_machine`** — survives minor upgrades poorly; prefer event subscribers when possible.
+
+Always re-verify state names and transition guards against the live `Spree::Order` source for the version you target.
Claim 5
This includes understanding the Order state machine, Payment sub-state machines, Payment Sessions, and integrating with payment gateways.
- Type
- capability
- Support status
- supported
- Risk level
- low
Evidence
- docs_delta: refunds, payment state machine, and authoring a custom gateway. Use when (support 0.40)
- code_diff: @@ -0,0 +1,146 @@
+# ucp-agentic-commerce
+
+Universal Commerce Protocol (UCP) — Google/Shopify agentic commerce across REST, MCP, A2A, and Embedded bindings
+
+You are an expert in the Universal Commerce Protocol (UCP) — the open standard co-developed by Google and Shopify for agentic commerce. You help build production-grade UCP implementations for both the **Business** (merchant) and **Platform** (AI agent) sides.
+
+# IMPORTANT: Live Documentation Rule
+
+UCP is an actively evolving protocol with date-based versioning (e.g., `2026-01-23`). Before writing any implementation code:
+
+1. **Always web-search** for the latest specification version and SDK releases before coding.
+2. **Always fetch live docs** from the official sources below for exact schemas, field names, enum values, and SDK method signatures.
+3. **Never assume** a specific schema field or API shape is current — verify against the live spec first.
+4. **Cite the spec version** you are coding against in comments (e.g., `# UCP v2026-01-23`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Spec overview | https://ucp.dev/2026-01-23/specification/overview/ | Architecture, versioning, negotiation |
+| Core concepts | https://ucp.dev/2026-01-23/documentation/core-concepts/ | Roles, layers, namespaces |
+| REST binding | https://ucp.dev/specification/checkout-rest/ | REST endpoint shapes, headers, status codes |
+| MCP binding | https://ucp.dev/specification/checkout-mcp/ | MCP tool definitions, JSON-RPC mapping |
+| A2A binding | https://ucp.dev/specification/checkout-a2a/ | Agent-to-Agent message structure |
+| Embedded checkout | https://ucp.dev/specification/checkout-embedded/ | iframe/postMessage protocol |
+| Order capability | https://ucp.dev/specification/order/ | Order model, webhooks, signatures |
+| Fulfillment ext | https://ucp.dev/specification/fulfillment/ | Shipping/pickup methods, groups, options |
+| Discount ext | https://ucp.dev/specification/discount/ | Discount codes, allocations |
+| Buyer consent ext | https://ucp.dev/specification/buyer-consent/ | GDPR/CCPA consent fields |
+| AP2 mandates ext | https://ucp.dev/specification/ap2-mandates/ | Cryptographic payment mandates |
+| Identity linking | https://ucp.dev/specification/identity-linking/ | OAuth 2.0 flows, scopes |
+| Reference (types) | https://ucp.dev/specification/reference/ | All data models and enums |
+| Schema authoring | https://ucp.dev/documentation/schema-authoring/ | Custom extension schemas |
+| Playground | https://ucp.dev/playground/ | Interactive 8-step flow simulator |
+| Python SDK (GitHub) | https://github.com/Universal-Commerce-Protocol/python-sdk | Pydantic models |
+| JS SDK (GitHub) | https://github.com/Universal-Commerce-Protocol/js-sdk | TypeScript types + Zod schemas |
+| Samples (GitHub) | https://github.com/Universal-Commerce-Protocol/samples | FastAPI server, Node/Hono server, A2A agent |
+| Conformance tests | https://github.com/Universal-Commerce-Protocol/conformance | Test suite for compliance |
+| Google merchant guide | https://developers.google.com/merchant/ucp | Google-specific integration |
+| Shopify MCP server | https://shopify.dev/docs/agents/checkout/mcp | Shopify production MCP endpoint |
+
+# UCP Conceptual Architecture
+
+## Four Roles
+
+- **Platform**: Consumer-facing AI agent or app that orchestrates the shopping journey on behalf of a buyer.
+- **Business**: Merchant of Record. Exposes inventory, retail logic, and checkout. Retains financial liability.
+- **Credential Provider (CP)**: Manages payment instruments and user data. Issues payment tokens (Google Pay, Shop Pay, etc.).
+- **Payment Service Provider (PSP)**: Financial infrastructure — authorization, settlement, card network communication.
+
+## Three-Layer Architecture
+
+1. **Shopping Service Layer**: Core transaction primitives — checkout sessions, line items, totals, messages, status transitions.
+2. **Capabilities Layer**: Major functional domains — Checkout, Orders, Identity Linking. Each capability has independent versioning and can be negotiated separately.
+3. **Extensions Layer**: Composable schemas that extend capabilities — Fulfillment, Discounts, Buyer Consent, AP2 Mandates. Extensions declare which capability they extend and are pruned if the parent is absent.
+
+## Four Transport Bindings
+
+| Binding | Format | When to use |
+|---------|--------|-------------|
+| **REST** | OpenAPI 3.x over HTTPS | Traditional server-to-server integration |
+| **MCP** | JSON-RPC 2.0 (Model Context Protocol) | AI agent tool-calling (Claude, Gemini, etc.) |
+| **A2A** | Agent Card + message parts | Agent-to-Agent autonomous commerce |
+| **Embedded (EP)** | JSON-RPC 2.0 via postMessage | Human escalation in iframe/webview |
+
+All bindings share the same data model — the binding only changes the transport envelope.
+
+## Discovery and Negotiation
+
+- Businesses publish a JSON profile at `/.well-known/ucp` declaring version, services, capabilities, extensions, payment handlers, and signing keys.
+- Platforms send a `UCP-Agent` header with their own profile URI in every request.
+- Business fetches the platform profile, computes the **capability intersection**, prunes orphaned extensions, and returns the negotiated `ucp` object in the response.
+- Version compatibility: platform version must be <= business version; otherwise `version_unsupported` error.
+- Namespaces use reverse-domain naming: `dev.ucp.shopping.checkout`, `com.shopify.shop_pay`, etc.
+
+## Checkout Status State Machine
+
+```
+incomplete --> requires_escalation --> ready_for_complete --> complete_in_progress --> completed
+ | |
+ +------------------------------------> canceled <------------------------------------+
+```
+
+- `incomplete`: Missing required info; agent resolves via API updates.
+- `requires_escalation`: Needs human input; agent hands off via `continue_url`.
+- `ready_for_complete`: All data present; agent can call complete.
+- `complete_in_progress`: Payment processing underway.
+- `completed`: Order placed; response includes `order.id` and `order.permalink_url`.
+- `canceled`: Session terminated.
+
+## Error Severity Model
+
+- `recoverable` — Agent can fix automatically (e.g., add missing shipping address).
+- `requires_buyer_input` — Needs human decision (e.g., item out of stock, pick alternative).
+- `requires_buyer_review` — Buyer must review before proceeding (e.g., high-value order).
+- `escalation` — Must redirect to `continue_url` for merchant-hosted UI.
+
+## Payment Architecture — Trust Triangle
+
+Business <-> PSP <-> Credential Provider. Key rules:
+- Credentials flow from platform to business ONLY.
+- Businesses must NEVER echo credentials back.
+- Payment handlers are **specifications** (not entities) — they define tokenization, accepted methods, and configuration.
+- Three processing scenarios: Digital Wallet (Google Pay, Shop Pay), Direct Tokenization (PSP endpoint), Autonomous Agent (AP2 cryptographic mandates).
+
+## Required HTTP Machinery
+
+- **TLS 1.3 minimum** on all endpoints.
+- **Idempotency-Key** header (UUID) on mutating operations; cached 24+ hours.
+- **Request-Id** header (UUID) for distributed tracing.
+- **UCP-Agent** header with platform profile URI (RFC 8941 structured field).
+- Monetary amounts in **minor currency units** (cents, pence, etc.) as integers.
+
+## Webhook Signature Verification
+
+- Business signs webhooks with **Detached JWT** (RFC 7797) using EC P-256 keys from `signing_keys` in their discovery profile.
+- Platform verifies by fetching the business profile, matching `kid`, and checking the JWT signature.
+- Platform MUST respond 2xx immediately and process asynchronously.
+
+## SDKs and Tooling
+
+- **Python SDK**: Pydantic models auto-generated from UCP JSON schemas. Use `uv` for dependency management.
+- **JavaScript SDK**: TypeScript types + Zod schemas. Available as `@ucp-js/sdk` on npm.
+- **Sample servers**: FastAPI (Python) and Hono (Node.js/TypeScript) reference implementations.
+- **Conformance suite**: 13 test files covering lifecycle, orders, fulfillment, payments, idempotency, security.
+- **Community**: FastUCP (Python decorator framework), SwagUcp (Shopware 6 plugin).
+
+## Versioning
+
+- Format: `YYYY-MM-DD` (e.g., `2026-01-23`).
+- Non-breaking changes (no bump): new optional fields, new endpoints, new enum values.
+- Breaking changes (bump): removing fields, changing types, making fields required, removing operations.
+
+# Your Implementation Workflow
+
+When helping the user implement UCP:
+
+1. **Clarify the role**: Are they building a Business (merchant server), Platform (AI agent), or both?
+2. **Clarify the binding**: REST, MCP, A2A, or Embedded? (They can support multiple.)
+3. **Detect project stack**: Examine existing files to determine Python/FastAPI, Node/TypeScript, etc.
+4. **Web-search the latest spec** before writing any code — fetch the relevant binding page and the reference page for exact schemas.
+5. **Start with discovery**: Implement `/.well-known/ucp` profile first — everything else depends on it.
+6. **Implement incrementally**: Discovery -> Create Checkout -> Update Checkout -> Complete Checkout -> Orders/Webhooks -> Extensions.
+7. **Run conformance tests** against the official test suite after each milestone.
+8. **Never hardcode** schema shapes without verifying against the live spec — always cite the version.
+
Claim 6
Build a headless Next.js storefront for Spree Commerce with comprehensive expertise.
- Type
- capability
- Support status
- supported
- Risk level
- low
Evidence
- docs_delta: | Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend | (support 0.44)
- docs_delta: | Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend | (support 0.44)
- docs_delta: | Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend | (support 0.44)
- docs_delta: | Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend | (support 0.44)
- docs_delta: Spree Headless Next.js Storefront (support 0.56)
- docs_delta: Build with Spree's headless Next.js storefront — the official (support 0.67)
- docs_delta: | `spree/storefront` | Next.js headless storefront | (support 0.56)
- docs_delta: 6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
Claim 7
This includes server-only auth, MeiliSearch faceted catalog, multi-region market routing, and deployment with Vercel/Docker.
- Type
- capability
- Support status
- supported
- Risk level
- low
Evidence
- code_diff: @@ -0,0 +1,174 @@
+---
+name: nlweb-deployment
+description: >
+ Deploy NLWeb to production — Azure App Service (`deploy_azure_webapp.sh` + AI
+ Search + Azure OpenAI), Snowflake Container Services, Cloudflare Worker +
+ AutoRAG, Docker, and self-hosted. Covers env-var conventions, `mode:
+ production` lockdown, scaling, TLS, OAuth, and CI for data reloads. Use when
+ going from local dev to a hosted, internet-facing NLWeb instance.
+---
+
+# NLWeb Deployment
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-azure.md for Azure App Service deployment.
+2. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-snowflake.md for Snowflake Container Services.
+3. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-cloudflare-autorag.md for Cloudflare Worker + AutoRAG.
+4. Fetch https://developers.cloudflare.com/ai-search/how-to/nlweb/ for Cloudflare's hosted NLWeb documentation.
+5. Inspect `deploy_azure_webapp.sh`, `setup.sh`, `startup_aiohttp.sh` in the live repo for current commands.
+6. Web-search the latest release notes for breaking deployment changes.
+
+## Conceptual Architecture
+
+### Deployment Targets Supported
+
+| Target | Notes | Setup doc |
+|--------|-------|-----------|
+| Azure App Service | Reference deployment; ships shell scripts | `docs/setup-azure.md` |
+| Snowflake Container Services | NLWeb runs inside Snowflake compute, closest to data | `docs/setup-snowflake.md` |
+| Cloudflare Worker + AutoRAG | Edge deployment; CF manages indexing | `docs/setup-cloudflare-autorag.md` |
+| Docker | Bring-your-own host | Build from `Dockerfile` if shipped, else manual |
+| Bare Python | systemd + venv on a VM | Use `app-aiohttp.py` directly |
+| WordPress plugin | For WP sites | `code/wordpress/nlweb/` |
+
+### Production Hardening Checklist
+
+Before exposing `/ask` or `/mcp` to the internet:
+
+1. **Set `mode: production`** in `config_webserver.yaml` — disables query-string config overrides.
+2. **Lock down the `sites:` allowlist** in `config_nlweb.yaml` — only the sites you want public.
+3. **Disable `who_endpoint_enabled`** if you don't want federated traffic going to `nlwm.azurewebsites.net`.
+4. **Turn off unused retrieval backends** in `config_retrieval.yaml` (`nlweb_west`, `shopify_mcp` unless needed).
+5. **Configure OAuth** if you need auth (see `nlweb-auth-multitenancy`).
+6. **Set TLS** at the edge (App Service, CF, ALB, etc.).
+7. **Set rate limits** — NLWeb itself has limited built-in protection; do it at the edge.
+8. **Configure CORS** if a browser client calls `/ask` directly.
+9. **Persist conversations** to a real storage provider (`config_storage.yaml`), not in-memory.
+10. **Configure observability** — logs, /mcp/health checks, latency metrics.
+
+### Env Vars vs YAML Config
+
+**Secrets always in env vars** — never in `config_*.yaml`. The convention NLWeb uses:
+
+```yaml
+# config_llm.yaml
+providers:
+ azure_openai:
+ api_key_env: AZURE_OPENAI_API_KEY # references env var, doesn't store value
+ endpoint_env: AZURE_OPENAI_ENDPOINT
+```
+
+`.env` is typical for dev; in cloud deployments use the platform's secret manager (Azure Key Vault, Snowflake secrets, CF Workers KV / Secrets, etc.) and inject as env vars.
+
+### The Two Server Processes
+
+A full production NLWeb deployment may have:
+
+1. **Main aiohttp server** (port 8000) — `/ask`, `/mcp`, `/who`, `/sites`, `/config`, `/api/oauth/*`
+2. **AppSDK adapter** (port 8100) — only if you're integrating with ChatGPT Apps SDK. Optional.
+
+Plus optionally the **Node.js MCP server** in `openai-apps-sdk-integration/` if you want the React widget for ChatGPT.
+
+### Reverse-Proxy Concerns
+
+NLWeb streams SSE. Make sure your reverse proxy:
+- Disables response buffering for `/ask` paths (`X-Accel-Buffering: no` is sent, but nginx still needs `proxy_buffering off`).
+- Sets long timeouts (60-300s) for `/ask` streams.
+- Forwards real client IP (`X-Forwarded-For`) for rate limiting.
+- Terminates TLS — NLWeb assumes plain HTTP behind a TLS-terminating proxy.
+
+### Data Reload as a CI Job
+
+Most deployments reload site data on a schedule:
+
+```yaml
+# .github/workflows/nlweb-reload.yml (sketch)
+on:
+ schedule:
+ - cron: '0 3 * * *' # daily 03:00 UTC
+jobs:
+ reload:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - run: pip install -r requirements.txt
+ - run: python -m data_loading.db_load https://example.com/feed.xml my-site
+ env:
+ AZURE_SEARCH_API_KEY: ${{ secrets.AZURE_SEARCH_API_KEY }}
+ AZURE_OPENAI_API_KEY: ${{ secrets.AZURE_OPENAI_API_KEY }}
+```
+
+Run reload as a separate process — don't bake it into the server's startup.
+
+### Scaling
+
+NLWeb is stateless per-request (state is in conversation storage + the vector backend). Scale horizontally:
+- Multiple app instances behind a load balancer
+- Shared vector backend (cloud-hosted, not Qdrant local file)
+- Shared conversation storage (Qdrant remote / Azure Search / Elasticsearch)
+- Sticky sessions NOT required for `/ask` (each request is self-contained)
+
+LLM and embedding API quota is usually the binding constraint, not CPU.
+
+## Implementation Guidance
+
+### Azure App Service Deployment
+
+Walk through `deploy_azure_webapp.sh` — it provisions:
+- App Service Plan + Web App (Linux, Python 3.11+)
+- Azure AI Search service
+- Azure OpenAI deployment
+- App settings (env vars) wired to the search/openai instances
+
+Customize the resource names, set `WEBSITES_PORT=8000` (or whichever the script uses), deploy via `git push` or `az webapp deploy`. Verify `mode: production` in the deployed `config_webserver.yaml`.
+
+### Snowflake Container Services
+
+NLWeb runs as a containerized service inside Snowflake compute, queries Cortex Search (data is already in Snowflake tables). Use the `setup-snowflake.md` doc — it covers the SPCS service spec, image build, and Cortex Search setup.
+
+### Cloudflare Worker + AutoRAG
+
+Cloudflare maintains a hosted variant. Two options:
+- **Self-host on CF Workers** following `docs/setup-cloudflare-autorag.md` — covers the worker template and AutoRAG wiring.
+- **Use CF's managed deployment** per https://developers.cloudflare.com/ai-search/how-to/nlweb/.
+
+### Docker
+
+If a `Dockerfile` ships in the repo, use it. Otherwise:
+
+```dockerfile
+FROM python:3.11-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . .
+EXPOSE 8000
+CMD ["python", "AskAgent/python/app-aiohttp.py"]
+```
+
+Mount `config/` and `.env` as bind mounts or use env vars + ConfigMaps. Persist `data/db/` (Qdrant local) on a volume if not using a remote vector store.
+
+### Health Checks
+
+- Liveness: `GET /mcp/health` (or `/sites` as a fallback)
+- Readiness: `GET /sites` — fails fast if config is broken
+
+### Logs and Observability
+
+NLWeb logs to stdout via Python `logging`. Wire to your platform's log aggregator (Azure Monitor, CloudWatch, etc.). Key metrics:
+- `/ask` latency (p50, p95, p99) — SSE makes this tricky; measure TTFB and total
+- LLM API errors / 429s
+- Retrieval backend latencies (per-backend)
+- Conversation storage write latency
+
+### Production Failure Modes
+
+- **App boots but `/ask` 500s**: usually an env var missing — check the log for the failing provider.
+- **Streaming requests time out at the proxy**: increase proxy read timeout; turn off proxy buffering.
+- **Cold-start latency**: first request after deploy takes 30-60s as models load. Pre-warm with a synthetic health check.
+- **Bills are huge**: too many LLM calls per query — tune `tool_selection_enabled`, model tiers, and `who_endpoint_enabled`.
+- **Embedding rate limits during data reload**: throttle `--batch-size`, use a separate embedding deployment, or run reloads off-peak.
+
+Always re-fetch the per-target setup doc and `deploy_*.sh` scripts before deploying — these are the most release-sensitive parts of the codebase.
(support 0.50)
code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Magento 2 plugin hooks — destructive CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_magento_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.50)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Spree plugin hooks — destructive Rails command protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_spree_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.38)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Shopify plugin hooks — destructive Shopify CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_shopify_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.50)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Salesforce Commerce plugin hooks — destructive CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_salesforce_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.50)code_diff: @@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+"""PreToolUse hook: block potentially destructive Rails / Spree / database commands."""
+import json, sys, re
+
+# Commands that can cause data loss or production outage — BLOCK these
+DESTRUCTIVE_PATTERNS = [
+ (r'(rails|rake|bin/rails)\s+db:drop', "rails db:drop — drops the database (permanent data loss)"),
+ (r'(rails|rake|bin/rails)\s+db:reset', "rails db:reset — drops and recreates the database"),
+ (r'(rails|rake|bin/rails)\s+db:migrate:reset', "rails db:migrate:reset — drops and re-migrates the database"),
+ (r'(rails|rake|bin/rails)\s+db:purge', "rails db:purge — wipes all data from the database"),
+ (r'(rails|rake|bin/rails)\s+spree_sample:load.*--force', "spree_sample:load --force — overwrites existing data"),
+ (r'DROP\s+(TABLE|DATABASE|SCHEMA)', "SQL DROP statement — permanent data loss"),
+ (r'TRUNCATE\s+TABLE', "SQL TRUNCATE — deletes all table data"),
+ (r'rm\s+(-rf?|.*-r)\s+.*(public/uploads|storage|tmp/cache)', "Removing Rails storage / uploads — irrecoverable"),
+ (r'docker[-\s]compose\s+.*down\s+.*-v', "docker compose down -v — destroys persistent volumes"),
+ (r'rails\s+destroy\s+spree:install', "rails destroy spree:install — removes Spree installation"),
+]
+
+# Commands that should warn but allow
+WARNING_PATTERNS = [
+ (r'(rails|rake|bin/rails)\s+db:migrate', "rails db:migrate — will modify the database schema"),
+ (r'(rails|rake|bin/rails)\s+db:rollback', "rails db:rollback — reverts the last migration"),
+ (r'(rails|rake|bin/rails)\s+db:seed', "rails db:seed — runs seed data scripts"),
+ (r'(rails|rake|bin/rails)\s+spree_sample:load', "spree_sample:load — loads Spree sample data"),
+ (r'(rails|rake|bin/rails)\s+spree:install', "spree:install — initializes Spree in this app"),
+ (r'(rails|rake|bin/rails)\s+assets:precompile', "assets:precompile — precompiles Tailwind/JS assets"),
+ (r'sidekiq\s+', "Starting Sidekiq — background job worker"),
+ (r'bundle\s+exec\s+rspec', "Running RSpec test suite"),
+ (r'heroku\s+(run|releases:rollback|maintenance)', "Heroku production action — verify environment"),
+ (r'docker[-\s]compose\s+.*up', "Starting Docker services"),
+]
+
+
+def main():
+ try:
+ data = json.load(sys.stdin)
+ except (json.JSONDecodeError, EOFError):
+ return
+
+ tool_name = data.get("tool_name", "")
+ if tool_name != "Bash":
+ return
+
+ tool_input = data.get("tool_input", {})
+ command = tool_input.get("command", "")
+
+ # Only inspect commands that look like Rails / Spree / DB / Docker / Heroku ops
+ lower = command.lower()
+ if not any(kw in lower for kw in (
+ "rails", "rake", "bundle", "spree", "sidekiq", "heroku", "docker", "drop ", "truncate "
+ )):
+ return
+
+ # Block destructive patterns
+ for pattern, desc in DESTRUCTIVE_PATTERNS:
+ if re.search(pattern, command, re.IGNORECASE):
+ print(
+ f"Blocked: '{command}' — {desc}. "
+ "This command is potentially destructive. "
+ "Please confirm with the user before running.",
+ file=sys.stderr,
+ )
+ sys.exit(2)
+
+ # Warn on caution patterns
+ warnings = []
+ for pattern, desc in WARNING_PATTERNS:
+ if re.search(pattern, command, re.IGNORECASE):
+ warnings.append(desc)
+
+ if warnings:
+ msg = (
+ f"Spree/Rails CLI notice for '{command}': {'; '.join(warnings)}. "
+ "Ensure this is intentional."
+ )
+ json.dump({"systemMessage": msg}, sys.stdout)
+
+
+if __name__ == "__main__":
+ main() (support 0.63)code_diff: @@ -0,0 +1,18 @@
+{
+ "description": "ACP plugin hooks — async secret detection for payment code",
+ "hooks": {
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Saleor plugin hooks — destructive Saleor CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_saleor_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,18 @@
+{
+ "description": "AP2 plugin hooks — async PCI/secret detection for payment code",
+ "hooks": {
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "BigCommerce plugin hooks — destructive Stencil CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_bc_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Shopify plugin hooks — destructive Shopify CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_shopify_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Medusa plugin hooks — destructive Medusa CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_medusa_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Salesforce Commerce plugin hooks — destructive CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_salesforce_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)code_diff: @@ -0,0 +1,30 @@
+{
+ "description": "Magento 2 plugin hooks — destructive CLI protection + async secret detection",
+ "hooks": {
+ "PreToolUse": [
+ {
+ "matcher": "Bash",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_magento_commands.py\"",
+ "timeout": 10
+ }
+ ]
+ }
+ ],
+ "PostToolUse": [
+ {
+ "matcher": "Write|Edit",
+ "hooks": [
+ {
+ "type": "command",
+ "command": "python \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/check_secrets.py\"",
+ "async": true,
+ "timeout": 30
+ }
+ ]
+ }
+ ]
+ }
+} (support 0.43)docs_delta: This installs UCP's manifest + GEMINI.md + 15 UCP skills + secret-detection hook. (support 0.43) (support 0.57)
docs_delta: Implement Spree's checkout — the Order state machine (cart → address → (support 0.57)code_diff: @@ -0,0 +1,356 @@
+---
+name: spree-dev-patterns
+description: >
+ Cross-cutting Spree development patterns — the customization preference
+ hierarchy (Events > Webhooks > Dependencies > Decorators),
+ `Spree::Dependencies` service-object swapping, the `_decorator.rb` + `prepend`
+ + `self.prepended` idiom, idempotent subscribers and webhook receivers,
+ multi-store scoping discipline, prefixed IDs, calculator polymorphism
+ (shipping/promotion/tax share the base), service-object composition with
+ `dry-monads` or simple results, why to avoid `class_eval` reopening and
+ Deface, and Spree-on-Rails idioms (Hotwire/Turbo Stimulus, ActiveStorage,
+ Action Cable, Sidekiq). Use when designing the architecture of a Spree
+ extension or solving cross-cutting concerns.
+---
+
+# Spree Development Patterns
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/customization/decorators for the modern decorator pattern.
+2. Inspect `lib/spree/dependencies.rb` in the live `spree` gem for the current swappable-services registry.
+3. Read the Spree blog's developer posts for current best practices: https://spreecommerce.org/blog.
+4. For Rails idioms, cross-reference the Rails 7+ guides.
+5. Check the v5.4 announcement's AGENTS.md mention — Spree ships AI-coding rules.
+
+## Pattern: The Customization Hierarchy
+
+Always reach for the lowest-numbered tool that solves your problem:
+
+| Priority | Tool | When |
+|----------|------|------|
+| **1** | Event Subscriber | React to a domain change asynchronously |
+| **2** | Webhook | Notify an external system |
+| **3** | `Spree::Dependencies` swap | Change a service object's behavior |
+| **4** | Admin Navigation + Partials | Add UI to admin |
+| **5** | Decorator (`prepend`) | Last resort for model/controller customization |
+
+Higher numbers tie you tighter to Spree internals and break more often on upgrade.
+
+## Pattern: The Decorator Idiom
+
+```ruby
+# app/models/spree/product_decorator.rb
+module MyApp::ProductDecorator
+ def self.prepended(base)
+ # Class-level additions go here
+ base.has_many :reviews, class_name: 'MyApp::Review'
+ base.validates :seo_title, length: { maximum: 70 }, allow_nil: true
+ base.scope :featured, -> { where(featured: true) }
+ end
+
+ # Instance-method overrides — call `super` to preserve core behavior
+ def display_name
+ seo_title.presence || super
+ end
+end
+
+Spree::Product.prepend(MyApp::ProductDecorator) unless Spree::Product.include?(MyApp::ProductDecorator)
+```
+
+Three things to never forget:
+- File ends with `_decorator.rb`
+- `prepend`, not `include` (so `super` works)
+- Guard against double-prepend (the `unless` clause)
+
+## Pattern: `Spree::Dependencies` Service Swapping
+
+```ruby
+# config/initializers/spree.rb
+Spree::Dependencies.cart_add_item_service = MyApp::CartAddItemService
+Spree::Dependencies.shipping_rate_estimator = MyApp::CustomEstimator
+Spree::Dependencies.order_updater_class = MyApp::OrderUpdater
+```
+
+Your service must implement the **same public contract** as the one it replaces. Extend rather than rewrite:
+
+```ruby
+class MyApp::CartAddItemService < Spree::Cart::AddItem
+ def call(order:, variant:, quantity: 1, options: {})
+ result = super
+ apply_custom_logic(result, options)
+ result
+ end
+end
+```
+
+## Pattern: Idempotent Subscribers
+
+Events fire **at least once** in some failure modes (process restart mid-publish, retry). Make handlers idempotent:
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle
+
+ def handle(event)
+ order = event.order
+ # Idempotency key: order ID + state transition
+ return if AccountingSync.where(order_id: order.id).exists?
+
+ AccountingSync.create!(order: order, synced_at: Time.current)
+ AccountingApiClient.push(order)
+ end
+end
+```
+
+For webhook receivers, use the event's unique ID + a processed_events table.
+
+## Pattern: Multi-Store Scoping Discipline
+
+Every customer-facing query should scope by store:
+
+```ruby
+# Bad
+Spree::Product.active.featured
+
+# Good
+current_store.products.active.featured
+
+# In a service / job, pass store explicitly
+class MyApp::Service
+ def initialize(store:)
+ @store = store
+ end
+
+ def call
+ @store.orders.complete
+ end
+end
+```
+
+Code reviews should flag any query that uses a bare `Spree::Order.…` or `Spree::Product.…` in customer-facing code.
+
+## Pattern: Prefixed IDs (v5.4+)
+
+API v3 exposes prefixed IDs (`prod_…`, `ord_…`). Don't expose raw DB IDs to external clients. The model gives you both:
+
+```ruby
+order.id # 12345 (internal database ID)
+order.prefixed_id # "ord_01HXVZK..."
+```
+
+Treat prefixed IDs as opaque strings — sortable but otherwise meaningless to consumers.
+
+## Pattern: Calculator Polymorphism
+
+Spree's `Calculator` base class powers:
+- Shipping cost (`ShippingMethod#calculator`)
+- Promotion discounts (`PromotionAction#calculator`)
+- Tax rates (`TaxRate#calculator`)
+
+```ruby
+class MyApp::Calculator::PercentOver100 < Spree::Calculator
+ preference :percent, :decimal, default: 10
+
+ def self.description
+ 'Percent off when cart exceeds 100'
+ end
+
+ def compute(object)
+ return 0 if object.amount < 100
+ object.amount * (preferred_percent / 100.0) * -1
+ end
+end
+```
+
+Register where appropriate:
+
+```ruby
+Rails.application.config.spree.calculators.promotion_actions.create_adjustment << MyApp::Calculator::PercentOver100
+```
+
+## Pattern: Service-Object Composition
+
+Spree's service objects return either the result or raise. Common pattern:
+
+```ruby
+class MyApp::OrderProcessor
+ def initialize(order:)
+ @order = order
+ end
+
+ def call
+ enrich_metadata
+ notify_subscribers
+ @order
+ end
+
+ private
+
+ attr_reader :order
+
+ def enrich_metadata
+ order.metafields.find_or_create_by(namespace: 'my_app', key: 'processed_at') do |m|
+ m.value = Time.current.iso8601
+ end
+ end
+
+ def notify_subscribers
+ Spree::Bus.publish('my_app.order_processed', order: order)
+ end
+end
+```
+
+For functional-style result handling, integrate `dry-monads`:
+
+```ruby
+class MyApp::OrderProcessor
+ include Dry::Monads[:result]
+
+ def call(order:)
+ enriched = enrich_metadata(order)
+ return Failure(:enrichment_failed) if enriched.nil?
+ notify(order)
+ Success(order)
+ end
+end
+```
+
+Use whichever style your team is consistent on.
+
+## Pattern: Avoid `class_eval` Reopening
+
+```ruby
+# BAD
+Spree::Product.class_eval do
+ def display_name
+ seo_title.presence || name
+ end
+end
+```
+
+This breaks autoloading in development and has no override semantics for `super`. Use a decorator module + `prepend` instead.
+
+## Pattern: Avoid Deface in v5
+
+Deface was a CSS-selector view-override engine for the legacy ERB frontend. In v5:
+- Deface only works on ERB views — and v5 admin is Hotwire/Turbo with **partial slots** instead
+- Deface overrides are silently no-ops on missing virtual paths
+- The Page Builder + slot system replace Deface in modern Spree
+
+If you find yourself wanting Deface, ask:
+1. Can I use a partial slot? (Yes → use it)
+2. Can I customize via Page Builder section? (Yes → use it)
+3. Can I patch in the storefront repo? (Yes — for Next.js storefront customizations)
+
+## Pattern: Hotwire / Turbo / Stimulus
+
+Spree v5 admin is Hotwire-native. Conventions:
+
+- **Turbo Frames** for partial page updates (lazy-loaded panels)
+- **Turbo Streams** for server-driven DOM updates (after an action)
+- **Stimulus** controllers for client-side interactivity
+
+```javascript
+// app/javascript/controllers/order_quick_actions_controller.js
+import { Controller } from '@hotwired/stimulus';
+
+export default class extends Controller {
+ static targets = ['button'];
+
+ async refund(event) {
+ event.preventDefault();
+ const response = await fetch(this.buttonTarget.dataset.url, { method: 'POST', headers: this.headers() });
+ if (response.ok) this.buttonTarget.disabled = true;
+ }
+
+ headers() {
+ return {
+ 'X-CSRF-Token': document.querySelector('meta[name="csrf-token"]').content,
+ 'Accept': 'text/vnd.turbo-stream.html'
+ };
+ }
+}
+```
+
+```erb
+<div data-controller="order-quick-actions">
+ <%= button_to 'Refund', refund_order_path(order),
+ method: :post,
+ data: { 'order-quick-actions-target': 'button', action: 'order-quick-actions#refund' } %>
+</div>
+```
+
+## Pattern: Sidekiq for Anything Non-Trivial
+
+Anything that:
+- Hits an external API
+- Sends an email
+- Processes an image
+- Updates >100 records
+- Could take >100ms
+
+…belongs in a Sidekiq job, not a controller action.
+
+```ruby
+class MyApp::SyncToErpJob < ApplicationJob
+ queue_as :default
+
+ def perform(order_id)
+ order = Spree::Order.find(order_id)
+ ErpClient.upsert(order)
+ end
+end
+
+# Enqueue from a subscriber
+MyApp::SyncToErpJob.perform_later(order.id)
+```
+
+## Pattern: Don't Modify Core Files
+
+Never edit `vendor/bundle/.../spree/...`. Two reasons:
+1. Bundle install wipes your changes
+2. Upgrades become impossible
+
+Use decorators, dependencies, subscribers, and slots — that's why they exist.
+
+## Pattern: Versioning Your Extension
+
+```ruby
+# lib/spree_my_extension/version.rb
+module SpreeMyExtension
+ VERSION = '1.2.3'
+end
+```
+
+Tag releases, pin to Spree minor in gemspec:
+
+```ruby
+# spree_my_extension.gemspec
+spec.add_dependency 'spree', '>= 5.4', '< 6.0'
+```
+
+Test against multiple Spree minors in CI.
+
+## Pattern: Spree's AGENTS.md (v5.4+)
+
+v5.4 ships an `AGENTS.md` at the repo root — AI-coding rules for tools like Claude Code and Cursor. Read it when you adopt a new Spree version; it codifies the customization hierarchy and code-style conventions.
+
+## Anti-Pattern Roundup
+
+- **Decorating to add a feature you could subscribe to** → use events
+- **Class-reopening with `class_eval`** → use `prepend` decorator
+- **Modifying Order totals manually** → use `Spree::OrderUpdater`
+- **Storing API keys in browser code** → use httpOnly cookies + server actions
+- **Skipping multi-store scoping** → leak attack
+- **Ignoring `Spree::Dependencies` in favor of decorators** → tight coupling
+- **Custom admin views instead of partial slots** → upgrade pain
+- **Using Deface in v5** → silent no-op
+- **Adding `spree_auth_devise` to a new v5 project** → archived gem
+- **Building features in controllers instead of service objects** → untestable
+
+---
+
+Always read `AGENTS.md` (v5.4+) and the latest customization docs before designing a non-trivial extension. The patterns evolve; what was idiomatic in v4 is wrong in v5. (support 0.57)code_diff: @@ -0,0 +1,224 @@
+# spree-commerce Rules
+
+## spree-expert
+
+Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 + legacy JSON:API v2 via `spree_legacy_api_v2`), the Order/Payment/Shipment state machines, Extensions as Rails engines, the `prepend` Decorator pattern, the Spree Event Bus + Webhooks 2.0, Promotions (rules/actions/calculators), Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace module, the Next.js 16 headless storefront, `@spree/sdk` TypeScript SDK with Zod, RSpec + `spree_dev_tools` testing, and PostgreSQL/Redis/Sidekiq/Docker deployment. Use PROACTIVELY when the user is installing Spree, building Spree extensions, customizing the admin, calling Spree APIs, integrating payment gateways, building a headless storefront, or deploying Spree to production. Always fetches the latest documentation and release notes before writing code.
+
+You are an expert in Spree Commerce — the open-source Rails e-commerce platform created by Sean Schofield in 2007, shepherded today by Spark Solutions / Vendo, and used by Bookshop, Bonobos, GoDaddy, Huckberry, KFC, Blue Apron, the New England Patriots, and 5,000+ businesses. You help build production-grade Spree implementations and extensions across both the Rails backend and the Next.js storefront.
+
+# IMPORTANT: Live Documentation Rule
+
+Spree is actively evolving — v5.0 (Apr 2025) brought a complete admin rewrite to Tailwind+Hotwire and a headless Next.js storefront; v5.2 added the CLI and Admin SDK; v5.4 (Apr 2026) introduced API v3 (flat JSON, prefixed IDs, OpenAPI 3.0), Payment Sessions, Markets, and `@spree/sdk`. The model graph, gem layout, and recommended patterns shift between minors. Before writing any implementation code:
+
+1. **Always web-search** for the latest release notes on github.com/spree/spree/releases before coding.
+2. **Always fetch live docs** from the official sources below for exact API paths, OAuth scopes, generator commands, and event names.
+3. **Never assume** a model field, controller path, or service-object name is current — verify against the live spec or source first.
+4. **Cite the Spree version** you are coding against in comments (e.g., `# Spree 5.4.x`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Main docs index | https://spreecommerce.org/docs/ | Versioned doc root |
+| Docs URL map (llms.txt) | https://spreecommerce.org/docs/llms.txt | Machine-readable index of every doc page |
+| Architecture overview | https://spreecommerce.org/docs/developer/core-concepts/architecture | Engine/package layout |
+| Orders core concept | https://spreecommerce.org/docs/developer/core-concepts/orders | Order/Payment/Shipment states |
+| Payments core concept | https://spreecommerce.org/docs/developer/core-concepts/payments | Payment Sessions, gateway model |
+| Promotions | https://spreecommerce.org/docs/developer/core-concepts/promotions | Rules/Actions/Calculators |
+| Events | https://spreecommerce.org/docs/developer/core-concepts/events | Event bus, `Spree::Subscriber` |
+| Webhooks | https://spreecommerce.org/docs/developer/core-concepts/webhooks | Webhooks 2.0, HMAC signing |
+| Metafields | https://spreecommerce.org/docs/developer/core-concepts/metafields | Custom data on any model |
+| Translations | https://spreecommerce.org/docs/developer/core-concepts/translations | i18n, Translations Center |
+| Decorators (modern) | https://spreecommerce.org/docs/developer/customization/decorators | `prepend` pattern, generators |
+| Deface (legacy v4) | https://spreecommerce.org/docs/developer/customization/v4/deface | Deprecated view override engine |
+| Admin Navigation | https://spreecommerce.org/docs/developer/admin/navigation | `Spree.admin.navigation` API |
+| API reference index | https://spreecommerce.org/docs/api-reference | Store API + Admin API v3 |
+| Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend |
+| TypeScript SDK quickstart | https://spreecommerce.org/docs/developer/sdk/quickstart | `@spree/sdk` |
+| CLI quickstart | https://spreecommerce.org/docs/developer/cli/quickstart | `create-spree-app` |
+| Testing tutorial | https://spreecommerce.org/docs/developer/tutorial/testing | RSpec/FactoryBot/Capybara |
+| Deployment (database) | https://spreecommerce.org/docs/developer/deployment/database | PG/MySQL/Redis |
+| Upgrade guide | https://spreecommerce.org/docs/developer/upgrades/quickstart | Version-to-version migration |
+| Multi-store use case | https://spreecommerce.org/docs/use-case/multi-store/model | One backend, many stores |
+| Marketplace use case | https://spreecommerce.org/docs/use-case/marketplace/model | Multi-vendor |
+| B2B use case | https://spreecommerce.org/docs/use-case/b2b/b2b-commerce-model | B2B catalog/pricing |
+| Multi-tenant use case | https://spreecommerce.org/docs/use-case/multi-tenant/multi-tenant-model | SaaS pattern |
+| Main repo | https://github.com/spree/spree | Source + releases |
+| Releases page | https://github.com/spree/spree/releases | Changelog |
+| spree-starter | https://github.com/spree/spree-starter | Rails backend starter |
+| Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront |
+| spree_stripe | https://github.com/spree/spree_stripe | Stripe + Connect integration |
+| spree_adyen | https://github.com/spree/spree_adyen | Adyen integration |
+| spree_paypal_checkout | https://github.com/spree/spree_paypal_checkout | PayPal Checkout |
+| spree_klaviyo | https://github.com/spree/spree_klaviyo | Marketing integration |
+| spree_legacy_api_v2 | https://github.com/spree/spree_legacy_api_v2 | Backport of v2 API |
+| spree_i18n | https://github.com/spree-contrib/spree_i18n | Locale packs |
+| Deface gem | https://github.com/spree/deface | View override engine (legacy) |
+| Org page | https://github.com/spree | All official repos |
+| Marketing site | https://spreecommerce.org | Positioning, customers, blog |
+| v5.0 announcement | https://spreecommerce.org/announcing-spree-5-the-biggest-open-source-release-ever/ | Major release notes |
+| v5.2 announcement | https://spreecommerce.org/announcing-spree-5-2/ | CLI, generators, Tailwind 4 |
+| v5.4 announcement | https://spreecommerce.org/announcing-spree-commerce-5-4/ | API v3, SDK, storefront |
+
+## Search Patterns
+
+- `site:spreecommerce.org/docs <topic>` — official doc lookup
+- `site:github.com/spree/spree <release-tag>` — release-specific source
+- `spree v5 admin navigation api` — admin extensibility
+- `spree event bus subscriber order.completed` — event names
+- `spree api v3 store admin openapi` — API v3 contract
+- `spree_legacy_api_v2 doorkeeper json:api` — v2 API
+- `spree decorator prepend self.prepended` — modern decorators
+- `spree payment session stripe adyen` — v5.4 payment flow
+- `spree markets multi-currency region` — Markets feature
+- `@spree/sdk zod typescript next.js` — SDK usage
+
+# Spree Conceptual Architecture
+
+## What Spree Is in 2026
+
+Open-source headless e-commerce on Rails 7+, BSD-3-Clause. Powers B2C, B2B, marketplaces, multi-vendor, multi-tenant SaaS, and cross-border commerce. Spree 5 separates **Community Edition** (free, BSD-3) from **Enterprise Edition** (commercial: B2B, marketplace, multi-tenant modules).
+
+## v5 Gem Layout (consolidated)
+
+In v5, the umbrella **`spree` gem** ships models, business logic, both REST APIs (Store + Admin), and webhooks. Optional add-ons:
+- **`spree_admin`** — the Tailwind/Hotwire admin dashboard (built and open-sourced by Vendo)
+- **`spree_emails`** — transactional email templates
+- **`spree_legacy_api_v2`** — JSON:API v2 backport for apps still on v2
+- **`spree_i18n`** — locale packs
+
+The legacy multi-engine split (`spree_core` / `spree_api` / `spree_backend` / `spree_frontend` / `spree_storefront_api_v2` / `spree_platform_api`) has collapsed into the consolidated `spree` gem. The legacy ERB **`spree_frontend` is removed** — modern storefronts use either the Next.js storefront repo or `spree-rails-storefront` (Hotwire/Stimulus/Tailwind page-builder).
+
+## Four Customization Surfaces (in preference order)
+
+1. **Events + Webhooks** — react to `Spree::Event` publications via `Spree::Subscriber` or HMAC-signed webhook endpoints.
+2. **Dependencies** — swap services via `Spree::Dependencies.foo_service = MyService` (e.g., `Stock::Estimator`, `OrderUpdater`, `TaxCalculator`).
+3. **Admin Navigation + Partials** — declarative `Spree.admin.navigation` API + `store_nav_partials`, `store_products_nav_partials`, etc.
+4. **Decorators (last resort)** — `app/models/spree/foo_decorator.rb` using `Spree::Foo.prepend(MyApp::FooDecorator)`. Tightly couples to internals; breaks on upgrades.
+
+Deface is **deprecated in v5** — it only ever targeted the now-removed legacy ERB frontend.
+
+## Data Model Highlights
+
+- **Catalog**: `Product`, `Variant`, `OptionType`, `OptionValue`, `Property`, `Taxonomy`, `Taxon`, `Image`, `Metafield` (v5+).
+- **Pricing**: `Price`, `PriceList` (v5.3+ for customer/segment overrides), `Calculator`.
+- **Order graph**: `Order`, `LineItem`, `Adjustment`, `Shipment`, `InventoryUnit`, `Payment`, `PaymentMethod`, `PaymentSession` (v5.4+), `Refund`, `Reimbursement`, `ReturnAuthorization`, `CustomerReturn`.
+- **Inventory**: `StockLocation`, `StockItem`, `StockMovement`, `StockTransfer`.
+- **Shipping**: `ShippingMethod`, `ShippingRate`, `ShippingCategory`, `Zone`, `ZoneMember`.
+- **Promotions**: `Promotion`, `PromotionRule`, `PromotionAction`, `PromotionCategory`, `CouponCode`.
+- **Identity**: `User`, `Role`, `Address`, `StoreCredit`, `GiftCard`, `CustomerGroup`, `Invitation`, `ApiKey`.
+- **Taxes**: `TaxCategory`, `TaxRate`.
+- **Multi-store/region**: `Store`, `Market` (v5.4+ — currency+locale+payment+shipping per region), `CmsPage`, `Theme`.
+
+## Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+```
+
+`payment` step is skipped if the order is fully covered by store credit / gift cards. Sub-state machines:
+
+- **`Order#payment_state`** — `balance_due` / `paid` / `credit_owed` / `failed` / `void`
+- **`Order#shipment_state`** — `pending` / `ready` / `partial` / `shipped` / `backorder` / `canceled`
+- **`Shipment#state`** — `pending` → `ready` → `shipped` (+ `canceled`)
+- **`Payment#state`** — `checkout` → `processing` → `pending` → `completed` (+ `failed`, `void`, `invalid`)
+- **Returns** — `ReturnAuthorization` (`authorized`/`canceled`) → `CustomerReturn` → `Reimbursement` (`pending`/`reimbursed`/`errored`) → `Refund`
+
+## API Surfaces
+
+Spree maintains two generations side-by-side:
+
+### API v3 (v5.4+, recommended)
+
+Two REST APIs under `/api/v3/`:
+
+| API | Path | Auth | Audience |
+|-----|------|------|----------|
+| **Store API** | `/api/v3/store/*` | Publishable key (`pk_…`) + per-user JWT | Customers / storefronts |
+| **Admin API** | `/api/v3/admin/*` | Per-user API keys + OAuth2 (Doorkeeper) | Admin/operations |
+
+Style: **flat JSON** (Stripe-like) with `?expand=`/`?include=` parameters, **prefixed IDs** (`prod_…`, `ord_…`, `var_…`), per-route rate-limiting, **OpenAPI 3.0** spec published per release. ~10× faster than v2.
+
+### API v2 (legacy, deprecated)
+
+JSON:API-style endpoints — `/api/v2/storefront/*` and `/api/v2/platform/*`. Doorkeeper OAuth2 with `client_credentials` grant + `admin` scope for Platform; password grant + publishable token for Storefront. Available in v5+ via the **`spree_legacy_api_v2`** gem for migration windows. New work should target API v3.
+
+## The Spree Event Bus
+
+`Spree::Events` is Spree's first-class pub/sub — the canonical replacement for ActiveSupport::Notifications-based callbacks.
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle_completed
+
+ def handle_completed(event)
+ Order = event.order
+ # ...
+ end
+end
+```
+
+Wildcards (`order.*`, `*.created`, `*`) supported. Subscribers in `app/subscribers/` auto-register. Webhooks 2.0 piggybacks on the event bus: events feed `WebhookEventSubscriber`, which fires HMAC-SHA256-signed (`X-Spree-Webhook-Signature`) POSTs with exponential backoff up to 5 retries.
+
+Canonical events: `order.created/.updated/.completed/.canceled/.resumed/.paid/.shipped`, `payment.created/.updated/.paid`, `shipment.created/.updated/.shipped/.canceled/.resumed`, `product.activate/.archive/.out_of_stock/.back_in_stock`, plus lifecycle events (`{model}.created/.updated/.deleted`) from `publishes_lifecycle_events`.
+
+## Admin Dashboard (v5)
+
+Tailwind 4 + Hotwire/Turbo/Stimulus. The old Bootstrap `spree_backend` is archived. Extensibility:
+- `Spree.admin.navigation` declarative API for menu items (v5.2+)
+- Partial injection points: `store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`
+- Admin SDK (v5.2+) — components + form builder
+- Theme / Page Builder for no-code storefront editing
+- Pluggable custom reports
+
+## Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` + resulting `Adjustment`s.
+- **Rules**: `FirstOrder`, `ItemTotal`, `Product`, `Taxon`, `User`, `UserLoggedIn`, `OneUsePerUser`, `Country`, `Currency`, `OptionValue`, `CustomerGroup`
+- **Actions**: `CreateAdjustment` (order-level), `CreateItemAdjustments` (line-item), `FreeShipping`, `CreateLineItems` (auto-add-gift)
+- Match policy: "all" vs "any". Coupon batches with CSV export (v5.0). Rule-based promotions engine (v5.1).
+
+## Multi-store, Markets, Marketplace
+
+- **Multi-store** is core, not an add-on. One install → many `Store` records, each with own domain/theme/policies/integrations. **Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets. **Per-store**: orders, payments, refunds, store credits, gift cards, themes.
+- **Markets** (v5.4+) bundle currency/locale/payment/shipping per region. URL patterns like `/us/en/`, `/de/de/`.
+- **Marketplace** is an official Enterprise Edition module — vendors, commission, payouts (Stripe Connect via `spree_stripe`).
+- **Multi-tenant** is Enterprise-only.
+
+## Headless Storefront (Next.js)
+
+[github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: MeiliSearch faceted catalog, color swatches, one-page checkout, guest checkout, multi-shipment, coupons, gift cards, Apple/Google Pay, Klarna, Affirm, SEPA, multi-region routing, GA4 + JSON-LD SEO. Deployable to Vercel or Docker.
+
+Distinct from **`spree-starter`** (the Rails *backend* starter).
+
+## Critical Gotchas
+
+- **Use events / webhooks / dependencies before reaching for decorators.** Decorators are explicitly "a last resort" in current Spree docs.
+- **When you decorate, use `prepend` (not `class_eval` reopen).** File suffix `_decorator.rb`, module pattern, `self.prepended(base)` for class-level additions. Use `bin/rails g spree:model_decorator` generator.
+- **Don't decorate controllers to override actions** — emit events or add sibling controllers instead.
+- **Deface is dead in v5.** It only ever worked on the now-removed legacy ERB frontend.
+- **`spree_auth_devise` is deprecated and the repo is archived (Feb 2026).** v5 ships Devise auth in-core; do not add the old gem to a new project.
+- **Storefront API v2 and Platform API v2 are deprecated** but supported via the `spree_legacy_api_v2` gem during migration.
+- **v5 admin is Tailwind + Hotwire.** v4 was Bootstrap. Use `Spree.admin.navigation` and partial slots, not CSS hacks.
+- **Multi-store leak risk**: always scope queries by `current_store` — naive `Order.all` crosses stores.
+- **For multi-vendor in v5, prefer the Enterprise marketplace module** over the community `spree_multi_vendor` gem.
+- **Background jobs and webhooks require Sidekiq + Redis** — webhook 2.0 retries via Sidekiq.
+- **Use `@spree/sdk` from server-side Next.js only** — never expose API keys to the browser.
+- **OpenAPI specs are versioned per Spree release** — pin generated TS clients to the deployed Spree version.
+- **Markets > raw per-store currencies.** v5.4+ configures currencies/locales/payment/shipping per region via `Market` records.
+
+# Your Implementation Workflow
+
+When helping the user implement Spree:
+
+1. **Identify the version** they're on. v5.4+ → API v3 + Payment Sessions + Markets + `@spree/sdk`. v5.0–5.3 → API v2 + JSON:API. v4 → upgrade path is its own conversation.
+2. **Identify the surface**: Rails backend extension, admin customization, API consumer, headless storefront, or full-stack deployment?
+3. **Web-search the latest release notes** before writing code — Spree's minor releases land features that change recommended patterns.
+4. **Prefer events / webhooks / dependencies** over decorators when designing extensions.
+5. **For API work, choose v3 for new projects** and use `spree_legacy_api_v2` only for live v2 clients during migration windows.
+6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
+7. **For deployment, plan for PostgreSQL + Redis + Sidekiq + S3** minimum; Docker images are published per release to GHCR.
+8. **Cite the Spree version** you coded against in comments.
+9. **Never hardcode** an endpoint path, event name, or service-object name without verifying it in the live docs.
+ (support 0.86)code_diff: @@ -0,0 +1,148 @@
+{
+ "name": "spree-commerce",
+ "displayName": "Spree Commerce",
+ "version": "1.0.0",
+ "description": "Spree Commerce expert for building open-source Rails e-commerce — covers the v5+ architecture (consolidated `spree` umbrella gem, Tailwind admin dashboard, API v3 flat-JSON + OpenAPI), Order/Payment/Shipment state machines, Extensions and Decorators (prepend), the Event Bus + Webhooks 2.0, Promotions engine, Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace, the Next.js headless storefront, `@spree/sdk` TypeScript SDK, RSpec testing with `spree_dev_tools`, and Docker/PostgreSQL/Redis/Sidekiq deployment.",
+ "publisher": "orcaqubits-ai",
+ "author": {
+ "name": "Rohit Bajaj, Julekha Khatun",
+ "url": "https://orcaqubits-ai.com"
+ },
+ "repository": {
+ "type": "git",
+ "url": "https://github.com/AgenticCommerce/agentic-commerce-claude-plugins"
+ },
+ "keywords": [
+ "spree",
+ "spree-commerce",
+ "ecommerce",
+ "rails",
+ "ruby",
+ "headless-commerce",
+ "open-source",
+ "postgresql",
+ "sidekiq",
+ "nextjs",
+ "tailwind",
+ "hotwire",
+ "stripe",
+ "marketplace",
+ "multi-store"
+ ],
+ "categories": [
+ "AI",
+ "Other"
+ ],
+ "skills": [
+ {
+ "name": "spree-admin-customization",
+ "description": "Customize the Spree v5 Admin Dashboard — Tailwind 4 + Hotwire/Turbo/Stimulus stack, the `Spree.admin.navigation` declarative API (v5.2+) for menu items, partial injection slots (`store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`), the Admin SDK components + form builder, custom dashboard reports, the Page Builder for storefront editing, and theme management. Use when adding admin pages, injecting UI into existing screens, or building admin extensions.",
+ "path": ".agent/skills/spree-admin-customization/SKILL.md"
+ },
+ {
+ "name": "spree-api-v3",
+ "description": "Build with Spree's v3 APIs (v5.4+) — Store API at `/api/v3/store/*` (publishable key + per-user JWT, customer-facing) and Admin API at `/api/v3/admin/*` (per-user API keys + OAuth2 Doorkeeper, admin/operations). Covers the flat-JSON Stripe-like envelope, `?expand=` / `?include=` parameters, prefixed IDs (`prod_…`, `ord_…`), OpenAPI 3.0 spec, rate limiting, idempotency, and migration from v2 JSON:API. Use when building API clients, SDKs, or extending API endpoints in a Spree v5.4+ deployment.",
+ "path": ".agent/skills/spree-api-v3/SKILL.md"
+ },
+ {
+ "name": "spree-catalog",
+ "description": "Build and customize Spree's catalog — Products with Variants and OptionTypes/OptionValues, Taxonomies and Taxons (nested set), Properties, Images via ActiveStorage, multi-currency Prices, the v5.3+ PriceList feature for customer/segment overrides, MeiliSearch faceted search (v5.4+), product archiving/activation, CSV import/export, and SEO. Use when modeling products, customizing the catalog UI, indexing search, or importing inventory.",
+ "path": ".agent/skills/spree-catalog/SKILL.md"
+ },
+ {
+ "name": "spree-checkout",
+ "description": "Implement Spree's checkout — the Order state machine (cart → address → delivery → payment → confirm → complete), the Payment and Shipment sub-state machines, the return flow (ReturnAuthorization → CustomerReturn → Reimbursement → Refund), guest checkout, payment-step skipping for credit-covered orders, and the V3 checkout API surface. Use when building or customizing checkout flows, debugging state transitions, or wiring custom checkout steps.",
+ "path": ".agent/skills/spree-checkout/SKILL.md"
+ },
+ {
+ "name": "spree-data-model",
+ "description": "Navigate Spree's canonical data model — the Catalog (Product/Variant/OptionType/Taxon/Property/Metafield), Pricing (Price/PriceList), Order graph (Order/LineItem/Adjustment/Shipment/Payment/PaymentSession/Refund/Reimbursement), Inventory (StockLocation/StockItem/StockMovement), Shipping (ShippingMethod/Zone), Promotions, Identity (User/Role/Address/StoreCredit/GiftCard), Taxes, and the v5.4+ Markets + Store multi-region model. Use when designing a feature that touches Spree models, writing decorators, or building admin/storefront UIs.",
+ "path": ".agent/skills/spree-data-model/SKILL.md"
+ },
+ {
+ "name": "spree-deployment",
+ "description": "Deploy Spree to production — PostgreSQL + Redis + Sidekiq stack, Docker multi-arch images on GHCR, the `spree-starter` Dockerfile + Compose, Heroku/Render/Fly.io/AWS targets, env-var conventions, RAILS_MASTER_KEY, asset precompilation (Tailwind 4 + Propshaft), Action Cable, MeiliSearch indexing, S3 / ActiveStorage for media, log/observability setup, zero-downtime deploys, and migration strategy. Use when going from local dev to production, scaling Spree, or troubleshooting deploys.",
+ "path": ".agent/skills/spree-deployment/SKILL.md"
+ },
+ {
+ "name": "spree-dev-patterns",
+ "description": "Cross-cutting Spree development patterns — the customization preference hierarchy (Events > Webhooks > Dependencies > Decorators), `Spree::Dependencies` service-object swapping, the `_decorator.rb` + `prepend` + `self.prepended` idiom, idempotent subscribers and webhook receivers, multi-store scoping discipline, prefixed IDs, calculator polymorphism (shipping/promotion/tax share the base), service-object composition with `dry-monads` or simple results, why to avoid `class_eval` reopening and Deface, and Spree-on-Rails idioms (Hotwire/Turbo Stimulus, ActiveStorage, Action Cable, Sidekiq). Use when designing the architecture of a Spree extension or solving cross-cutting concerns.",
+ "path": ".agent/skills/spree-dev-patterns/SKILL.md"
+ },
+ {
+ "name": "spree-events-webhooks",
+ "description": "Build with Spree's event bus and Webhooks 2.0 — `Spree::Events` publication, `Spree::Subscriber` DSL with `subscribes_to` and `on`, wildcard matching, lifecycle events (`{model}.created/.updated/.deleted` via `publishes_lifecycle_events`), the canonical event catalog (order.*, payment.*, shipment.*, product.*), Webhooks 2.0 endpoints, HMAC-SHA256 signing (`X-Spree-Webhook-Signature`), exponential-backoff retries, and Sidekiq job orchestration. Use when wiring event-driven business logic, building webhook consumers, or replacing ActiveSupport callback chains.",
+ "path": ".agent/skills/spree-events-webhooks/SKILL.md"
+ },
+ {
+ "name": "spree-extensions",
+ "description": "Build Spree extensions as Rails engines — gem scaffolding, `bin/rails g spree:extension`, mounting routes/migrations/assets, the modern `prepend` decorator pattern (`*_decorator.rb` with `self.prepended(base)`), generators (`spree:model_decorator`, `spree:controller_decorator`), the four customization surfaces in preference order (Events > Webhooks > Dependencies > Decorators), Spree::Dependencies for swapping service objects, gem release/versioning, and the deprecated Deface engine. Use when building a reusable Spree extension or adding non-trivial customization to an app.",
+ "path": ".agent/skills/spree-extensions/SKILL.md"
+ },
+ {
+ "name": "spree-headless-storefront",
+ "description": "Build with Spree's headless Next.js storefront — the official `spree/storefront` repo (Next.js 16 App Router with Server Actions and Turbopack, React 19 Server Components, Tailwind CSS 4, TypeScript 5, `@spree/sdk`, Sentry), server-only auth (httpOnly JWT cookies + publishable key), MeiliSearch faceted catalog, one-page checkout with Apple/Google Pay/Klarna/Affirm/SEPA, multi-region market routing, GA4 + JSON-LD SEO, and Vercel/Docker deployment. Use when forking or customizing the storefront, or evaluating headless adoption.",
+ "path": ".agent/skills/spree-headless-storefront/SKILL.md"
+ },
+ {
+ "name": "spree-i18n",
+ "description": "Localize a Spree application — the `spree_i18n` gem with 60+ locale packs, the v5.4+ Translations Center for product/CMS content (CSV import/export), Rails i18n basics applied to Spree (translation files, locale switching, pluralization, interpolation), per-Market locale routing in the headless storefront, RTL languages, and translating extensions. Use when localizing a Spree store, adding a new locale, or building i18n-aware extensions.",
+ "path": ".agent/skills/spree-i18n/SKILL.md"
+ },
+ {
+ "name": "spree-legacy-api-v2",
+ "description": "Work with Spree's legacy v2 APIs — JSON:API-style Storefront API at `/api/v2/storefront/*` and Platform API at `/api/v2/platform/*`, Doorkeeper OAuth2 (password grant for storefront, client_credentials + admin scope for platform), the `spree_legacy_api_v2` gem (required in v5+ for backward compatibility), and migration patterns to API v3. Use when maintaining a v2 client during a migration window, integrating an older partner system, or deciding when to cut over to v3.",
+ "path": ".agent/skills/spree-legacy-api-v2/SKILL.md"
+ },
+ {
+ "name": "spree-multi-store",
+ "description": "Configure Spree for multi-store and multi-region commerce — one Rails install running many `Store` records, the v5.4+ `Market` model (currency + locale + payment methods + shipping per region), what's shared vs per-store (products+inventory+customers shared; orders+payments+themes per-store), the Marketplace module (Enterprise — vendors/commission/payouts via Stripe Connect), and the Multi-tenant SaaS model. Use when planning a multi-brand or multi-region Spree deployment.",
+ "path": ".agent/skills/spree-multi-store/SKILL.md"
+ },
+ {
+ "name": "spree-payments",
+ "description": "Integrate payment gateways with Spree — PaymentMethod model, the v5.4+ PaymentSession provider-agnostic checkout flow, Stripe via `spree_stripe` (Apple/Google Pay, Link, Connect for marketplaces), Adyen via `spree_adyen`, PayPal via `spree_paypal_checkout`, StoreCredit / GiftCard as payment methods, refunds, payment state machine, and authoring a custom gateway. Use when wiring a payment integration, handling webhooks from a gateway, or debugging payment-state issues.",
+ "path": ".agent/skills/spree-payments/SKILL.md"
+ },
+ {
+ "name": "spree-performance",
+ "description": "Profile and optimize a Spree application — N+1 queries with bullet/scout, database indexing strategy for Spree's polymorphic associations, Rails fragment + Russian doll caching, ActiveStorage variant pre-generation, Sidekiq queue tuning, MeiliSearch vs Postgres FTS tradeoffs, Puma worker/thread sizing, CDN strategy for catalog pages, asset precompile time, and load testing. Use when Spree is slow, the database is hot, or you're preparing for a traffic spike (Black Friday, launch).",
+ "path": ".agent/skills/spree-performance/SKILL.md"
+ },
+ {
+ "name": "spree-promotions",
+ "description": "Build and customize Spree's promotions engine — Promotion + PromotionRule + PromotionAction + CouponCode + Adjustment, the bundled rules (FirstOrder/ItemTotal/Product/Taxon/User/OneUsePerUser/Country/CustomerGroup/etc.), bundled actions (CreateAdjustment/CreateItemAdjustments/FreeShipping/CreateLineItems), Calculator classes, coupon batches with CSV export, the v5.1+ advanced rule-based engine, and authoring custom rules/actions/calculators. Use when modeling promotions, building discount UIs, or extending the promotions engine.",
+ "path": ".agent/skills/spree-promotions/SKILL.md"
+ },
+ {
+ "name": "spree-security",
+ "description": "Secure a Spree deployment — Rails credentials and env-var hygiene, Devise auth (Spree v5 ships it in-core; `spree_auth_devise` is archived), CanCanCan authorization rules, Doorkeeper OAuth2 scopes, Storefront publishable key vs admin API key, webhook HMAC verification, OWASP Top 10 for Rails (mass assignment, CSRF, SQL injection via Ransack, XSS, IDOR through prefixed IDs), PCI scope (Spree never touches raw cards thanks to gateway tokenization), and multi-store data isolation. Use when auditing a Spree app, hardening a deploy, or addressing a security incident.",
+ "path": ".agent/skills/spree-security/SKILL.md"
+ },
+ {
+ "name": "spree-setup",
+ "description": "Bootstrap a new Spree project — `create-spree-app` CLI (v5.2+), `spree-starter` Rails backend, the Next.js storefront repo, `bin/rails g spree:install`, sample data, Docker Compose, and the PostgreSQL + Redis + Sidekiq prerequisites. Use when starting a new Spree project from scratch or onboarding an existing repo.",
+ "path": ".agent/skills/spree-setup/SKILL.md"
+ },
+ {
+ "name": "spree-shipping-fulfillment",
+ "description": "Build and customize Spree's shipping and fulfillment — ShippingMethod, ShippingCategory, Zone/ZoneMember, ShippingRate, the Stock::Estimator service, StockLocation/StockItem/StockMovement, multi-shipment orders, ShippingCalculator classes (FlatRate, FlatPercentItemTotal, PerItem, FlexiRate), shipment state machine, returns (ReturnAuthorization → CustomerReturn → Reimbursement → Refund), and integrating carrier APIs (UPS, FedEx, ShipStation). Use when configuring shipping rules, building fulfillment integrations, or debugging shipping-rate calculations.",
+ "path": ".agent/skills/spree-shipping-fulfillment/SKILL.md"
+ },
+ {
+ "name": "spree-testing",
+ "description": "Test Spree applications and extensions with RSpec — `spree_dev_tools` gem (v5.2+) for factories and helpers, FactoryBot patterns (prefer `build` over `create`), Capybara feature specs, controller/request specs, testing decorators and subscribers, dummy app for extension testing, system specs for the Hotwire admin, and CI patterns. Use when writing Spree tests, setting up CI, or refactoring slow specs.",
+ "path": ".agent/skills/spree-testing/SKILL.md"
+ },
+ {
+ "name": "spree-typescript-sdk",
+ "description": "Build storefronts and integrations using `@spree/sdk` — the official TypeScript SDK for Spree's API v3 (v5.4+). Covers installation, the resource-builder pattern (`spree.products.list`, `spree.checkout.create`, etc.), Zod schema validation, server-only auth (httpOnly JWTs, never exposing API keys), error handling, typing customizations, and pinning SDK versions to backend Spree releases. Use when integrating Spree into a Next.js / Node.js / TypeScript project.",
+ "path": ".agent/skills/spree-typescript-sdk/SKILL.md"
+ },
+ {
+ "name": "spree-upgrades",
+ "description": "Upgrade a Spree application — version-to-version migration paths (v4 → v5 is a major rewrite; v5.x → v5.y are simpler), Gemfile pinning strategy, decorator brittleness across versions, deprecated gems to remove (`spree_auth_devise`, `deface`, `spree_backend`), API v2 → v3 migration via `spree_legacy_api_v2`, admin Bootstrap → Tailwind transition, the upgrade guide workflow, and rollback strategy. Use when planning a Spree upgrade or auditing technical debt blocking one.",
+ "path": ".agent/skills/spree-upgrades/SKILL.md"
+ }
+ ]
+} (support 0.71)code_diff: @@ -0,0 +1,223 @@
+---
+name: spree-payments
+description: >
+ Integrate payment gateways with Spree — PaymentMethod model, the v5.4+
+ PaymentSession provider-agnostic checkout flow, Stripe via `spree_stripe`
+ (Apple/Google Pay, Link, Connect for marketplaces), Adyen via `spree_adyen`,
+ PayPal via `spree_paypal_checkout`, StoreCredit / GiftCard as payment methods,
+ refunds, payment state machine, and authoring a custom gateway. Use when
+ wiring a payment integration, handling webhooks from a gateway, or debugging
+ payment-state issues.
+---
+
+# Spree Payments
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/core-concepts/payments for the Payment + PaymentSession model.
+2. Fetch the integration repo README — https://github.com/spree/spree_stripe / spree_adyen / spree_paypal_checkout — for current install + config.
+3. Check the gateway's own SDK docs (Stripe / Adyen / PayPal) for the latest API version.
+4. Inspect the live `Spree::Payment` source for state transitions and column names.
+5. Check the v5.4 announcement for the PaymentSession introduction.
+
+## Conceptual Architecture
+
+### PaymentMethod, Payment, PaymentSession
+
+| Model | Purpose |
+|-------|---------|
+| **`PaymentMethod`** | Admin-configured way to pay (Stripe, Adyen, PayPal, StoreCredit, etc.). Per-store, per-currency. |
+| **`Payment`** | A specific payment attempt on an Order. Has a `state`, a `source` (CreditCard/StoreCredit/...), and an `amount`. |
+| **`PaymentSession`** (v5.4+) | Provider-agnostic envelope around a payment authorization. Wraps Stripe Payment Intents, Adyen sessions, PayPal orders. |
+
+### Payment State Machine
+
+```
+checkout → processing → pending → completed
+ ↓
+ failed | void | invalid
+```
+
+- **`checkout`** — initialized, waiting for capture
+- **`processing`** — sent to gateway
+- **`pending`** — gateway accepted, awaiting async confirmation (3DS, ACH)
+- **`completed`** — captured
+- **`failed`** — declined
+- **`void`** — voided pre-capture
+- **`invalid`** — gateway returned an unparseable response
+
+### Payment Sources
+
+Most `Payment` rows have a polymorphic `source`:
+- `Spree::CreditCard` — tokenized card data
+- `Spree::StoreCredit` — user's store credit balance
+- `Spree::GiftCard` — gift card balance
+- Gateway-specific (`Spree::PayPalCheckout::Order`, etc.)
+
+### The v5.4 PaymentSession Flow
+
+1. Storefront calls `POST /api/v3/store/checkout/payment_sessions` with `payment_method_id`.
+2. Spree creates a `PaymentSession`, hits the gateway's session API (Stripe Payment Intent, Adyen `/sessions`, PayPal `/v2/orders`).
+3. Storefront renders the gateway's hosted UI (Stripe Elements, Adyen Drop-in, PayPal Buttons) with the returned client secret / session data.
+4. User authorizes (handles 3DS, SCA, Apple/Google Pay).
+5. Storefront calls `POST /api/v3/store/checkout/complete`.
+6. Spree captures the session into a `Payment` and advances the order.
+
+Provider differences are hidden behind the `PaymentSession` envelope — the storefront code is gateway-agnostic above the UI layer.
+
+### Stripe via spree_stripe
+
+- One-click installer in admin (Settings → Payment Methods → Stripe → Connect)
+- Supports cards, Apple Pay, Google Pay, Link, Klarna, Affirm, SEPA
+- **Stripe Connect** for marketplace payouts (Enterprise marketplace)
+- Webhooks: `payment_intent.succeeded`, `payment_intent.payment_failed`, etc. routed to `/webhooks/stripe`
+
+### Adyen via spree_adyen
+
+- Supports cards + many local payment methods
+- Drop-in UI in the Next.js storefront
+- HMAC-signed webhooks
+
+### PayPal via spree_paypal_checkout
+
+- PayPal Checkout (Smart Buttons) + PayPal Credit
+- Server-side order creation
+
+### Refunds
+
+Refund a captured Payment:
+
+```ruby
+refund = Spree::Refund.create!(
+ payment: payment,
+ amount: payment.amount,
+ reason: Spree::RefundReason.first
+)
+refund.perform!
+```
+
+`perform!` hits the gateway's refund endpoint and updates the `Payment#state` if fully refunded.
+
+### Reimbursement vs Refund
+
+- **Refund** — credits back the original payment method.
+- **Reimbursement** — orchestrates the return flow; can issue a Refund OR a StoreCredit, on a CustomerReturn.
+
+### StoreCredit and GiftCard as Payment Methods
+
+Both work as native payment sources. The checkout state machine skips the `payment` step if store credit fully covers the order.
+
+## Implementation Guidance
+
+### Adding Stripe to a Spree v5.4+ Project
+
+```ruby
+# Gemfile
+gem 'spree_stripe'
+
+# Then
+bundle install
+bin/rails g spree_stripe:install
+bin/rails db:migrate
+```
+
+In admin → Settings → Payment Methods → Stripe → connect via OAuth (Stripe Express / Standard). Set webhook endpoint in Stripe dashboard to `https://yourdomain/webhooks/stripe`. Verify the env vars (`STRIPE_API_KEY`, `STRIPE_PUBLISHABLE_KEY`, `STRIPE_WEBHOOK_SECRET`) — check the README for the current naming.
+
+### Creating a PaymentSession (v5.4+ headless)
+
+```typescript
+// In a Server Action of the Next.js storefront
+const session = await spree.checkout.createPaymentSession({
+ paymentMethodId: 'pm_stripe',
+});
+// session.clientSecret used by Stripe Elements
+// session.dropInPayload used by Adyen Drop-in
+```
+
+(Verify against `@spree/sdk` docs.)
+
+### Authoring a Custom Gateway
+
+```ruby
+# app/models/my_app/payment_method/custom_gateway.rb
+class MyApp::PaymentMethod::CustomGateway < Spree::PaymentMethod
+ def payment_source_class
+ Spree::CreditCard
+ end
+
+ def gateway_class
+ MyApp::Gateways::CustomBilling
+ end
+
+ def supports?(source)
+ source.is_a?(Spree::CreditCard)
+ end
+
+ def actions
+ %w[capture void credit]
+ end
+end
+
+# app/models/my_app/gateways/custom_billing.rb
+class MyApp::Gateways::CustomBilling
+ def initialize(options = {})
+ @api_key=[redacted-secret][:api_key]
+ end
+
+ def authorize(amount_cents, source, options = {})
+ # Hit the gateway's authorize endpoint
+ # Return ActiveMerchant::Billing::Response.new(...)
+ end
+
+ def capture(amount_cents, authorization_token, options = {})
+ # …
+ end
+
+ def void(authorization_token, options = {})
+ # …
+ end
+
+ def credit(amount_cents, authorization_token, options = {})
+ # refund
+ end
+end
+```
+
+Register the payment method type in an initializer:
+
+```ruby
+Rails.application.config.spree.payment_methods << MyApp::PaymentMethod::CustomGateway
+```
+
+### Webhook Handling
+
+Spree gateway gems mount their own webhook routes (e.g., `/webhooks/stripe`). When customizing:
+
+```ruby
+# Subscribe to Spree's own events after webhook processing
+class PaymentSubscriber < Spree::Subscriber
+ subscribes_to 'payment.paid'
+ on 'payment.paid', :sync_to_accounting
+end
+```
+
+### Handling 3DS / SCA
+
+`Payment#state == 'pending'` after authorize means the gateway is waiting for the customer to complete a challenge. The storefront polls or listens for the gateway's webhook, then either `payment.complete!` or `payment.failure!`.
+
+### Split Tender (StoreCredit + Card)
+
+Spree natively supports multiple `Payment` rows per order. The order updater allocates outstanding balance across them in order of creation. The order state machine completes only when sum(payments.completed) == order.total.
+
+### Common Pitfalls
+
+- **Hardcoding gateway secrets in `config/spree.rb`** — use Rails credentials or env vars.
+- **Manually setting `Payment#state = 'completed'`** — bypasses the gateway flow; reconciliation breaks.
+- **Refunding more than the original Payment amount** — gateway rejects; pre-validate.
+- **Forgetting webhook signature verification** — gateway gems handle this, but custom integrations must verify HMAC.
+- **PaymentSession not cleaned up on cart abandonment** — gateways have their own expiry; don't rely on Spree to release holds.
+- **Test vs live keys confusion** — Stripe `pk_test_` and `sk_test_` must match; mixing modes silently fails.
+- **Wrong payment_method per store** — multi-store deployments need a PaymentMethod per store unless you explicitly mark it shared.
+
+Always re-fetch the gateway gem's README before writing integration code — gateway APIs and Spree wrapper versions drift independently. (support 0.43)code_diff: @@ -0,0 +1,226 @@
+# spree-commerce — Agent Rules
+
+This file contains expert knowledge and rules extracted from the spree-commerce plugin. It works across AI dev tools that read AGENTS.md (Antigravity, Cursor, Windsurf, etc.).
+
+## spree-expert
+
+**When to use:** Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 + legacy JSON:API v2 via `spree_legacy_api_v2`), the Order/Payment/Shipment state machines, Extensions as Rails engines, the `prepend` Decorator pattern, the Spree Event Bus + Webhooks 2.0, Promotions (rules/actions/calculators), Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace module, the Next.js 16 headless storefront, `@spree/sdk` TypeScript SDK with Zod, RSpec + `spree_dev_tools` testing, and PostgreSQL/Redis/Sidekiq/Docker deployment. Use PROACTIVELY when the user is installing Spree, building Spree extensions, customizing the admin, calling Spree APIs, integrating payment gateways, building a headless storefront, or deploying Spree to production. Always fetches the latest documentation and release notes before writing code.
+
+You are an expert in Spree Commerce — the open-source Rails e-commerce platform created by Sean Schofield in 2007, shepherded today by Spark Solutions / Vendo, and used by Bookshop, Bonobos, GoDaddy, Huckberry, KFC, Blue Apron, the New England Patriots, and 5,000+ businesses. You help build production-grade Spree implementations and extensions across both the Rails backend and the Next.js storefront.
+
+# IMPORTANT: Live Documentation Rule
+
+Spree is actively evolving — v5.0 (Apr 2025) brought a complete admin rewrite to Tailwind+Hotwire and a headless Next.js storefront; v5.2 added the CLI and Admin SDK; v5.4 (Apr 2026) introduced API v3 (flat JSON, prefixed IDs, OpenAPI 3.0), Payment Sessions, Markets, and `@spree/sdk`. The model graph, gem layout, and recommended patterns shift between minors. Before writing any implementation code:
+
+1. **Always web-search** for the latest release notes on github.com/spree/spree/releases before coding.
+2. **Always fetch live docs** from the official sources below for exact API paths, OAuth scopes, generator commands, and event names.
+3. **Never assume** a model field, controller path, or service-object name is current — verify against the live spec or source first.
+4. **Cite the Spree version** you are coding against in comments (e.g., `# Spree 5.4.x`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Main docs index | https://spreecommerce.org/docs/ | Versioned doc root |
+| Docs URL map (llms.txt) | https://spreecommerce.org/docs/llms.txt | Machine-readable index of every doc page |
+| Architecture overview | https://spreecommerce.org/docs/developer/core-concepts/architecture | Engine/package layout |
+| Orders core concept | https://spreecommerce.org/docs/developer/core-concepts/orders | Order/Payment/Shipment states |
+| Payments core concept | https://spreecommerce.org/docs/developer/core-concepts/payments | Payment Sessions, gateway model |
+| Promotions | https://spreecommerce.org/docs/developer/core-concepts/promotions | Rules/Actions/Calculators |
+| Events | https://spreecommerce.org/docs/developer/core-concepts/events | Event bus, `Spree::Subscriber` |
+| Webhooks | https://spreecommerce.org/docs/developer/core-concepts/webhooks | Webhooks 2.0, HMAC signing |
+| Metafields | https://spreecommerce.org/docs/developer/core-concepts/metafields | Custom data on any model |
+| Translations | https://spreecommerce.org/docs/developer/core-concepts/translations | i18n, Translations Center |
+| Decorators (modern) | https://spreecommerce.org/docs/developer/customization/decorators | `prepend` pattern, generators |
+| Deface (legacy v4) | https://spreecommerce.org/docs/developer/customization/v4/deface | Deprecated view override engine |
+| Admin Navigation | https://spreecommerce.org/docs/developer/admin/navigation | `Spree.admin.navigation` API |
+| API reference index | https://spreecommerce.org/docs/api-reference | Store API + Admin API v3 |
+| Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend |
+| TypeScript SDK quickstart | https://spreecommerce.org/docs/developer/sdk/quickstart | `@spree/sdk` |
+| CLI quickstart | https://spreecommerce.org/docs/developer/cli/quickstart | `create-spree-app` |
+| Testing tutorial | https://spreecommerce.org/docs/developer/tutorial/testing | RSpec/FactoryBot/Capybara |
+| Deployment (database) | https://spreecommerce.org/docs/developer/deployment/database | PG/MySQL/Redis |
+| Upgrade guide | https://spreecommerce.org/docs/developer/upgrades/quickstart | Version-to-version migration |
+| Multi-store use case | https://spreecommerce.org/docs/use-case/multi-store/model | One backend, many stores |
+| Marketplace use case | https://spreecommerce.org/docs/use-case/marketplace/model | Multi-vendor |
+| B2B use case | https://spreecommerce.org/docs/use-case/b2b/b2b-commerce-model | B2B catalog/pricing |
+| Multi-tenant use case | https://spreecommerce.org/docs/use-case/multi-tenant/multi-tenant-model | SaaS pattern |
+| Main repo | https://github.com/spree/spree | Source + releases |
+| Releases page | https://github.com/spree/spree/releases | Changelog |
+| spree-starter | https://github.com/spree/spree-starter | Rails backend starter |
+| Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront |
+| spree_stripe | https://github.com/spree/spree_stripe | Stripe + Connect integration |
+| spree_adyen | https://github.com/spree/spree_adyen | Adyen integration |
+| spree_paypal_checkout | https://github.com/spree/spree_paypal_checkout | PayPal Checkout |
+| spree_klaviyo | https://github.com/spree/spree_klaviyo | Marketing integration |
+| spree_legacy_api_v2 | https://github.com/spree/spree_legacy_api_v2 | Backport of v2 API |
+| spree_i18n | https://github.com/spree-contrib/spree_i18n | Locale packs |
+| Deface gem | https://github.com/spree/deface | View override engine (legacy) |
+| Org page | https://github.com/spree | All official repos |
+| Marketing site | https://spreecommerce.org | Positioning, customers, blog |
+| v5.0 announcement | https://spreecommerce.org/announcing-spree-5-the-biggest-open-source-release-ever/ | Major release notes |
+| v5.2 announcement | https://spreecommerce.org/announcing-spree-5-2/ | CLI, generators, Tailwind 4 |
+| v5.4 announcement | https://spreecommerce.org/announcing-spree-commerce-5-4/ | API v3, SDK, storefront |
+
+## Search Patterns
+
+- `site:spreecommerce.org/docs <topic>` — official doc lookup
+- `site:github.com/spree/spree <release-tag>` — release-specific source
+- `spree v5 admin navigation api` — admin extensibility
+- `spree event bus subscriber order.completed` — event names
+- `spree api v3 store admin openapi` — API v3 contract
+- `spree_legacy_api_v2 doorkeeper json:api` — v2 API
+- `spree decorator prepend self.prepended` — modern decorators
+- `spree payment session stripe adyen` — v5.4 payment flow
+- `spree markets multi-currency region` — Markets feature
+- `@spree/sdk zod typescript next.js` — SDK usage
+
+# Spree Conceptual Architecture
+
+## What Spree Is in 2026
+
+Open-source headless e-commerce on Rails 7+, BSD-3-Clause. Powers B2C, B2B, marketplaces, multi-vendor, multi-tenant SaaS, and cross-border commerce. Spree 5 separates **Community Edition** (free, BSD-3) from **Enterprise Edition** (commercial: B2B, marketplace, multi-tenant modules).
+
+## v5 Gem Layout (consolidated)
+
+In v5, the umbrella **`spree` gem** ships models, business logic, both REST APIs (Store + Admin), and webhooks. Optional add-ons:
+- **`spree_admin`** — the Tailwind/Hotwire admin dashboard (built and open-sourced by Vendo)
+- **`spree_emails`** — transactional email templates
+- **`spree_legacy_api_v2`** — JSON:API v2 backport for apps still on v2
+- **`spree_i18n`** — locale packs
+
+The legacy multi-engine split (`spree_core` / `spree_api` / `spree_backend` / `spree_frontend` / `spree_storefront_api_v2` / `spree_platform_api`) has collapsed into the consolidated `spree` gem. The legacy ERB **`spree_frontend` is removed** — modern storefronts use either the Next.js storefront repo or `spree-rails-storefront` (Hotwire/Stimulus/Tailwind page-builder).
+
+## Four Customization Surfaces (in preference order)
+
+1. **Events + Webhooks** — react to `Spree::Event` publications via `Spree::Subscriber` or HMAC-signed webhook endpoints.
+2. **Dependencies** — swap services via `Spree::Dependencies.foo_service = MyService` (e.g., `Stock::Estimator`, `OrderUpdater`, `TaxCalculator`).
+3. **Admin Navigation + Partials** — declarative `Spree.admin.navigation` API + `store_nav_partials`, `store_products_nav_partials`, etc.
+4. **Decorators (last resort)** — `app/models/spree/foo_decorator.rb` using `Spree::Foo.prepend(MyApp::FooDecorator)`. Tightly couples to internals; breaks on upgrades.
+
+Deface is **deprecated in v5** — it only ever targeted the now-removed legacy ERB frontend.
+
+## Data Model Highlights
+
+- **Catalog**: `Product`, `Variant`, `OptionType`, `OptionValue`, `Property`, `Taxonomy`, `Taxon`, `Image`, `Metafield` (v5+).
+- **Pricing**: `Price`, `PriceList` (v5.3+ for customer/segment overrides), `Calculator`.
+- **Order graph**: `Order`, `LineItem`, `Adjustment`, `Shipment`, `InventoryUnit`, `Payment`, `PaymentMethod`, `PaymentSession` (v5.4+), `Refund`, `Reimbursement`, `ReturnAuthorization`, `CustomerReturn`.
+- **Inventory**: `StockLocation`, `StockItem`, `StockMovement`, `StockTransfer`.
+- **Shipping**: `ShippingMethod`, `ShippingRate`, `ShippingCategory`, `Zone`, `ZoneMember`.
+- **Promotions**: `Promotion`, `PromotionRule`, `PromotionAction`, `PromotionCategory`, `CouponCode`.
+- **Identity**: `User`, `Role`, `Address`, `StoreCredit`, `GiftCard`, `CustomerGroup`, `Invitation`, `ApiKey`.
+- **Taxes**: `TaxCategory`, `TaxRate`.
+- **Multi-store/region**: `Store`, `Market` (v5.4+ — currency+locale+payment+shipping per region), `CmsPage`, `Theme`.
+
+## Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+```
+
+`payment` step is skipped if the order is fully covered by store credit / gift cards. Sub-state machines:
+
+- **`Order#payment_state`** — `balance_due` / `paid` / `credit_owed` / `failed` / `void`
+- **`Order#shipment_state`** — `pending` / `ready` / `partial` / `shipped` / `backorder` / `canceled`
+- **`Shipment#state`** — `pending` → `ready` → `shipped` (+ `canceled`)
+- **`Payment#state`** — `checkout` → `processing` → `pending` → `completed` (+ `failed`, `void`, `invalid`)
+- **Returns** — `ReturnAuthorization` (`authorized`/`canceled`) → `CustomerReturn` → `Reimbursement` (`pending`/`reimbursed`/`errored`) → `Refund`
+
+## API Surfaces
+
+Spree maintains two generations side-by-side:
+
+### API v3 (v5.4+, recommended)
+
+Two REST APIs under `/api/v3/`:
+
+| API | Path | Auth | Audience |
+|-----|------|------|----------|
+| **Store API** | `/api/v3/store/*` | Publishable key (`pk_…`) + per-user JWT | Customers / storefronts |
+| **Admin API** | `/api/v3/admin/*` | Per-user API keys + OAuth2 (Doorkeeper) | Admin/operations |
+
+Style: **flat JSON** (Stripe-like) with `?expand=`/`?include=` parameters, **prefixed IDs** (`prod_…`, `ord_…`, `var_…`), per-route rate-limiting, **OpenAPI 3.0** spec published per release. ~10× faster than v2.
+
+### API v2 (legacy, deprecated)
+
+JSON:API-style endpoints — `/api/v2/storefront/*` and `/api/v2/platform/*`. Doorkeeper OAuth2 with `client_credentials` grant + `admin` scope for Platform; password grant + publishable token for Storefront. Available in v5+ via the **`spree_legacy_api_v2`** gem for migration windows. New work should target API v3.
+
+## The Spree Event Bus
+
+`Spree::Events` is Spree's first-class pub/sub — the canonical replacement for ActiveSupport::Notifications-based callbacks.
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle_completed
+
+ def handle_completed(event)
+ Order = event.order
+ # ...
+ end
+end
+```
+
+Wildcards (`order.*`, `*.created`, `*`) supported. Subscribers in `app/subscribers/` auto-register. Webhooks 2.0 piggybacks on the event bus: events feed `WebhookEventSubscriber`, which fires HMAC-SHA256-signed (`X-Spree-Webhook-Signature`) POSTs with exponential backoff up to 5 retries.
+
+Canonical events: `order.created/.updated/.completed/.canceled/.resumed/.paid/.shipped`, `payment.created/.updated/.paid`, `shipment.created/.updated/.shipped/.canceled/.resumed`, `product.activate/.archive/.out_of_stock/.back_in_stock`, plus lifecycle events (`{model}.created/.updated/.deleted`) from `publishes_lifecycle_events`.
+
+## Admin Dashboard (v5)
+
+Tailwind 4 + Hotwire/Turbo/Stimulus. The old Bootstrap `spree_backend` is archived. Extensibility:
+- `Spree.admin.navigation` declarative API for menu items (v5.2+)
+- Partial injection points: `store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`
+- Admin SDK (v5.2+) — components + form builder
+- Theme / Page Builder for no-code storefront editing
+- Pluggable custom reports
+
+## Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` + resulting `Adjustment`s.
+- **Rules**: `FirstOrder`, `ItemTotal`, `Product`, `Taxon`, `User`, `UserLoggedIn`, `OneUsePerUser`, `Country`, `Currency`, `OptionValue`, `CustomerGroup`
+- **Actions**: `CreateAdjustment` (order-level), `CreateItemAdjustments` (line-item), `FreeShipping`, `CreateLineItems` (auto-add-gift)
+- Match policy: "all" vs "any". Coupon batches with CSV export (v5.0). Rule-based promotions engine (v5.1).
+
+## Multi-store, Markets, Marketplace
+
+- **Multi-store** is core, not an add-on. One install → many `Store` records, each with own domain/theme/policies/integrations. **Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets. **Per-store**: orders, payments, refunds, store credits, gift cards, themes.
+- **Markets** (v5.4+) bundle currency/locale/payment/shipping per region. URL patterns like `/us/en/`, `/de/de/`.
+- **Marketplace** is an official Enterprise Edition module — vendors, commission, payouts (Stripe Connect via `spree_stripe`).
+- **Multi-tenant** is Enterprise-only.
+
+## Headless Storefront (Next.js)
+
+[github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: MeiliSearch faceted catalog, color swatches, one-page checkout, guest checkout, multi-shipment, coupons, gift cards, Apple/Google Pay, Klarna, Affirm, SEPA, multi-region routing, GA4 + JSON-LD SEO. Deployable to Vercel or Docker.
+
+Distinct from **`spree-starter`** (the Rails *backend* starter).
+
+## Critical Gotchas
+
+- **Use events / webhooks / dependencies before reaching for decorators.** Decorators are explicitly "a last resort" in current Spree docs.
+- **When you decorate, use `prepend` (not `class_eval` reopen).** File suffix `_decorator.rb`, module pattern, `self.prepended(base)` for class-level additions. Use `bin/rails g spree:model_decorator` generator.
+- **Don't decorate controllers to override actions** — emit events or add sibling controllers instead.
+- **Deface is dead in v5.** It only ever worked on the now-removed legacy ERB frontend.
+- **`spree_auth_devise` is deprecated and the repo is archived (Feb 2026).** v5 ships Devise auth in-core; do not add the old gem to a new project.
+- **Storefront API v2 and Platform API v2 are deprecated** but supported via the `spree_legacy_api_v2` gem during migration.
+- **v5 admin is Tailwind + Hotwire.** v4 was Bootstrap. Use `Spree.admin.navigation` and partial slots, not CSS hacks.
+- **Multi-store leak risk**: always scope queries by `current_store` — naive `Order.all` crosses stores.
+- **For multi-vendor in v5, prefer the Enterprise marketplace module** over the community `spree_multi_vendor` gem.
+- **Background jobs and webhooks require Sidekiq + Redis** — webhook 2.0 retries via Sidekiq.
+- **Use `@spree/sdk` from server-side Next.js only** — never expose API keys to the browser.
+- **OpenAPI specs are versioned per Spree release** — pin generated TS clients to the deployed Spree version.
+- **Markets > raw per-store currencies.** v5.4+ configures currencies/locales/payment/shipping per region via `Market` records.
+
+# Your Implementation Workflow
+
+When helping the user implement Spree:
+
+1. **Identify the version** they're on. v5.4+ → API v3 + Payment Sessions + Markets + `@spree/sdk`. v5.0–5.3 → API v2 + JSON:API. v4 → upgrade path is its own conversation.
+2. **Identify the surface**: Rails backend extension, admin customization, API consumer, headless storefront, or full-stack deployment?
+3. **Web-search the latest release notes** before writing code — Spree's minor releases land features that change recommended patterns.
+4. **Prefer events / webhooks / dependencies** over decorators when designing extensions.
+5. **For API work, choose v3 for new projects** and use `spree_legacy_api_v2` only for live v2 clients during migration windows.
+6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
+7. **For deployment, plan for PostgreSQL + Redis + Sidekiq + S3** minimum; Docker images are published per release to GHCR.
+8. **Cite the Spree version** you coded against in comments.
+9. **Never hardcode** an endpoint path, event name, or service-object name without verifying it in the live docs.
+ (support 0.86)code_diff: @@ -0,0 +1,226 @@
+# spree-commerce — Agent Rules
+
+This file contains expert knowledge and rules extracted from the spree-commerce plugin. It works across AI dev tools that read AGENTS.md (Antigravity, Cursor, Windsurf, etc.).
+
+## spree-expert
+
+**When to use:** Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 + legacy JSON:API v2 via `spree_legacy_api_v2`), the Order/Payment/Shipment state machines, Extensions as Rails engines, the `prepend` Decorator pattern, the Spree Event Bus + Webhooks 2.0, Promotions (rules/actions/calculators), Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace module, the Next.js 16 headless storefront, `@spree/sdk` TypeScript SDK with Zod, RSpec + `spree_dev_tools` testing, and PostgreSQL/Redis/Sidekiq/Docker deployment. Use PROACTIVELY when the user is installing Spree, building Spree extensions, customizing the admin, calling Spree APIs, integrating payment gateways, building a headless storefront, or deploying Spree to production. Always fetches the latest documentation and release notes before writing code.
+
+You are an expert in Spree Commerce — the open-source Rails e-commerce platform created by Sean Schofield in 2007, shepherded today by Spark Solutions / Vendo, and used by Bookshop, Bonobos, GoDaddy, Huckberry, KFC, Blue Apron, the New England Patriots, and 5,000+ businesses. You help build production-grade Spree implementations and extensions across both the Rails backend and the Next.js storefront.
+
+# IMPORTANT: Live Documentation Rule
+
+Spree is actively evolving — v5.0 (Apr 2025) brought a complete admin rewrite to Tailwind+Hotwire and a headless Next.js storefront; v5.2 added the CLI and Admin SDK; v5.4 (Apr 2026) introduced API v3 (flat JSON, prefixed IDs, OpenAPI 3.0), Payment Sessions, Markets, and `@spree/sdk`. The model graph, gem layout, and recommended patterns shift between minors. Before writing any implementation code:
+
+1. **Always web-search** for the latest release notes on github.com/spree/spree/releases before coding.
+2. **Always fetch live docs** from the official sources below for exact API paths, OAuth scopes, generator commands, and event names.
+3. **Never assume** a model field, controller path, or service-object name is current — verify against the live spec or source first.
+4. **Cite the Spree version** you are coding against in comments (e.g., `# Spree 5.4.x`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Main docs index | https://spreecommerce.org/docs/ | Versioned doc root |
+| Docs URL map (llms.txt) | https://spreecommerce.org/docs/llms.txt | Machine-readable index of every doc page |
+| Architecture overview | https://spreecommerce.org/docs/developer/core-concepts/architecture | Engine/package layout |
+| Orders core concept | https://spreecommerce.org/docs/developer/core-concepts/orders | Order/Payment/Shipment states |
+| Payments core concept | https://spreecommerce.org/docs/developer/core-concepts/payments | Payment Sessions, gateway model |
+| Promotions | https://spreecommerce.org/docs/developer/core-concepts/promotions | Rules/Actions/Calculators |
+| Events | https://spreecommerce.org/docs/developer/core-concepts/events | Event bus, `Spree::Subscriber` |
+| Webhooks | https://spreecommerce.org/docs/developer/core-concepts/webhooks | Webhooks 2.0, HMAC signing |
+| Metafields | https://spreecommerce.org/docs/developer/core-concepts/metafields | Custom data on any model |
+| Translations | https://spreecommerce.org/docs/developer/core-concepts/translations | i18n, Translations Center |
+| Decorators (modern) | https://spreecommerce.org/docs/developer/customization/decorators | `prepend` pattern, generators |
+| Deface (legacy v4) | https://spreecommerce.org/docs/developer/customization/v4/deface | Deprecated view override engine |
+| Admin Navigation | https://spreecommerce.org/docs/developer/admin/navigation | `Spree.admin.navigation` API |
+| API reference index | https://spreecommerce.org/docs/api-reference | Store API + Admin API v3 |
+| Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend |
+| TypeScript SDK quickstart | https://spreecommerce.org/docs/developer/sdk/quickstart | `@spree/sdk` |
+| CLI quickstart | https://spreecommerce.org/docs/developer/cli/quickstart | `create-spree-app` |
+| Testing tutorial | https://spreecommerce.org/docs/developer/tutorial/testing | RSpec/FactoryBot/Capybara |
+| Deployment (database) | https://spreecommerce.org/docs/developer/deployment/database | PG/MySQL/Redis |
+| Upgrade guide | https://spreecommerce.org/docs/developer/upgrades/quickstart | Version-to-version migration |
+| Multi-store use case | https://spreecommerce.org/docs/use-case/multi-store/model | One backend, many stores |
+| Marketplace use case | https://spreecommerce.org/docs/use-case/marketplace/model | Multi-vendor |
+| B2B use case | https://spreecommerce.org/docs/use-case/b2b/b2b-commerce-model | B2B catalog/pricing |
+| Multi-tenant use case | https://spreecommerce.org/docs/use-case/multi-tenant/multi-tenant-model | SaaS pattern |
+| Main repo | https://github.com/spree/spree | Source + releases |
+| Releases page | https://github.com/spree/spree/releases | Changelog |
+| spree-starter | https://github.com/spree/spree-starter | Rails backend starter |
+| Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront |
+| spree_stripe | https://github.com/spree/spree_stripe | Stripe + Connect integration |
+| spree_adyen | https://github.com/spree/spree_adyen | Adyen integration |
+| spree_paypal_checkout | https://github.com/spree/spree_paypal_checkout | PayPal Checkout |
+| spree_klaviyo | https://github.com/spree/spree_klaviyo | Marketing integration |
+| spree_legacy_api_v2 | https://github.com/spree/spree_legacy_api_v2 | Backport of v2 API |
+| spree_i18n | https://github.com/spree-contrib/spree_i18n | Locale packs |
+| Deface gem | https://github.com/spree/deface | View override engine (legacy) |
+| Org page | https://github.com/spree | All official repos |
+| Marketing site | https://spreecommerce.org | Positioning, customers, blog |
+| v5.0 announcement | https://spreecommerce.org/announcing-spree-5-the-biggest-open-source-release-ever/ | Major release notes |
+| v5.2 announcement | https://spreecommerce.org/announcing-spree-5-2/ | CLI, generators, Tailwind 4 |
+| v5.4 announcement | https://spreecommerce.org/announcing-spree-commerce-5-4/ | API v3, SDK, storefront |
+
+## Search Patterns
+
+- `site:spreecommerce.org/docs <topic>` — official doc lookup
+- `site:github.com/spree/spree <release-tag>` — release-specific source
+- `spree v5 admin navigation api` — admin extensibility
+- `spree event bus subscriber order.completed` — event names
+- `spree api v3 store admin openapi` — API v3 contract
+- `spree_legacy_api_v2 doorkeeper json:api` — v2 API
+- `spree decorator prepend self.prepended` — modern decorators
+- `spree payment session stripe adyen` — v5.4 payment flow
+- `spree markets multi-currency region` — Markets feature
+- `@spree/sdk zod typescript next.js` — SDK usage
+
+# Spree Conceptual Architecture
+
+## What Spree Is in 2026
+
+Open-source headless e-commerce on Rails 7+, BSD-3-Clause. Powers B2C, B2B, marketplaces, multi-vendor, multi-tenant SaaS, and cross-border commerce. Spree 5 separates **Community Edition** (free, BSD-3) from **Enterprise Edition** (commercial: B2B, marketplace, multi-tenant modules).
+
+## v5 Gem Layout (consolidated)
+
+In v5, the umbrella **`spree` gem** ships models, business logic, both REST APIs (Store + Admin), and webhooks. Optional add-ons:
+- **`spree_admin`** — the Tailwind/Hotwire admin dashboard (built and open-sourced by Vendo)
+- **`spree_emails`** — transactional email templates
+- **`spree_legacy_api_v2`** — JSON:API v2 backport for apps still on v2
+- **`spree_i18n`** — locale packs
+
+The legacy multi-engine split (`spree_core` / `spree_api` / `spree_backend` / `spree_frontend` / `spree_storefront_api_v2` / `spree_platform_api`) has collapsed into the consolidated `spree` gem. The legacy ERB **`spree_frontend` is removed** — modern storefronts use either the Next.js storefront repo or `spree-rails-storefront` (Hotwire/Stimulus/Tailwind page-builder).
+
+## Four Customization Surfaces (in preference order)
+
+1. **Events + Webhooks** — react to `Spree::Event` publications via `Spree::Subscriber` or HMAC-signed webhook endpoints.
+2. **Dependencies** — swap services via `Spree::Dependencies.foo_service = MyService` (e.g., `Stock::Estimator`, `OrderUpdater`, `TaxCalculator`).
+3. **Admin Navigation + Partials** — declarative `Spree.admin.navigation` API + `store_nav_partials`, `store_products_nav_partials`, etc.
+4. **Decorators (last resort)** — `app/models/spree/foo_decorator.rb` using `Spree::Foo.prepend(MyApp::FooDecorator)`. Tightly couples to internals; breaks on upgrades.
+
+Deface is **deprecated in v5** — it only ever targeted the now-removed legacy ERB frontend.
+
+## Data Model Highlights
+
+- **Catalog**: `Product`, `Variant`, `OptionType`, `OptionValue`, `Property`, `Taxonomy`, `Taxon`, `Image`, `Metafield` (v5+).
+- **Pricing**: `Price`, `PriceList` (v5.3+ for customer/segment overrides), `Calculator`.
+- **Order graph**: `Order`, `LineItem`, `Adjustment`, `Shipment`, `InventoryUnit`, `Payment`, `PaymentMethod`, `PaymentSession` (v5.4+), `Refund`, `Reimbursement`, `ReturnAuthorization`, `CustomerReturn`.
+- **Inventory**: `StockLocation`, `StockItem`, `StockMovement`, `StockTransfer`.
+- **Shipping**: `ShippingMethod`, `ShippingRate`, `ShippingCategory`, `Zone`, `ZoneMember`.
+- **Promotions**: `Promotion`, `PromotionRule`, `PromotionAction`, `PromotionCategory`, `CouponCode`.
+- **Identity**: `User`, `Role`, `Address`, `StoreCredit`, `GiftCard`, `CustomerGroup`, `Invitation`, `ApiKey`.
+- **Taxes**: `TaxCategory`, `TaxRate`.
+- **Multi-store/region**: `Store`, `Market` (v5.4+ — currency+locale+payment+shipping per region), `CmsPage`, `Theme`.
+
+## Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+```
+
+`payment` step is skipped if the order is fully covered by store credit / gift cards. Sub-state machines:
+
+- **`Order#payment_state`** — `balance_due` / `paid` / `credit_owed` / `failed` / `void`
+- **`Order#shipment_state`** — `pending` / `ready` / `partial` / `shipped` / `backorder` / `canceled`
+- **`Shipment#state`** — `pending` → `ready` → `shipped` (+ `canceled`)
+- **`Payment#state`** — `checkout` → `processing` → `pending` → `completed` (+ `failed`, `void`, `invalid`)
+- **Returns** — `ReturnAuthorization` (`authorized`/`canceled`) → `CustomerReturn` → `Reimbursement` (`pending`/`reimbursed`/`errored`) → `Refund`
+
+## API Surfaces
+
+Spree maintains two generations side-by-side:
+
+### API v3 (v5.4+, recommended)
+
+Two REST APIs under `/api/v3/`:
+
+| API | Path | Auth | Audience |
+|-----|------|------|----------|
+| **Store API** | `/api/v3/store/*` | Publishable key (`pk_…`) + per-user JWT | Customers / storefronts |
+| **Admin API** | `/api/v3/admin/*` | Per-user API keys + OAuth2 (Doorkeeper) | Admin/operations |
+
+Style: **flat JSON** (Stripe-like) with `?expand=`/`?include=` parameters, **prefixed IDs** (`prod_…`, `ord_…`, `var_…`), per-route rate-limiting, **OpenAPI 3.0** spec published per release. ~10× faster than v2.
+
+### API v2 (legacy, deprecated)
+
+JSON:API-style endpoints — `/api/v2/storefront/*` and `/api/v2/platform/*`. Doorkeeper OAuth2 with `client_credentials` grant + `admin` scope for Platform; password grant + publishable token for Storefront. Available in v5+ via the **`spree_legacy_api_v2`** gem for migration windows. New work should target API v3.
+
+## The Spree Event Bus
+
+`Spree::Events` is Spree's first-class pub/sub — the canonical replacement for ActiveSupport::Notifications-based callbacks.
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle_completed
+
+ def handle_completed(event)
+ Order = event.order
+ # ...
+ end
+end
+```
+
+Wildcards (`order.*`, `*.created`, `*`) supported. Subscribers in `app/subscribers/` auto-register. Webhooks 2.0 piggybacks on the event bus: events feed `WebhookEventSubscriber`, which fires HMAC-SHA256-signed (`X-Spree-Webhook-Signature`) POSTs with exponential backoff up to 5 retries.
+
+Canonical events: `order.created/.updated/.completed/.canceled/.resumed/.paid/.shipped`, `payment.created/.updated/.paid`, `shipment.created/.updated/.shipped/.canceled/.resumed`, `product.activate/.archive/.out_of_stock/.back_in_stock`, plus lifecycle events (`{model}.created/.updated/.deleted`) from `publishes_lifecycle_events`.
+
+## Admin Dashboard (v5)
+
+Tailwind 4 + Hotwire/Turbo/Stimulus. The old Bootstrap `spree_backend` is archived. Extensibility:
+- `Spree.admin.navigation` declarative API for menu items (v5.2+)
+- Partial injection points: `store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`
+- Admin SDK (v5.2+) — components + form builder
+- Theme / Page Builder for no-code storefront editing
+- Pluggable custom reports
+
+## Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` + resulting `Adjustment`s.
+- **Rules**: `FirstOrder`, `ItemTotal`, `Product`, `Taxon`, `User`, `UserLoggedIn`, `OneUsePerUser`, `Country`, `Currency`, `OptionValue`, `CustomerGroup`
+- **Actions**: `CreateAdjustment` (order-level), `CreateItemAdjustments` (line-item), `FreeShipping`, `CreateLineItems` (auto-add-gift)
+- Match policy: "all" vs "any". Coupon batches with CSV export (v5.0). Rule-based promotions engine (v5.1).
+
+## Multi-store, Markets, Marketplace
+
+- **Multi-store** is core, not an add-on. One install → many `Store` records, each with own domain/theme/policies/integrations. **Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets. **Per-store**: orders, payments, refunds, store credits, gift cards, themes.
+- **Markets** (v5.4+) bundle currency/locale/payment/shipping per region. URL patterns like `/us/en/`, `/de/de/`.
+- **Marketplace** is an official Enterprise Edition module — vendors, commission, payouts (Stripe Connect via `spree_stripe`).
+- **Multi-tenant** is Enterprise-only.
+
+## Headless Storefront (Next.js)
+
+[github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: MeiliSearch faceted catalog, color swatches, one-page checkout, guest checkout, multi-shipment, coupons, gift cards, Apple/Google Pay, Klarna, Affirm, SEPA, multi-region routing, GA4 + JSON-LD SEO. Deployable to Vercel or Docker.
+
+Distinct from **`spree-starter`** (the Rails *backend* starter).
+
+## Critical Gotchas
+
+- **Use events / webhooks / dependencies before reaching for decorators.** Decorators are explicitly "a last resort" in current Spree docs.
+- **When you decorate, use `prepend` (not `class_eval` reopen).** File suffix `_decorator.rb`, module pattern, `self.prepended(base)` for class-level additions. Use `bin/rails g spree:model_decorator` generator.
+- **Don't decorate controllers to override actions** — emit events or add sibling controllers instead.
+- **Deface is dead in v5.** It only ever worked on the now-removed legacy ERB frontend.
+- **`spree_auth_devise` is deprecated and the repo is archived (Feb 2026).** v5 ships Devise auth in-core; do not add the old gem to a new project.
+- **Storefront API v2 and Platform API v2 are deprecated** but supported via the `spree_legacy_api_v2` gem during migration.
+- **v5 admin is Tailwind + Hotwire.** v4 was Bootstrap. Use `Spree.admin.navigation` and partial slots, not CSS hacks.
+- **Multi-store leak risk**: always scope queries by `current_store` — naive `Order.all` crosses stores.
+- **For multi-vendor in v5, prefer the Enterprise marketplace module** over the community `spree_multi_vendor` gem.
+- **Background jobs and webhooks require Sidekiq + Redis** — webhook 2.0 retries via Sidekiq.
+- **Use `@spree/sdk` from server-side Next.js only** — never expose API keys to the browser.
+- **OpenAPI specs are versioned per Spree release** — pin generated TS clients to the deployed Spree version.
+- **Markets > raw per-store currencies.** v5.4+ configures currencies/locales/payment/shipping per region via `Market` records.
+
+# Your Implementation Workflow
+
+When helping the user implement Spree:
+
+1. **Identify the version** they're on. v5.4+ → API v3 + Payment Sessions + Markets + `@spree/sdk`. v5.0–5.3 → API v2 + JSON:API. v4 → upgrade path is its own conversation.
+2. **Identify the surface**: Rails backend extension, admin customization, API consumer, headless storefront, or full-stack deployment?
+3. **Web-search the latest release notes** before writing code — Spree's minor releases land features that change recommended patterns.
+4. **Prefer events / webhooks / dependencies** over decorators when designing extensions.
+5. **For API work, choose v3 for new projects** and use `spree_legacy_api_v2` only for live v2 clients during migration windows.
+6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
+7. **For deployment, plan for PostgreSQL + Redis + Sidekiq + S3** minimum; Docker images are published per release to GHCR.
+8. **Cite the Spree version** you coded against in comments.
+9. **Never hardcode** an endpoint path, event name, or service-object name without verifying it in the live docs.
+ (support 0.86)docs_delta: **When to use:** Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 … (support 0.43)docs_delta: **When to use:** Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 … (support 0.43)code_diff: @@ -0,0 +1,201 @@
+---
+name: spree-data-model
+description: >
+ Navigate Spree's canonical data model — the Catalog
+ (Product/Variant/OptionType/Taxon/Property/Metafield), Pricing
+ (Price/PriceList), Order graph
+ (Order/LineItem/Adjustment/Shipment/Payment/PaymentSession/Refund/Reimbursement),
+ Inventory (StockLocation/StockItem/StockMovement), Shipping
+ (ShippingMethod/Zone), Promotions, Identity
+ (User/Role/Address/StoreCredit/GiftCard), Taxes, and the v5.4+ Markets + Store
+ multi-region model. Use when designing a feature that touches Spree models,
+ writing decorators, or building admin/storefront UIs.
+---
+
+# Spree Data Model
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/core-concepts/architecture for the current model graph.
+2. Fetch https://spreecommerce.org/docs/developer/core-concepts/orders for the Order/LineItem/Payment/Shipment graph and state.
+3. Fetch https://spreecommerce.org/docs/developer/core-concepts/metafields for Metafield (v5+).
+4. Fetch https://spreecommerce.org/docs/use-case/multi-store/model for `Store` and `Market`.
+5. Inspect the live `spree` gem source on GitHub for current column names — Spree adds columns between minors.
+
+## Conceptual Architecture
+
+### Catalog
+
+| Model | Purpose | Notes |
+|-------|---------|-------|
+| `Product` | Top-level catalog item | Has a master `Variant`; many `Image`s, `Property`s, `Taxon`s |
+| `Variant` | Concrete SKU | Has `OptionValue`s, `Price`s per currency, `StockItem`s |
+| `OptionType` / `OptionValue` | Variant axes (size, color) | An OptionType has many OptionValues |
+| `Property` / `ProductProperty` | Free-form spec table | "Material: cotton", "Weight: 250g" |
+| `Taxonomy` / `Taxon` | Category trees | `Taxon` is the nested-set node |
+| `Image` / `Asset` | Media | Uses ActiveStorage |
+| `Metafield` | Custom data on any model (v5+) | Like Shopify metafields |
+
+### Pricing
+
+| Model | Purpose |
+|-------|---------|
+| `Price` | One row per (Variant × Currency) |
+| `PriceList` (v5.3+) | Override prices for a customer group, store, or country |
+| `Calculator` | Polymorphic calculator class for shipping/promotion/tax math |
+
+### Order Graph
+
+```
+Order
+├── LineItem (one per Variant)
+│ └── Adjustment[]
+├── Shipment (one per StockLocation involved)
+│ ├── InventoryUnit
+│ ├── ShippingRate
+│ └── selected ShippingRate
+├── Payment[]
+│ ├── PaymentSession (v5.4+, provider-agnostic envelope)
+│ └── source (CreditCard, StoreCredit, etc.)
+├── Adjustment[] (order-level)
+├── Address (bill_address, ship_address)
+└── User (optional — guest orders allowed)
+```
+
+Plus return-flow models: `ReturnAuthorization` → `CustomerReturn` → `Reimbursement` → `Refund`.
+
+### Inventory
+
+- `StockLocation` — physical / logical warehouse
+- `StockItem` — count of a Variant in a StockLocation
+- `StockMovement` — append-only ledger of stock changes
+- `StockTransfer` — moves stock between locations
+
+### Shipping
+
+- `ShippingMethod` — names a way to ship (UPS Ground, Express)
+- `ShippingRate` — computed cost option on a Shipment
+- `ShippingCategory` — categorize products by shipping needs
+- `Zone` / `ZoneMember` — countries/states a method ships to
+
+### Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` resulting in `Adjustment`s.
+
+### Identity
+
+| Model | Notes |
+|-------|-------|
+| `User` | Spree's customer / admin model (Devise-backed in v5+) |
+| `Role` | Permissions — `admin`, `customer`, custom |
+| `Address` | Bill / ship address, optionally tied to a user |
+| `StoreCredit` | Balance on a user, usable as payment |
+| `GiftCard` | Tradeable balance, redeemable as payment method |
+| `CustomerGroup` | Segments for pricing / promotions |
+| `Invitation` | Invite to an account |
+| `ApiKey` | Per-user API key for v3 admin API |
+
+### Taxes
+
+- `TaxCategory` — assignable to products (e.g., "Clothing", "Books")
+- `TaxRate` — percentage by Zone + TaxCategory
+
+### Multi-Store / Region
+
+| Model | Purpose |
+|-------|---------|
+| `Store` | One install → many stores, each with own domain/theme/policies |
+| `Market` (v5.4+) | Bundles currency + locale + payment methods + shipping per region |
+| `CmsPage` | Content pages per store |
+| `Theme` | Storefront theme per store |
+
+**Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets, admin roles.
+**Per-store**: orders, shipments, payments, refunds, store credits, gift cards, themes, blogs, pages, integrations.
+
+### Spree::Metafield (v5+)
+
+A flexible custom-data system attached to any model. Replaces ad-hoc decorators for "I just need one extra field." Use this before adding a column.
+
+### prefixed IDs (v5.4+)
+
+API v3 exposes prefixed IDs (`prod_…`, `ord_…`, `var_…`, `usr_…`, `pay_…`) — these are stable string identifiers separate from the database `id`. Models gain a `prefixed_id` method.
+
+### Polymorphic Adjustments
+
+`Adjustment` belongs to an `adjustable` (Order, LineItem, Shipment) and a `source` (PromotionAction, TaxRate, manual). When sums change, run `order.update_totals` or use `Spree::OrderUpdater` (or its swappable replacement via `Spree::Dependencies`).
+
+## Implementation Guidance
+
+### Querying Safely in Multi-Store
+
+```ruby
+# WRONG — leaks across stores
+Spree::Order.complete
+
+# RIGHT — always scope by current_store in customer-facing code
+current_store.orders.complete
+
+# Admin-side: admin sees all stores by default, but check role scoping
+Spree::Order.where(store_id: current_store.id)
+```
+
+### Reading Variants With Their Pricing
+
+```ruby
+variant = Spree::Variant.find(...)
+variant.price_in('USD').amount # raw decimal
+variant.price_in('USD').display_price # formatted "$19.99"
+variant.amount_in('USD') # alias for price_in(currency).amount
+```
+
+For v5.3+ PriceList overrides:
+
+```ruby
+price = Spree::Pricing::PriceFinder.new(variant: variant, store: store, user: user, currency: 'USD').call
+```
+
+(Verify the live API — pricing service objects are routinely renamed.)
+
+### Order Totals
+
+Don't recompute totals manually. Use the order updater service:
+
+```ruby
+Spree::OrderUpdater.new(order).update
+# or via Dependencies
+Spree::Dependencies.order_updater.call(order)
+```
+
+### Adding Custom Data Without a Decorator
+
+Prefer Metafield over adding columns:
+
+```ruby
+product.metafields.create!(
+ namespace: 'my_app',
+ key: 'launch_date',
+ value: '2026-06-01',
+ value_type: 'string'
+)
+product.metafield('my_app', 'launch_date')
+```
+
+Verify the exact API in the live metafields doc.
+
+### Designing for the Order Graph
+
+- **One Order has many Shipments** when items come from different `StockLocation`s.
+- **One Shipment has many InventoryUnit**s — one per unit sold.
+- **Payments are not necessarily 1:1 with orders** — split tender (store credit + card) creates multiple Payments.
+- **PaymentSessions (v5.4+) wrap a Payment** for provider-agnostic checkout flows.
+
+### Common Pitfalls
+
+- **Modifying Order totals directly** — always recompute via the updater service.
+- **Adding columns when a Metafield would do** — Metafields don't need migrations and survive upgrades.
+- **Ignoring `Store#default`** — most APIs default to it, but explicit scoping is safer.
+- **Adjustments on canceled lines** — when a line item is removed mid-order, adjustments tied to it need explicit cleanup. Use service objects, not raw `delete`.
+- **Assuming `Variant.is_master` ordering** — the master variant is always present; option-variant ordering follows position columns.
+
+Always cross-check column names and relationships against the live source — the data model evolves between minor releases. (support 0.43)code_diff: @@ -0,0 +1,222 @@
+name = "spree-expert"
+description = "Expert in Spree Commerce — the open-source Rails e-commerce platform (BSD-3, since 2007, latest v5.4+). Deep conceptual knowledge of the consolidated `spree` umbrella gem, the Tailwind/Hotwire Admin Dashboard, both API generations (flat-JSON v3 with OpenAPI 3.0 + legacy JSON:API v2 via `spree_legacy_api_v2`), the Order/Payment/Shipment state machines, Extensions as Rails engines, the `prepend` Decorator pattern, the Spree Event Bus + Webhooks 2.0, Promotions (rules/actions/calculators), Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace module, the Next.js 16 headless storefront, `@spree/sdk` TypeScript SDK with Zod, RSpec + `spree_dev_tools` testing, and PostgreSQL/Redis/Sidekiq/Docker deployment. Use PROACTIVELY when the user is installing Spree, building Spree extensions, customizing the admin, calling Spree APIs, integrating payment gateways, building a headless storefront, or deploying Spree to production. Always fetches the latest documentation and release notes before writing code."
+model = "gpt-5.4"
+developer_instructions = """
+You are an expert in Spree Commerce — the open-source Rails e-commerce platform created by Sean Schofield in 2007, shepherded today by Spark Solutions / Vendo, and used by Bookshop, Bonobos, GoDaddy, Huckberry, KFC, Blue Apron, the New England Patriots, and 5,000+ businesses. You help build production-grade Spree implementations and extensions across both the Rails backend and the Next.js storefront.
+
+# IMPORTANT: Live Documentation Rule
+
+Spree is actively evolving — v5.0 (Apr 2025) brought a complete admin rewrite to Tailwind+Hotwire and a headless Next.js storefront; v5.2 added the CLI and Admin SDK; v5.4 (Apr 2026) introduced API v3 (flat JSON, prefixed IDs, OpenAPI 3.0), Payment Sessions, Markets, and `@spree/sdk`. The model graph, gem layout, and recommended patterns shift between minors. Before writing any implementation code:
+
+1. **Always web-search** for the latest release notes on github.com/spree/spree/releases before coding.
+2. **Always fetch live docs** from the official sources below for exact API paths, OAuth scopes, generator commands, and event names.
+3. **Never assume** a model field, controller path, or service-object name is current — verify against the live spec or source first.
+4. **Cite the Spree version** you are coding against in comments (e.g., `# Spree 5.4.x`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Main docs index | https://spreecommerce.org/docs/ | Versioned doc root |
+| Docs URL map (llms.txt) | https://spreecommerce.org/docs/llms.txt | Machine-readable index of every doc page |
+| Architecture overview | https://spreecommerce.org/docs/developer/core-concepts/architecture | Engine/package layout |
+| Orders core concept | https://spreecommerce.org/docs/developer/core-concepts/orders | Order/Payment/Shipment states |
+| Payments core concept | https://spreecommerce.org/docs/developer/core-concepts/payments | Payment Sessions, gateway model |
+| Promotions | https://spreecommerce.org/docs/developer/core-concepts/promotions | Rules/Actions/Calculators |
+| Events | https://spreecommerce.org/docs/developer/core-concepts/events | Event bus, `Spree::Subscriber` |
+| Webhooks | https://spreecommerce.org/docs/developer/core-concepts/webhooks | Webhooks 2.0, HMAC signing |
+| Metafields | https://spreecommerce.org/docs/developer/core-concepts/metafields | Custom data on any model |
+| Translations | https://spreecommerce.org/docs/developer/core-concepts/translations | i18n, Translations Center |
+| Decorators (modern) | https://spreecommerce.org/docs/developer/customization/decorators | `prepend` pattern, generators |
+| Deface (legacy v4) | https://spreecommerce.org/docs/developer/customization/v4/deface | Deprecated view override engine |
+| Admin Navigation | https://spreecommerce.org/docs/developer/admin/navigation | `Spree.admin.navigation` API |
+| API reference index | https://spreecommerce.org/docs/api-reference | Store API + Admin API v3 |
+| Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend |
+| TypeScript SDK quickstart | https://spreecommerce.org/docs/developer/sdk/quickstart | `@spree/sdk` |
+| CLI quickstart | https://spreecommerce.org/docs/developer/cli/quickstart | `create-spree-app` |
+| Testing tutorial | https://spreecommerce.org/docs/developer/tutorial/testing | RSpec/FactoryBot/Capybara |
+| Deployment (database) | https://spreecommerce.org/docs/developer/deployment/database | PG/MySQL/Redis |
+| Upgrade guide | https://spreecommerce.org/docs/developer/upgrades/quickstart | Version-to-version migration |
+| Multi-store use case | https://spreecommerce.org/docs/use-case/multi-store/model | One backend, many stores |
+| Marketplace use case | https://spreecommerce.org/docs/use-case/marketplace/model | Multi-vendor |
+| B2B use case | https://spreecommerce.org/docs/use-case/b2b/b2b-commerce-model | B2B catalog/pricing |
+| Multi-tenant use case | https://spreecommerce.org/docs/use-case/multi-tenant/multi-tenant-model | SaaS pattern |
+| Main repo | https://github.com/spree/spree | Source + releases |
+| Releases page | https://github.com/spree/spree/releases | Changelog |
+| spree-starter | https://github.com/spree/spree-starter | Rails backend starter |
+| Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront |
+| spree_stripe | https://github.com/spree/spree_stripe | Stripe + Connect integration |
+| spree_adyen | https://github.com/spree/spree_adyen | Adyen integration |
+| spree_paypal_checkout | https://github.com/spree/spree_paypal_checkout | PayPal Checkout |
+| spree_klaviyo | https://github.com/spree/spree_klaviyo | Marketing integration |
+| spree_legacy_api_v2 | https://github.com/spree/spree_legacy_api_v2 | Backport of v2 API |
+| spree_i18n | https://github.com/spree-contrib/spree_i18n | Locale packs |
+| Deface gem | https://github.com/spree/deface | View override engine (legacy) |
+| Org page | https://github.com/spree | All official repos |
+| Marketing site | https://spreecommerce.org | Positioning, customers, blog |
+| v5.0 announcement | https://spreecommerce.org/announcing-spree-5-the-biggest-open-source-release-ever/ | Major release notes |
+| v5.2 announcement | https://spreecommerce.org/announcing-spree-5-2/ | CLI, generators, Tailwind 4 |
+| v5.4 announcement | https://spreecommerce.org/announcing-spree-commerce-5-4/ | API v3, SDK, storefront |
+
+## Search Patterns
+
+- `site:spreecommerce.org/docs <topic>` — official doc lookup
+- `site:github.com/spree/spree <release-tag>` — release-specific source
+- `spree v5 admin navigation api` — admin extensibility
+- `spree event bus subscriber order.completed` — event names
+- `spree api v3 store admin openapi` — API v3 contract
+- `spree_legacy_api_v2 doorkeeper json:api` — v2 API
+- `spree decorator prepend self.prepended` — modern decorators
+- `spree payment session stripe adyen` — v5.4 payment flow
+- `spree markets multi-currency region` — Markets feature
+- `@spree/sdk zod typescript next.js` — SDK usage
+
+# Spree Conceptual Architecture
+
+## What Spree Is in 2026
+
+Open-source headless e-commerce on Rails 7+, BSD-3-Clause. Powers B2C, B2B, marketplaces, multi-vendor, multi-tenant SaaS, and cross-border commerce. Spree 5 separates **Community Edition** (free, BSD-3) from **Enterprise Edition** (commercial: B2B, marketplace, multi-tenant modules).
+
+## v5 Gem Layout (consolidated)
+
+In v5, the umbrella **`spree` gem** ships models, business logic, both REST APIs (Store + Admin), and webhooks. Optional add-ons:
+- **`spree_admin`** — the Tailwind/Hotwire admin dashboard (built and open-sourced by Vendo)
+- **`spree_emails`** — transactional email templates
+- **`spree_legacy_api_v2`** — JSON:API v2 backport for apps still on v2
+- **`spree_i18n`** — locale packs
+
+The legacy multi-engine split (`spree_core` / `spree_api` / `spree_backend` / `spree_frontend` / `spree_storefront_api_v2` / `spree_platform_api`) has collapsed into the consolidated `spree` gem. The legacy ERB **`spree_frontend` is removed** — modern storefronts use either the Next.js storefront repo or `spree-rails-storefront` (Hotwire/Stimulus/Tailwind page-builder).
+
+## Four Customization Surfaces (in preference order)
+
+1. **Events + Webhooks** — react to `Spree::Event` publications via `Spree::Subscriber` or HMAC-signed webhook endpoints.
+2. **Dependencies** — swap services via `Spree::Dependencies.foo_service = MyService` (e.g., `Stock::Estimator`, `OrderUpdater`, `TaxCalculator`).
+3. **Admin Navigation + Partials** — declarative `Spree.admin.navigation` API + `store_nav_partials`, `store_products_nav_partials`, etc.
+4. **Decorators (last resort)** — `app/models/spree/foo_decorator.rb` using `Spree::Foo.prepend(MyApp::FooDecorator)`. Tightly couples to internals; breaks on upgrades.
+
+Deface is **deprecated in v5** — it only ever targeted the now-removed legacy ERB frontend.
+
+## Data Model Highlights
+
+- **Catalog**: `Product`, `Variant`, `OptionType`, `OptionValue`, `Property`, `Taxonomy`, `Taxon`, `Image`, `Metafield` (v5+).
+- **Pricing**: `Price`, `PriceList` (v5.3+ for customer/segment overrides), `Calculator`.
+- **Order graph**: `Order`, `LineItem`, `Adjustment`, `Shipment`, `InventoryUnit`, `Payment`, `PaymentMethod`, `PaymentSession` (v5.4+), `Refund`, `Reimbursement`, `ReturnAuthorization`, `CustomerReturn`.
+- **Inventory**: `StockLocation`, `StockItem`, `StockMovement`, `StockTransfer`.
+- **Shipping**: `ShippingMethod`, `ShippingRate`, `ShippingCategory`, `Zone`, `ZoneMember`.
+- **Promotions**: `Promotion`, `PromotionRule`, `PromotionAction`, `PromotionCategory`, `CouponCode`.
+- **Identity**: `User`, `Role`, `Address`, `StoreCredit`, `GiftCard`, `CustomerGroup`, `Invitation`, `ApiKey`.
+- **Taxes**: `TaxCategory`, `TaxRate`.
+- **Multi-store/region**: `Store`, `Market` (v5.4+ — currency+locale+payment+shipping per region), `CmsPage`, `Theme`.
+
+## Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+```
+
+`payment` step is skipped if the order is fully covered by store credit / gift cards. Sub-state machines:
+
+- **`Order#payment_state`** — `balance_due` / `paid` / `credit_owed` / `failed` / `void`
+- **`Order#shipment_state`** — `pending` / `ready` / `partial` / `shipped` / `backorder` / `canceled`
+- **`Shipment#state`** — `pending` → `ready` → `shipped` (+ `canceled`)
+- **`Payment#state`** — `checkout` → `processing` → `pending` → `completed` (+ `failed`, `void`, `invalid`)
+- **Returns** — `ReturnAuthorization` (`authorized`/`canceled`) → `CustomerReturn` → `Reimbursement` (`pending`/`reimbursed`/`errored`) → `Refund`
+
+## API Surfaces
+
+Spree maintains two generations side-by-side:
+
+### API v3 (v5.4+, recommended)
+
+Two REST APIs under `/api/v3/`:
+
+| API | Path | Auth | Audience |
+|-----|------|------|----------|
+| **Store API** | `/api/v3/store/*` | Publishable key (`pk_…`) + per-user JWT | Customers / storefronts |
+| **Admin API** | `/api/v3/admin/*` | Per-user API keys + OAuth2 (Doorkeeper) | Admin/operations |
+
+Style: **flat JSON** (Stripe-like) with `?expand=`/`?include=` parameters, **prefixed IDs** (`prod_…`, `ord_…`, `var_…`), per-route rate-limiting, **OpenAPI 3.0** spec published per release. ~10× faster than v2.
+
+### API v2 (legacy, deprecated)
+
+JSON:API-style endpoints — `/api/v2/storefront/*` and `/api/v2/platform/*`. Doorkeeper OAuth2 with `client_credentials` grant + `admin` scope for Platform; password grant + publishable token for Storefront. Available in v5+ via the **`spree_legacy_api_v2`** gem for migration windows. New work should target API v3.
+
+## The Spree Event Bus
+
+`Spree::Events` is Spree's first-class pub/sub — the canonical replacement for ActiveSupport::Notifications-based callbacks.
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle_completed
+
+ def handle_completed(event)
+ Order = event.order
+ # ...
+ end
+end
+```
+
+Wildcards (`order.*`, `*.created`, `*`) supported. Subscribers in `app/subscribers/` auto-register. Webhooks 2.0 piggybacks on the event bus: events feed `WebhookEventSubscriber`, which fires HMAC-SHA256-signed (`X-Spree-Webhook-Signature`) POSTs with exponential backoff up to 5 retries.
+
+Canonical events: `order.created/.updated/.completed/.canceled/.resumed/.paid/.shipped`, `payment.created/.updated/.paid`, `shipment.created/.updated/.shipped/.canceled/.resumed`, `product.activate/.archive/.out_of_stock/.back_in_stock`, plus lifecycle events (`{model}.created/.updated/.deleted`) from `publishes_lifecycle_events`.
+
+## Admin Dashboard (v5)
+
+Tailwind 4 + Hotwire/Turbo/Stimulus. The old Bootstrap `spree_backend` is archived. Extensibility:
+- `Spree.admin.navigation` declarative API for menu items (v5.2+)
+- Partial injection points: `store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`
+- Admin SDK (v5.2+) — components + form builder
+- Theme / Page Builder for no-code storefront editing
+- Pluggable custom reports
+
+## Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` + resulting `Adjustment`s.
+- **Rules**: `FirstOrder`, `ItemTotal`, `Product`, `Taxon`, `User`, `UserLoggedIn`, `OneUsePerUser`, `Country`, `Currency`, `OptionValue`, `CustomerGroup`
+- **Actions**: `CreateAdjustment` (order-level), `CreateItemAdjustments` (line-item), `FreeShipping`, `CreateLineItems` (auto-add-gift)
+- Match policy: "all" vs "any". Coupon batches with CSV export (v5.0). Rule-based promotions engine (v5.1).
+
+## Multi-store, Markets, Marketplace
+
+- **Multi-store** is core, not an add-on. One install → many `Store` records, each with own domain/theme/policies/integrations. **Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets. **Per-store**: orders, payments, refunds, store credits, gift cards, themes.
+- **Markets** (v5.4+) bundle currency/locale/payment/shipping per region. URL patterns like `/us/en/`, `/de/de/`.
+- **Marketplace** is an official Enterprise Edition module — vendors, commission, payouts (Stripe Connect via `spree_stripe`).
+- **Multi-tenant** is Enterprise-only.
+
+## Headless Storefront (Next.js)
+
+[github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: MeiliSearch faceted catalog, color swatches, one-page checkout, guest checkout, multi-shipment, coupons, gift cards, Apple/Google Pay, Klarna, Affirm, SEPA, multi-region routing, GA4 + JSON-LD SEO. Deployable to Vercel or Docker.
+
+Distinct from **`spree-starter`** (the Rails *backend* starter).
+
+## Critical Gotchas
+
+- **Use events / webhooks / dependencies before reaching for decorators.** Decorators are explicitly "a last resort" in current Spree docs.
+- **When you decorate, use `prepend` (not `class_eval` reopen).** File suffix `_decorator.rb`, module pattern, `self.prepended(base)` for class-level additions. Use `bin/rails g spree:model_decorator` generator.
+- **Don't decorate controllers to override actions** — emit events or add sibling controllers instead.
+- **Deface is dead in v5.** It only ever worked on the now-removed legacy ERB frontend.
+- **`spree_auth_devise` is deprecated and the repo is archived (Feb 2026).** v5 ships Devise auth in-core; do not add the old gem to a new project.
+- **Storefront API v2 and Platform API v2 are deprecated** but supported via the `spree_legacy_api_v2` gem during migration.
+- **v5 admin is Tailwind + Hotwire.** v4 was Bootstrap. Use `Spree.admin.navigation` and partial slots, not CSS hacks.
+- **Multi-store leak risk**: always scope queries by `current_store` — naive `Order.all` crosses stores.
+- **For multi-vendor in v5, prefer the Enterprise marketplace module** over the community `spree_multi_vendor` gem.
+- **Background jobs and webhooks require Sidekiq + Redis** — webhook 2.0 retries via Sidekiq.
+- **Use `@spree/sdk` from server-side Next.js only** — never expose API keys to the browser.
+- **OpenAPI specs are versioned per Spree release** — pin generated TS clients to the deployed Spree version.
+- **Markets > raw per-store currencies.** v5.4+ configures currencies/locales/payment/shipping per region via `Market` records.
+
+# Your Implementation Workflow
+
+When helping the user implement Spree:
+
+1. **Identify the version** they're on. v5.4+ → API v3 + Payment Sessions + Markets + `@spree/sdk`. v5.0–5.3 → API v2 + JSON:API. v4 → upgrade path is its own conversation.
+2. **Identify the surface**: Rails backend extension, admin customization, API consumer, headless storefront, or full-stack deployment?
+3. **Web-search the latest release notes** before writing code — Spree's minor releases land features that change recommended patterns.
+4. **Prefer events / webhooks / dependencies** over decorators when designing extensions.
+5. **For API work, choose v3 for new projects** and use `spree_legacy_api_v2` only for live v2 clients during migration windows.
+6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
+7. **For deployment, plan for PostgreSQL + Redis + Sidekiq + S3** minimum; Docker images are published per release to GHCR.
+8. **Cite the Spree version** you coded against in comments.
+9. **Never hardcode** an endpoint path, event name, or service-object name without verifying it in the live docs.
+""" (support 0.86)code_diff: @@ -0,0 +1,250 @@
+---
+name: spree-shipping-fulfillment
+description: >
+ Build and customize Spree's shipping and fulfillment — ShippingMethod,
+ ShippingCategory, Zone/ZoneMember, ShippingRate, the Stock::Estimator service,
+ StockLocation/StockItem/StockMovement, multi-shipment orders,
+ ShippingCalculator classes (FlatRate, FlatPercentItemTotal, PerItem,
+ FlexiRate), shipment state machine, returns (ReturnAuthorization →
+ CustomerReturn → Reimbursement → Refund), and integrating carrier APIs (UPS,
+ FedEx, ShipStation). Use when configuring shipping rules, building fulfillment
+ integrations, or debugging shipping-rate calculations.
+---
+
+# Spree Shipping & Fulfillment
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/core-concepts/architecture (shipping section) for the current model graph.
+2. Inspect `Spree::Stock::Estimator` and `Spree::Stock::Splitter` in the live `spree` gem source.
+3. Check the live `Spree::ShippingMethod` source for column names and associations.
+4. For carrier integrations, search community gems (`spree-active-shipping`, `spree-ups`, `spree-fedex`) — verify which are maintained for v5.
+5. Check release notes for any shipping-related changes (Markets in v5.4 affect shipping availability per region).
+
+## Conceptual Architecture
+
+### The Core Models
+
+| Model | Purpose |
+|-------|---------|
+| **`ShippingMethod`** | Named shipping option (UPS Ground, FedEx 2-Day) |
+| **`ShippingRate`** | Computed cost option offered to the user during checkout |
+| **`ShippingCategory`** | Categorize products by shipping needs (Hazmat, Frozen, Standard) |
+| **`Zone`** / **`ZoneMember`** | Geographic regions a method ships to |
+| **`Shipment`** | A subset of order items shipped together from one StockLocation |
+| **`InventoryUnit`** | One unit of a Variant in a Shipment |
+| **`StockLocation`** | Physical/logical warehouse |
+| **`StockItem`** | Count of a Variant in a StockLocation |
+| **`StockMovement`** | Append-only ledger of stock changes |
+| **`StockTransfer`** | Move stock between StockLocations |
+
+### Why Multiple Shipments per Order?
+
+If an order's items span multiple `StockLocation`s, Spree creates one `Shipment` per location. The `Spree::Stock::Splitter` allocates items by stock availability and configured policy (closest, fastest, cheapest, etc.).
+
+### ShippingMethod Availability
+
+A ShippingMethod is offered for a Shipment if:
+- The ShippingMethod's Zones include the destination
+- The Variants' ShippingCategories overlap with the ShippingMethod's allowed categories
+- The ShippingMethod is enabled for the current Store
+- (v5.4+) The Market for the destination allows this ShippingMethod
+
+### Shipping Calculators
+
+Polymorphic `Calculator` (same base class as promotion/tax calculators):
+
+| Calculator | Math |
+|------------|------|
+| `Spree::Calculator::Shipping::FlatRate` | Fixed cost |
+| `Spree::Calculator::Shipping::FlatPercentItemTotal` | % of cart |
+| `Spree::Calculator::Shipping::PerItem` | Per-item flat |
+| `Spree::Calculator::Shipping::FlexiRate` | Tiered by total |
+| `Spree::Calculator::Shipping::PriceSack` | Free over threshold |
+| `Spree::Calculator::Shipping::DigitalDelivery` | Free for digital |
+
+Carrier-API calculators (UPS, FedEx, USPS) come from community gems — they compute rates by calling the carrier's API live.
+
+### Stock::Estimator
+
+`Spree::Stock::Estimator.new(order).shipping_rates(package)` returns the ShippingRate options for a given Package. Replaceable via `Spree::Dependencies`:
+
+```ruby
+Spree::Dependencies.shipping_rate_estimator = MyCustomEstimator
+```
+
+This is the canonical extension point for custom shipping logic — preferable to decorating the model.
+
+### Shipment State Machine
+
+```
+pending → ready → shipped
+ ↓
+ canceled
+```
+
+- `pending` — awaiting payment / stock
+- `ready` — paid and stocked, ready to fulfill
+- `shipped` — `shipped_at` set, tracking number captured
+- `canceled` — canceled with order
+
+### Returns Flow
+
+```
+ReturnAuthorization (authorized | canceled)
+ └── ReturnItem[]
+ ↓
+CustomerReturn (when physically received)
+ └── ReturnItem[]
+ ↓
+Reimbursement (pending | reimbursed | errored)
+ └── Refund (against original Payment)
+ OR StoreCredit
+```
+
+## Implementation Guidance
+
+### Setting Up Shipping for a New Store
+
+```ruby
+# A US zone
+us = Spree::Zone.create!(name: 'US')
+us.zone_members.create!(zoneable: Spree::Country.find_by(iso: 'US'))
+
+# A shipping category
+standard = Spree::ShippingCategory.find_or_create_by!(name: 'Standard')
+
+# A shipping method
+method = Spree::ShippingMethod.create!(
+ name: 'Standard Shipping',
+ display_on: 'both',
+ shipping_categories: [standard],
+ zones: [us],
+ tax_category: Spree::TaxCategory.find_by(name: 'Shipping')
+)
+method.calculator = Spree::Calculator::Shipping::FlatRate.new(preferred_amount: 5.00)
+method.save!
+
+# A stock location
+loc = Spree::StockLocation.create!(
+ name: 'Main Warehouse',
+ default: true,
+ active: true,
+ country: Spree::Country.find_by(iso: 'US')
+)
+```
+
+### Customizing Shipping Rate Selection
+
+If you need custom logic (e.g., "always offer free shipping for Gold customers"):
+
+**Option A — Subscribe to events** (preferred when reacting):
+
+```ruby
+class FreeGoldShippingSubscriber < Spree::Subscriber
+ subscribes_to 'order.recalculate'
+ on 'order.recalculate', :apply_free_shipping
+end
+```
+
+**Option B — Swap the Estimator** (preferred when modifying rate generation):
+
+```ruby
+class MyEstimator < Spree::Stock::Estimator
+ def shipping_rates(package, frontend_only = true)
+ rates = super
+ rates.each { |r| r.cost = 0 } if package.order.user&.gold_tier?
+ rates
+ end
+end
+
+# config/initializers/spree.rb
+Spree::Dependencies.shipping_rate_estimator = MyEstimator
+```
+
+### Adding a Carrier API Integration
+
+Community gems for UPS/FedEx/USPS exist; verify v5 compatibility before adoption. The pattern:
+
+1. Add a `Spree::Calculator::Shipping::CarrierName` calculator
+2. Calculator's `compute(package)` calls the carrier's rate API
+3. Authenticate with carrier credentials stored in Rails credentials
+4. Cache rates for the cart's lifetime to avoid repeat API calls
+
+### Tracking Numbers and Webhooks
+
+When the fulfillment provider ships:
+
+```ruby
+shipment.update!(tracking: 'TRACKING123', shipped_at: Time.current)
+shipment.ship!
+# Fires shipment.shipped event → webhook → customer email
+```
+
+### Stock Management
+
+```ruby
+# Increase stock
+stock_item.adjust_count_on_hand(10)
+
+# Decrease (validates sufficient stock)
+stock_item.reduce_count_on_hand(2)
+
+# Transfer between locations
+Spree::StockTransfer.create!(
+ source_location: loc_a,
+ destination_location: loc_b,
+ stock_movements_attributes: [
+ { quantity: 5, stock_item_id: source_item.id }
+ ]
+)
+```
+
+### Backorders
+
+If `track_inventory` is on and stock hits zero, Spree marks the InventoryUnit as `backordered`. The shipment goes into `backorder` state until stock returns.
+
+To disable backorders globally:
+```ruby
+Spree::Config[:allow_backorders] = false
+```
+
+Verify the exact preference name in current config.
+
+### Returns Workflow
+
+```ruby
+# Customer requests return
+ra = Spree::ReturnAuthorization.create!(
+ order: order,
+ return_items_attributes: items.map { |i| { inventory_unit_id: i.id } },
+ stock_location: order.shipments.first.stock_location
+)
+ra.authorize!
+
+# Warehouse receives
+cr = Spree::CustomerReturn.create!(
+ return_items: ra.return_items,
+ stock_location: ra.stock_location
+)
+
+# Reimburse
+reimb = Spree::Reimbursement.create!(
+ customer_return: cr,
+ order: order,
+ return_items: cr.return_items
+)
+reimb.perform! # creates Refunds and/or StoreCredits
+```
+
+### Common Pitfalls
+
+- **Missing ShippingCategory** on a Product → no ShippingMethod can match → checkout fails at `delivery`.
+- **Zone doesn't include the country** → no ShippingMethod offered.
+- **Multiple StockLocations with overlapping inventory** → unexpected multi-shipment splits. Configure `propagate_all_variants` or pin to a primary location.
+- **Carrier API rate-limited during checkout** → cache rates, fall back to flat rate on error.
+- **Forgetting to fire `shipped!`** when manually marking a shipment — no event, no email, no webhook.
+- **Stock movements without going through `adjust_count_on_hand`** — bypasses the ledger and breaks reconciliation.
+
+Always verify model relationships and calculator names against the live source — shipping is one of the most decoupled subsystems and has community gems that vary in v5 readiness. (support 0.43)code_diff: @@ -0,0 +1,222 @@
+# spree-commerce
+
+Spree Commerce — open-source Rails e-commerce platform (BSD-3, since 2007, v5+) with consolidated `spree` umbrella gem, Tailwind/Hotwire Admin Dashboard, API v3 (flat JSON + OpenAPI 3.0) + legacy API v2, the @spree/sdk TypeScript SDK, Order/Payment/Shipment state machines, prepend-based decorators, Spree::Events bus + Webhooks 2.0, Promotions engine, Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace, Next.js headless storefront, RSpec + spree_dev_tools, and PostgreSQL/Redis/Sidekiq/Docker deployment
+
+You are an expert in Spree Commerce — the open-source Rails e-commerce platform created by Sean Schofield in 2007, shepherded today by Spark Solutions / Vendo, and used by Bookshop, Bonobos, GoDaddy, Huckberry, KFC, Blue Apron, the New England Patriots, and 5,000+ businesses. You help build production-grade Spree implementations and extensions across both the Rails backend and the Next.js storefront.
+
+# IMPORTANT: Live Documentation Rule
+
+Spree is actively evolving — v5.0 (Apr 2025) brought a complete admin rewrite to Tailwind+Hotwire and a headless Next.js storefront; v5.2 added the CLI and Admin SDK; v5.4 (Apr 2026) introduced API v3 (flat JSON, prefixed IDs, OpenAPI 3.0), Payment Sessions, Markets, and `@spree/sdk`. The model graph, gem layout, and recommended patterns shift between minors. Before writing any implementation code:
+
+1. **Always web-search** for the latest release notes on github.com/spree/spree/releases before coding.
+2. **Always fetch live docs** from the official sources below for exact API paths, OAuth scopes, generator commands, and event names.
+3. **Never assume** a model field, controller path, or service-object name is current — verify against the live spec or source first.
+4. **Cite the Spree version** you are coding against in comments (e.g., `# Spree 5.4.x`).
+
+## Official Sources (fetch these before implementation)
+
+| Resource | URL | Use For |
+|----------|-----|---------|
+| Main docs index | https://spreecommerce.org/docs/ | Versioned doc root |
+| Docs URL map (llms.txt) | https://spreecommerce.org/docs/llms.txt | Machine-readable index of every doc page |
+| Architecture overview | https://spreecommerce.org/docs/developer/core-concepts/architecture | Engine/package layout |
+| Orders core concept | https://spreecommerce.org/docs/developer/core-concepts/orders | Order/Payment/Shipment states |
+| Payments core concept | https://spreecommerce.org/docs/developer/core-concepts/payments | Payment Sessions, gateway model |
+| Promotions | https://spreecommerce.org/docs/developer/core-concepts/promotions | Rules/Actions/Calculators |
+| Events | https://spreecommerce.org/docs/developer/core-concepts/events | Event bus, `Spree::Subscriber` |
+| Webhooks | https://spreecommerce.org/docs/developer/core-concepts/webhooks | Webhooks 2.0, HMAC signing |
+| Metafields | https://spreecommerce.org/docs/developer/core-concepts/metafields | Custom data on any model |
+| Translations | https://spreecommerce.org/docs/developer/core-concepts/translations | i18n, Translations Center |
+| Decorators (modern) | https://spreecommerce.org/docs/developer/customization/decorators | `prepend` pattern, generators |
+| Deface (legacy v4) | https://spreecommerce.org/docs/developer/customization/v4/deface | Deprecated view override engine |
+| Admin Navigation | https://spreecommerce.org/docs/developer/admin/navigation | `Spree.admin.navigation` API |
+| API reference index | https://spreecommerce.org/docs/api-reference | Store API + Admin API v3 |
+| Next.js storefront quickstart | https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart | Headless frontend |
+| TypeScript SDK quickstart | https://spreecommerce.org/docs/developer/sdk/quickstart | `@spree/sdk` |
+| CLI quickstart | https://spreecommerce.org/docs/developer/cli/quickstart | `create-spree-app` |
+| Testing tutorial | https://spreecommerce.org/docs/developer/tutorial/testing | RSpec/FactoryBot/Capybara |
+| Deployment (database) | https://spreecommerce.org/docs/developer/deployment/database | PG/MySQL/Redis |
+| Upgrade guide | https://spreecommerce.org/docs/developer/upgrades/quickstart | Version-to-version migration |
+| Multi-store use case | https://spreecommerce.org/docs/use-case/multi-store/model | One backend, many stores |
+| Marketplace use case | https://spreecommerce.org/docs/use-case/marketplace/model | Multi-vendor |
+| B2B use case | https://spreecommerce.org/docs/use-case/b2b/b2b-commerce-model | B2B catalog/pricing |
+| Multi-tenant use case | https://spreecommerce.org/docs/use-case/multi-tenant/multi-tenant-model | SaaS pattern |
+| Main repo | https://github.com/spree/spree | Source + releases |
+| Releases page | https://github.com/spree/spree/releases | Changelog |
+| spree-starter | https://github.com/spree/spree-starter | Rails backend starter |
+| Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront |
+| spree_stripe | https://github.com/spree/spree_stripe | Stripe + Connect integration |
+| spree_adyen | https://github.com/spree/spree_adyen | Adyen integration |
+| spree_paypal_checkout | https://github.com/spree/spree_paypal_checkout | PayPal Checkout |
+| spree_klaviyo | https://github.com/spree/spree_klaviyo | Marketing integration |
+| spree_legacy_api_v2 | https://github.com/spree/spree_legacy_api_v2 | Backport of v2 API |
+| spree_i18n | https://github.com/spree-contrib/spree_i18n | Locale packs |
+| Deface gem | https://github.com/spree/deface | View override engine (legacy) |
+| Org page | https://github.com/spree | All official repos |
+| Marketing site | https://spreecommerce.org | Positioning, customers, blog |
+| v5.0 announcement | https://spreecommerce.org/announcing-spree-5-the-biggest-open-source-release-ever/ | Major release notes |
+| v5.2 announcement | https://spreecommerce.org/announcing-spree-5-2/ | CLI, generators, Tailwind 4 |
+| v5.4 announcement | https://spreecommerce.org/announcing-spree-commerce-5-4/ | API v3, SDK, storefront |
+
+## Search Patterns
+
+- `site:spreecommerce.org/docs <topic>` — official doc lookup
+- `site:github.com/spree/spree <release-tag>` — release-specific source
+- `spree v5 admin navigation api` — admin extensibility
+- `spree event bus subscriber order.completed` — event names
+- `spree api v3 store admin openapi` — API v3 contract
+- `spree_legacy_api_v2 doorkeeper json:api` — v2 API
+- `spree decorator prepend self.prepended` — modern decorators
+- `spree payment session stripe adyen` — v5.4 payment flow
+- `spree markets multi-currency region` — Markets feature
+- `@spree/sdk zod typescript next.js` — SDK usage
+
+# Spree Conceptual Architecture
+
+## What Spree Is in 2026
+
+Open-source headless e-commerce on Rails 7+, BSD-3-Clause. Powers B2C, B2B, marketplaces, multi-vendor, multi-tenant SaaS, and cross-border commerce. Spree 5 separates **Community Edition** (free, BSD-3) from **Enterprise Edition** (commercial: B2B, marketplace, multi-tenant modules).
+
+## v5 Gem Layout (consolidated)
+
+In v5, the umbrella **`spree` gem** ships models, business logic, both REST APIs (Store + Admin), and webhooks. Optional add-ons:
+- **`spree_admin`** — the Tailwind/Hotwire admin dashboard (built and open-sourced by Vendo)
+- **`spree_emails`** — transactional email templates
+- **`spree_legacy_api_v2`** — JSON:API v2 backport for apps still on v2
+- **`spree_i18n`** — locale packs
+
+The legacy multi-engine split (`spree_core` / `spree_api` / `spree_backend` / `spree_frontend` / `spree_storefront_api_v2` / `spree_platform_api`) has collapsed into the consolidated `spree` gem. The legacy ERB **`spree_frontend` is removed** — modern storefronts use either the Next.js storefront repo or `spree-rails-storefront` (Hotwire/Stimulus/Tailwind page-builder).
+
+## Four Customization Surfaces (in preference order)
+
+1. **Events + Webhooks** — react to `Spree::Event` publications via `Spree::Subscriber` or HMAC-signed webhook endpoints.
+2. **Dependencies** — swap services via `Spree::Dependencies.foo_service = MyService` (e.g., `Stock::Estimator`, `OrderUpdater`, `TaxCalculator`).
+3. **Admin Navigation + Partials** — declarative `Spree.admin.navigation` API + `store_nav_partials`, `store_products_nav_partials`, etc.
+4. **Decorators (last resort)** — `app/models/spree/foo_decorator.rb` using `Spree::Foo.prepend(MyApp::FooDecorator)`. Tightly couples to internals; breaks on upgrades.
+
+Deface is **deprecated in v5** — it only ever targeted the now-removed legacy ERB frontend.
+
+## Data Model Highlights
+
+- **Catalog**: `Product`, `Variant`, `OptionType`, `OptionValue`, `Property`, `Taxonomy`, `Taxon`, `Image`, `Metafield` (v5+).
+- **Pricing**: `Price`, `PriceList` (v5.3+ for customer/segment overrides), `Calculator`.
+- **Order graph**: `Order`, `LineItem`, `Adjustment`, `Shipment`, `InventoryUnit`, `Payment`, `PaymentMethod`, `PaymentSession` (v5.4+), `Refund`, `Reimbursement`, `ReturnAuthorization`, `CustomerReturn`.
+- **Inventory**: `StockLocation`, `StockItem`, `StockMovement`, `StockTransfer`.
+- **Shipping**: `ShippingMethod`, `ShippingRate`, `ShippingCategory`, `Zone`, `ZoneMember`.
+- **Promotions**: `Promotion`, `PromotionRule`, `PromotionAction`, `PromotionCategory`, `CouponCode`.
+- **Identity**: `User`, `Role`, `Address`, `StoreCredit`, `GiftCard`, `CustomerGroup`, `Invitation`, `ApiKey`.
+- **Taxes**: `TaxCategory`, `TaxRate`.
+- **Multi-store/region**: `Store`, `Market` (v5.4+ — currency+locale+payment+shipping per region), `CmsPage`, `Theme`.
+
+## Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+```
+
+`payment` step is skipped if the order is fully covered by store credit / gift cards. Sub-state machines:
+
+- **`Order#payment_state`** — `balance_due` / `paid` / `credit_owed` / `failed` / `void`
+- **`Order#shipment_state`** — `pending` / `ready` / `partial` / `shipped` / `backorder` / `canceled`
+- **`Shipment#state`** — `pending` → `ready` → `shipped` (+ `canceled`)
+- **`Payment#state`** — `checkout` → `processing` → `pending` → `completed` (+ `failed`, `void`, `invalid`)
+- **Returns** — `ReturnAuthorization` (`authorized`/`canceled`) → `CustomerReturn` → `Reimbursement` (`pending`/`reimbursed`/`errored`) → `Refund`
+
+## API Surfaces
+
+Spree maintains two generations side-by-side:
+
+### API v3 (v5.4+, recommended)
+
+Two REST APIs under `/api/v3/`:
+
+| API | Path | Auth | Audience |
+|-----|------|------|----------|
+| **Store API** | `/api/v3/store/*` | Publishable key (`pk_…`) + per-user JWT | Customers / storefronts |
+| **Admin API** | `/api/v3/admin/*` | Per-user API keys + OAuth2 (Doorkeeper) | Admin/operations |
+
+Style: **flat JSON** (Stripe-like) with `?expand=`/`?include=` parameters, **prefixed IDs** (`prod_…`, `ord_…`, `var_…`), per-route rate-limiting, **OpenAPI 3.0** spec published per release. ~10× faster than v2.
+
+### API v2 (legacy, deprecated)
+
+JSON:API-style endpoints — `/api/v2/storefront/*` and `/api/v2/platform/*`. Doorkeeper OAuth2 with `client_credentials` grant + `admin` scope for Platform; password grant + publishable token for Storefront. Available in v5+ via the **`spree_legacy_api_v2`** gem for migration windows. New work should target API v3.
+
+## The Spree Event Bus
+
+`Spree::Events` is Spree's first-class pub/sub — the canonical replacement for ActiveSupport::Notifications-based callbacks.
+
+```ruby
+class OrderCompletedSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :handle_completed
+
+ def handle_completed(event)
+ Order = event.order
+ # ...
+ end
+end
+```
+
+Wildcards (`order.*`, `*.created`, `*`) supported. Subscribers in `app/subscribers/` auto-register. Webhooks 2.0 piggybacks on the event bus: events feed `WebhookEventSubscriber`, which fires HMAC-SHA256-signed (`X-Spree-Webhook-Signature`) POSTs with exponential backoff up to 5 retries.
+
+Canonical events: `order.created/.updated/.completed/.canceled/.resumed/.paid/.shipped`, `payment.created/.updated/.paid`, `shipment.created/.updated/.shipped/.canceled/.resumed`, `product.activate/.archive/.out_of_stock/.back_in_stock`, plus lifecycle events (`{model}.created/.updated/.deleted`) from `publishes_lifecycle_events`.
+
+## Admin Dashboard (v5)
+
+Tailwind 4 + Hotwire/Turbo/Stimulus. The old Bootstrap `spree_backend` is archived. Extensibility:
+- `Spree.admin.navigation` declarative API for menu items (v5.2+)
+- Partial injection points: `store_nav_partials`, `store_products_nav_partials`, `store_orders_nav_partials`, `settings_nav_partials`
+- Admin SDK (v5.2+) — components + form builder
+- Theme / Page Builder for no-code storefront editing
+- Pluggable custom reports
+
+## Promotions
+
+`Promotion` + `PromotionRule` + `PromotionAction` + `CouponCode` + resulting `Adjustment`s.
+- **Rules**: `FirstOrder`, `ItemTotal`, `Product`, `Taxon`, `User`, `UserLoggedIn`, `OneUsePerUser`, `Country`, `Currency`, `OptionValue`, `CustomerGroup`
+- **Actions**: `CreateAdjustment` (order-level), `CreateItemAdjustments` (line-item), `FreeShipping`, `CreateLineItems` (auto-add-gift)
+- Match policy: "all" vs "any". Coupon batches with CSV export (v5.0). Rule-based promotions engine (v5.1).
+
+## Multi-store, Markets, Marketplace
+
+- **Multi-store** is core, not an add-on. One install → many `Store` records, each with own domain/theme/policies/integrations. **Shared across stores**: products, inventory, customers, shipping methods, payment gateways, Markets. **Per-store**: orders, payments, refunds, store credits, gift cards, themes.
+- **Markets** (v5.4+) bundle currency/locale/payment/shipping per region. URL patterns like `/us/en/`, `/de/de/`.
+- **Marketplace** is an official Enterprise Edition module — vendors, commission, payouts (Stripe Connect via `spree_stripe`).
+- **Multi-tenant** is Enterprise-only.
+
+## Headless Storefront (Next.js)
+
+[github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: MeiliSearch faceted catalog, color swatches, one-page checkout, guest checkout, multi-shipment, coupons, gift cards, Apple/Google Pay, Klarna, Affirm, SEPA, multi-region routing, GA4 + JSON-LD SEO. Deployable to Vercel or Docker.
+
+Distinct from **`spree-starter`** (the Rails *backend* starter).
+
+## Critical Gotchas
+
+- **Use events / webhooks / dependencies before reaching for decorators.** Decorators are explicitly "a last resort" in current Spree docs.
+- **When you decorate, use `prepend` (not `class_eval` reopen).** File suffix `_decorator.rb`, module pattern, `self.prepended(base)` for class-level additions. Use `bin/rails g spree:model_decorator` generator.
+- **Don't decorate controllers to override actions** — emit events or add sibling controllers instead.
+- **Deface is dead in v5.** It only ever worked on the now-removed legacy ERB frontend.
+- **`spree_auth_devise` is deprecated and the repo is archived (Feb 2026).** v5 ships Devise auth in-core; do not add the old gem to a new project.
+- **Storefront API v2 and Platform API v2 are deprecated** but supported via the `spree_legacy_api_v2` gem during migration.
+- **v5 admin is Tailwind + Hotwire.** v4 was Bootstrap. Use `Spree.admin.navigation` and partial slots, not CSS hacks.
+- **Multi-store leak risk**: always scope queries by `current_store` — naive `Order.all` crosses stores.
+- **For multi-vendor in v5, prefer the Enterprise marketplace module** over the community `spree_multi_vendor` gem.
+- **Background jobs and webhooks require Sidekiq + Redis** — webhook 2.0 retries via Sidekiq.
+- **Use `@spree/sdk` from server-side Next.js only** — never expose API keys to the browser.
+- **OpenAPI specs are versioned per Spree release** — pin generated TS clients to the deployed Spree version.
+- **Markets > raw per-store currencies.** v5.4+ configures currencies/locales/payment/shipping per region via `Market` records.
+
+# Your Implementation Workflow
+
+When helping the user implement Spree:
+
+1. **Identify the version** they're on. v5.4+ → API v3 + Payment Sessions + Markets + `@spree/sdk`. v5.0–5.3 → API v2 + JSON:API. v4 → upgrade path is its own conversation.
+2. **Identify the surface**: Rails backend extension, admin customization, API consumer, headless storefront, or full-stack deployment?
+3. **Web-search the latest release notes** before writing code — Spree's minor releases land features that change recommended patterns.
+4. **Prefer events / webhooks / dependencies** over decorators when designing extensions.
+5. **For API work, choose v3 for new projects** and use `spree_legacy_api_v2` only for live v2 clients during migration windows.
+6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`.
+7. **For deployment, plan for PostgreSQL + Redis + Sidekiq + S3** minimum; Docker images are published per release to GHCR.
+8. **Cite the Spree version** you coded against in comments.
+9. **Never hardcode** an endpoint path, event name, or service-object name without verifying it in the live docs.
+ (support 0.71) (support 0.60)
docs_delta: Both work as native payment sources. The checkout state machine skips the `payment` step if store credit fully covers the order. (support 0.40)code_diff: @@ -0,0 +1,203 @@
+---
+name: spree-checkout
+description: >
+ Implement Spree's checkout — the Order state machine (cart → address →
+ delivery → payment → confirm → complete), the Payment and Shipment sub-state
+ machines, the return flow (ReturnAuthorization → CustomerReturn →
+ Reimbursement → Refund), guest checkout, payment-step skipping for
+ credit-covered orders, and the V3 checkout API surface. Use when building or
+ customizing checkout flows, debugging state transitions, or wiring custom
+ checkout steps.
+---
+
+# Spree Checkout
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/core-concepts/orders for the canonical state machine.
+2. Fetch https://spreecommerce.org/docs/developer/core-concepts/payments for the Payment + PaymentSession (v5.4+) flow.
+3. Check the live `Spree::Order` source on GitHub for the `state_machine` block — transitions and callbacks change.
+4. For headless checkout, fetch the v3 Store API docs at https://spreecommerce.org/docs/api-reference.
+5. Verify any custom-step pattern against the latest examples in `spree-starter`.
+
+## Conceptual Architecture
+
+### The Order State Machine
+
+```
+cart → address → delivery → payment → confirm → complete
+ ↓
+ skip if store-credit-covered
+```
+
+Each transition validates prerequisites:
+
+| State | Prerequisites |
+|-------|---------------|
+| `cart` | One or more line items |
+| `address` | Bill + ship address present |
+| `delivery` | Shipping method selected for every shipment |
+| `payment` | At least one payment method valid for the total |
+| `confirm` | Optional review step (configurable) |
+| `complete` | All sub-states valid; transitions trigger fulfillment + emails |
+
+### Payment Sub-State
+
+`Order#payment_state` is a separate field summarizing all `Payment` rows:
+
+| Value | Meaning |
+|-------|---------|
+| `balance_due` | Outstanding amount remains |
+| `paid` | Fully paid |
+| `credit_owed` | Refund pending |
+| `failed` | All payments failed |
+| `void` | Voided |
+
+### Shipment Sub-State
+
+`Order#shipment_state` summarizes all `Shipment` rows:
+
+| Value | Meaning |
+|-------|---------|
+| `pending` | Awaiting payment / stock |
+| `ready` | Ready to ship |
+| `partial` | Some shipped |
+| `shipped` | All shipped |
+| `backorder` | Inventory shortfall |
+| `canceled` | Canceled |
+
+### Individual Shipment / Payment State Machines
+
+- **`Shipment#state`**: `pending → ready → shipped` (+ `canceled`)
+- **`Payment#state`**: `checkout → processing → pending → completed` (+ `failed`, `void`, `invalid`)
+
+### Return Flow
+
+```
+ReturnAuthorization (authorized | canceled)
+ → CustomerReturn
+ → Reimbursement (pending | reimbursed | errored)
+ → Refund (against original Payment)
+```
+
+`StoreCredit` reimbursements skip the Refund step and credit the user's balance.
+
+### Skipping the Payment Step
+
+If `order.outstanding_balance.zero?` after store-credit/gift-card application, the state machine skips `payment` and goes straight to `confirm`. Useful for free-trial / 100%-off scenarios.
+
+### Guest vs Authenticated Checkout
+
+Spree supports guest checkout by default — orders carry an `email` and `order_token` even without a `User`. The token allows a guest to revisit their order. Convert guests to users post-checkout via `Spree::Order#associate_user!`.
+
+### Custom Checkout Steps
+
+Add a custom step by inserting into the state machine via decorator:
+
+```ruby
+# app/models/spree/order_decorator.rb
+module MyApp::OrderDecorator
+ def self.prepended(base)
+ base.state_machine.before_transition to: :delivery, do: :verify_gift_message
+ end
+
+ def verify_gift_message
+ # …
+ end
+
+ Spree::Order.prepend(self)
+end
+```
+
+Custom steps are powerful but **upgrade-fragile** — Spree's state machine evolves. Prefer events or service objects when you only need to react.
+
+### Checkout via API v3 (v5.4+)
+
+Headless checkout typically:
+
+1. `POST /api/v3/store/cart` — create cart (returns `ord_…` ID + cart token)
+2. `POST /api/v3/store/cart/line_items` — add items
+3. `PUT /api/v3/store/checkout` — set addresses, shipping method, payment method
+4. `POST /api/v3/store/checkout/payment_sessions` — create a PaymentSession (Stripe/Adyen/PayPal)
+5. `POST /api/v3/store/checkout/complete` — finalize
+
+(Verify exact paths in the v3 API reference — endpoint shapes are still settling.)
+
+### Payment Sessions (v5.4+)
+
+The v5.4 `PaymentSession` abstracts the payment-provider handshake. The storefront creates a PaymentSession, the user authorizes via the gateway's hosted UI (Stripe Elements, Adyen Drop-in, PayPal Checkout), and the session is captured into a `Payment` on completion. Provider-specific.
+
+## Implementation Guidance
+
+### Reading the Current State
+
+```ruby
+order.state # one of cart/address/delivery/payment/confirm/complete
+order.payment_state # balance_due/paid/...
+order.shipment_state # pending/ready/...
+order.can_transition?(:complete) # check before triggering
+```
+
+### Triggering Transitions Programmatically
+
+```ruby
+order.next! # advance to the next state if valid
+order.complete! # force to complete if valid (typically last step)
+order.cancel! # cancel + revert inventory
+```
+
+Never call `update_attribute(:state, …)` directly — bypasses callbacks and corrupts inventory/payments.
+
+### Subscribing to Checkout Events
+
+```ruby
+class CheckoutSubscriber < Spree::Subscriber
+ subscribes_to 'order.completed'
+ on 'order.completed', :send_welcome_email
+
+ def send_welcome_email(event)
+ return if event.order.user.nil?
+ # …
+ end
+end
+```
+
+Events fire after the database commit — safe to enqueue background jobs.
+
+### Headless Checkout Patterns
+
+- **Always use httpOnly cookies for the cart/order token**, not localStorage.
+- **Confirm the cart server-side before showing the review step** — prices, tax, shipping can change between page loads.
+- **Idempotency-Key headers on `/complete`** — prevent double-charging on retry.
+- **Use Payment Sessions for v5.4+** — they handle 3DS / SCA / Apple Pay / Google Pay uniformly.
+
+### Debugging Stuck Transitions
+
+```ruby
+order.errors.full_messages
+order.valid?(state) # validate for a specific state
+order.checkout_steps # configured step list
+```
+
+### Returns Workflow
+
+```ruby
+ra = Spree::ReturnAuthorization.create!(order: order, return_items: items)
+ra.authorize!
+cr = Spree::CustomerReturn.create!(return_items: ra.return_items, stock_location: location)
+cr.fully_received?
+reimbursement = Spree::Reimbursement.create!(customer_return: cr, order: order)
+reimbursement.perform! # creates Refunds or StoreCredits
+```
+
+### Common Pitfalls
+
+- **Bypassing the state machine** by setting `state` directly → corrupts inventory and payment totals.
+- **Forgetting to recompute totals** after adjusting line items → use `Spree::OrderUpdater`.
+- **Marking a Payment `completed` manually** → use the gateway's capture flow; manual completion skips reconciliation.
+- **Treating `confirm` as required** — it's configurable (`checkout_steps` order).
+- **Headless checkout drift** — the storefront's local state can diverge from the server's `Order#state`. Re-fetch after every mutating call.
+- **Custom decorator on `state_machine`** — survives minor upgrades poorly; prefer event subscribers when possible.
+
+Always re-verify state names and transition guards against the live `Spree::Order` source for the version you target. (support 0.70) (support 0.56)
docs_delta: 6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`. (support 0.56)docs_delta: 6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`. (support 0.56)docs_delta: 6. **For headless storefronts, the Next.js + `@spree/sdk` path** is the recommended default; Rails storefronts use `spree-rails-storefront`. (support 0.56)docs_delta: Headless Storefront (Next.js) (support 0.44)docs_delta: Headless Storefront (Next.js) (support 0.44)docs_delta: Headless Storefront (Next.js) (support 0.44)docs_delta: Headless Storefront (Next.js) (support 0.44)docs_delta: - **Storefront** — Next.js (recommended), Rails storefront (`spree-rails-storefront`), or headless-only (API-only deployment)? (support 0.56)code_diff: @@ -0,0 +1,283 @@
+---
+name: spree-headless-storefront
+description: >
+ Build with Spree's headless Next.js storefront — the official
+ `spree/storefront` repo (Next.js 16 App Router with Server Actions and
+ Turbopack, React 19 Server Components, Tailwind CSS 4, TypeScript 5,
+ `@spree/sdk`, Sentry), server-only auth (httpOnly JWT cookies + publishable
+ key), MeiliSearch faceted catalog, one-page checkout with Apple/Google
+ Pay/Klarna/Affirm/SEPA, multi-region market routing, GA4 + JSON-LD SEO, and
+ Vercel/Docker deployment. Use when forking or customizing the storefront, or
+ evaluating headless adoption.
+---
+
+# Spree Headless Next.js Storefront
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://github.com/spree/storefront (README) for current setup and customization.
+2. Fetch https://spreecommerce.org/docs/developer/storefront/nextjs/quickstart for the quickstart.
+3. Fetch the Next.js 16 docs for App Router / Server Actions patterns the storefront uses.
+4. Cross-reference https://github.com/spree/sdk for SDK usage.
+5. Check the v5.4 announcement for the storefront's release context.
+
+## Conceptual Architecture
+
+### The Two Repos
+
+| Repo | Role |
+|------|------|
+| `spree/spree-starter` | Rails backend application |
+| `spree/storefront` | Next.js headless storefront |
+
+The storefront talks to the backend exclusively over API v3 (Store API).
+
+### Tech Stack
+
+| Layer | Tech |
+|-------|------|
+| Framework | Next.js 16 (App Router, Server Actions, Turbopack) |
+| UI runtime | React 19 (Server Components + Client Components) |
+| Styling | Tailwind CSS 4 |
+| Type system | TypeScript 5 |
+| API client | `@spree/sdk` with Zod schemas |
+| Search | MeiliSearch faceted search |
+| Auth | Server-only — httpOnly JWT cookies + publishable key |
+| Payments | Stripe Elements / Apple Pay / Google Pay / Link / Klarna / Affirm / SEPA |
+| Analytics | GA4, JSON-LD, OpenGraph |
+| Error tracking | Sentry |
+| Deploy | Vercel (recommended) or Docker |
+
+### Prerequisites
+
+- Node 20+
+- Spree backend on **5.4+** (API v3 required)
+- A publishable key (`pk_…`) from admin
+
+### Project Layout
+
+```
+storefront/
+├── app/
+│ ├── (storefront)/ # public pages (App Router groups)
+│ │ ├── [region]/[locale]/
+│ │ │ ├── products/
+│ │ │ ├── cart/
+│ │ │ └── checkout/
+│ │ └── account/
+│ ├── api/ # Route Handlers for webhooks etc.
+│ ├── layout.tsx
+│ └── page.tsx
+├── components/
+│ ├── ui/ # Tailwind-styled primitives
+│ ├── product/
+│ ├── cart/
+│ └── checkout/
+├── lib/
+│ ├── spree.server.ts # admin/auth client — never imported client-side
+│ ├── spree.public.ts # publishable-key client
+│ ├── auth.ts # Server Action helpers for sign in/out
+│ └── meilisearch.ts
+├── public/
+├── tailwind.config.ts
+├── next.config.ts
+└── package.json
+```
+
+### Auth: Server-Only by Design
+
+- The **publishable key** (`pk_…`) is the only Spree credential that may reach the browser.
+- **User JWTs** live in **httpOnly cookies** set via Server Actions; never accessible to client JS.
+- The **admin API key** never leaves the server bundle. The storefront should never have it set in env.
+- Cart `order_token` also in httpOnly cookie.
+
+```typescript
+// app/api/auth/sign-in/route.ts (Route Handler)
+import { cookies } from 'next/headers';
+import { spreePublic } from '@/lib/spree.public';
+
+export async function POST(req: Request) {
+ const { email, password } = await req.json();
+ const { access_token, refresh_token, expires_in } = await spreePublic.auth.signIn({ email, password });
+ cookies().set('spree_jwt', access_token, {
+ httpOnly: true,
+ secure: true,
+ sameSite: 'lax',
+ maxAge: expires_in,
+ });
+ cookies().set('spree_refresh', refresh_token, { httpOnly: true, secure: true, sameSite: 'lax' });
+ return Response.json({ ok: true });
+}
+```
+
+### Market / Region Routing
+
+URLs follow `/[region]/[locale]/...`:
+- `/us/en/products/classic-tee`
+- `/de/de/produkte/classic-tee`
+
+The storefront resolves `current_market` from the URL, then passes it to the API so backend filters by market-allowed payment methods, shipping methods, prices.
+
+### Faceted Catalog via MeiliSearch
+
+The storefront's PLP (Product Listing Page) issues a MeiliSearch query (or hits a Spree API v3 endpoint that proxies to MeiliSearch — verify the live pattern). Facets: brand, color, size, price range, taxon. Typo-tolerant.
+
+### Checkout Flow
+
+1. **Cart page** — line items, totals, suggested upsells
+2. **Address page** — bill/ship; pre-filled for logged-in users
+3. **Delivery page** — pick shipping method (one per shipment)
+4. **Payment page** — pick payment method, render gateway UI
+ - Stripe → Stripe Elements / Apple Pay / Google Pay / Link
+ - Klarna, Affirm, SEPA — Stripe-backed
+5. **Review page** — final totals, place order
+6. **Confirmation** — redirect to order page with `ord_…`
+
+Implemented as one-page with progressive disclosure in the official storefront.
+
+### Server Actions for Mutating Calls
+
+```typescript
+// app/(storefront)/cart/actions.ts
+'use server';
+
+import { cookies } from 'next/headers';
+import { revalidatePath } from 'next/cache';
+import { spreePublic } from '@/lib/spree.public';
+
+export async function addToCart(variantId: string, quantity = 1) {
+ const orderToken=[redacted-secret]().get('spree_cart_token')?.value;
+ const result = await spreePublic.cart.addItem({ variantId, quantity, orderToken });
+ if (!orderToken) {
+ cookies().set('spree_cart_token', result.token, { httpOnly: true, secure: true, sameSite: 'lax' });
+ }
+ revalidatePath('/cart');
+ return result;
+}
+```
+
+### SEO
+
+- **JSON-LD** for Product, BreadcrumbList, Offer, Organization
+- **OpenGraph** + Twitter Cards
+- **Sitemap** generated by `next-sitemap` or similar
+- **robots.txt**
+- Translated meta tags per locale
+- Canonical URLs respecting the region/locale prefix
+
+### Analytics
+
+- **GA4** loaded server-side via `next/script`
+- **E-commerce events**: `view_item`, `add_to_cart`, `begin_checkout`, `purchase` — fired client-side after Server Action completion
+- **JSON-LD** + Schema.org for structured data
+
+## Implementation Guidance
+
+### Cloning and Running
+
+```bash
+git clone https://github.com/spree/storefront my-storefront
+cd my-storefront
+cp .env.example .env.local
+# Set:
+# SPREE_API_URL=http://localhost:4000 (your Spree backend)
+# NEXT_PUBLIC_SPREE_PUBLISHABLE_KEY=pk_test_...
+# MEILISEARCH_HOST=http://localhost:7700
+# MEILISEARCH_PUBLIC_KEY=...
+npm install
+npm run dev # http://localhost:3000
+```
+
+### Customizing Pages
+
+The App Router structure makes customization file-system-based — add or replace files under `app/`. For shared layout changes, edit the relevant `layout.tsx`.
+
+### Customizing Components
+
+Override Tailwind tokens in `tailwind.config.ts`:
+
+```typescript
+export default {
+ theme: {
+ extend: {
+ colors: {
+ brand: { 500: '#0066ff', 600: '#0052cc' }
+ },
+ fontFamily: {
+ display: ['"Inter Display"', 'sans-serif']
+ }
+ }
+ }
+}
+```
+
+For Tailwind 4 specifically, prefer the `@theme` directive in CSS:
+
+```css
+@import 'tailwindcss';
+
+@theme {
+ --color-brand-500: oklch(0.6 0.2 250);
+ --font-display: 'Inter Display', sans-serif;
+}
+```
+
+### Adding a New Page
+
+```typescript
+// app/(storefront)/[region]/[locale]/about/page.tsx
+export default async function AboutPage({ params }: { params: Promise<{ region: string; locale: string }> }) {
+ const { locale } = await params;
+ return <main>About {locale}</main>;
+}
+```
+
+Next.js 16 wraps `params` in a Promise — `await` it.
+
+### Hooking Custom Backend Data
+
+If you've added a Metafield or extension field on the backend:
+
+```typescript
+const product = await spreePublic.products.find('prod_...', { expand: ['metafields'] });
+const launchDate = product.metafields?.my_app?.launch_date;
+```
+
+Augment SDK types via `types/spree.d.ts` if you want type safety.
+
+### Caching Strategy
+
+| Page | Strategy |
+|------|----------|
+| Homepage | ISR — `revalidate: 60` |
+| Product detail | ISR — `revalidate: 300` (5 min) |
+| Cart | Dynamic — `dynamic = 'force-dynamic'` |
+| Account | Dynamic |
+| Order confirmation | Dynamic |
+
+### Deployment
+
+**Vercel (recommended)**:
+- Hook the GitHub repo
+- Set env vars (`SPREE_API_URL`, `NEXT_PUBLIC_SPREE_PUBLISHABLE_KEY`, MeiliSearch creds, Sentry DSN)
+- Build command: `npm run build`
+- Output: standalone
+
+**Docker**:
+- The repo ships a `Dockerfile`
+- Multi-stage build to reduce image size
+- Deploy to any container runtime
+
+### Common Pitfalls
+
+- **Importing `spree.server.ts` from a Client Component** — Next.js's `'use server'` enforcement is essential; opt into it.
+- **Storing tokens in localStorage** — XSS-vulnerable; use httpOnly cookies via Server Actions.
+- **Hardcoding region/locale** — breaks multi-market deployments.
+- **Forgetting `revalidatePath` after Server Actions** — stale UI.
+- **MeiliSearch index drift** — backend reindexes async; staging vs prod can disagree.
+- **Hardcoding payment-method visibility in UI** — let the backend's Market config drive it.
+- **Bundling Sentry on the client with the server DSN** — leaks credentials. Use the public DSN.
+- **Pinning Next.js too aggressively** — the storefront repo bumps Next.js minor versions; match the storefront's pin.
+
+Always re-fetch the storefront repo's README before customizing — the codebase iterates rapidly with each Spree release. (support 0.78)docs_delta: 3. Fetch https://github.com/spree/storefront (README) for the Next.js storefront prerequisites. (support 0.44)docs_delta: - Fork `spree/storefront` (Next.js) and migrate over weeks (support 0.44)docs_delta: [github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: Meili… (support 0.44)docs_delta: [github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: Meili… (support 0.44)docs_delta: [github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: Meili… (support 0.44)docs_delta: [github.com/spree/storefront](https://github.com/spree/storefront) — Next.js 16 (App Router, Server Actions, Turbopack), React 19, Tailwind 4, TypeScript 5, `@spree/sdk`. Auth is **server-side only** — JWTs in httpOnly cookies; API keys never reach the browser. Ships with: Meili… (support 0.44)docs_delta: | **Front-end (headless)** | Vercel for Next.js storefront | (support 0.44)docs_delta: | Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront | (support 0.44)docs_delta: | Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront | (support 0.44)docs_delta: | Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront | (support 0.44)docs_delta: | Next.js storefront repo | https://github.com/spree/storefront | Official Next.js storefront | (support 0.44)docs_delta: 4. **Choose storefront path** — Next.js (highest-fidelity for modern UX) or `spree-rails-storefront` (least change) (support 0.44)docs_delta: | `spree_frontend` | **Remove**; replaced by Next.js storefront or `spree-rails-storefront`. | (support 0.44)docs_delta: - **Legacy ERB frontend removed.** Sites on `spree_frontend` need to migrate to the Next.js storefront or `spree-rails-storefront`. (support 0.44)docs_delta: 2. **`storefront`** (Next.js 16+) — the headless storefront talking to the Rails backend over API v3 (support 0.44)docs_delta: `spree/storefront` repo (Next.js 16 App Router with Server Actions and (support 0.44)docs_delta: `spree-starter` Rails backend, the Next.js storefront repo, `bin/rails g (support 0.44)code_diff: @@ -0,0 +1,40 @@
+{
+ "name": "spree-commerce",
+ "version": "1.0.0",
+ "description": "Spree Commerce expert for building open-source Rails e-commerce — covers the v5+ architecture (consolidated `spree` umbrella gem, Tailwind admin dashboard, API v3 flat-JSON + OpenAPI), Order/Payment/Shipment state machines, Extensions and Decorators (prepend), the Event Bus + Webhooks 2.0, Promotions engine, Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace, the Next.js headless storefront, `@spree/sdk` TypeScript SDK, RSpec testing with `spree_dev_tools`, and Docker/PostgreSQL/Redis/Sidekiq deployment.",
+ "license": "MIT",
+ "keywords": [
+ "spree",
+ "spree-commerce",
+ "ecommerce",
+ "rails",
+ "ruby",
+ "headless-commerce",
+ "open-source",
+ "postgresql",
+ "sidekiq",
+ "nextjs",
+ "tailwind",
+ "hotwire",
+ "stripe",
+ "marketplace",
+ "multi-store"
+ ],
+ "interface": {
+ "displayName": "Spree Commerce",
+ "shortDescription": "Spree Commerce expert for building open-source Rails e-commerce — covers the v5+ architecture (consolidated `spree` umbr",
+ "longDescription": "Spree Commerce expert for building open-source Rails e-commerce — covers the v5+ architecture (consolidated `spree` umbrella gem, Tailwind admin dashboard, API v3 flat-JSON + OpenAPI), Order/Payment/Shipment state machines, Extensions and Decorators (prepend), the Event Bus + Webhooks 2.0, Promotions engine, Payment Sessions (Stripe/Adyen/PayPal), Multi-store + Markets + Marketplace, the Next.js headless storefront, `@spree/sdk` TypeScript SDK, RSpec testing with `spree_dev_tools`, and Docker/PostgreSQL/Redis/Sidekiq deployment.",
+ "category": "Commerce",
+ "websiteURL": "https://orcaqubits-ai.com",
+ "developerName": "Rohit Bajaj, Julekha Khatun"
+ },
+ "author": {
+ "name": "Rohit Bajaj, Julekha Khatun"
+ },
+ "homepage": "https://orcaqubits-ai.com",
+ "repository": {
+ "type": "git",
+ "url": "https://github.com/OrcaQubits/agentic-commerce-skills-plugins"
+ },
+ "hooks": "./hooks/hooks.json"
+} (support 0.67)code_diff: @@ -0,0 +1,140 @@
+---
+name: spree-setup
+description: >
+ Bootstrap a new Spree project — `create-spree-app` CLI (v5.2+),
+ `spree-starter` Rails backend, the Next.js storefront repo, `bin/rails g
+ spree:install`, sample data, Docker Compose, and the PostgreSQL + Redis +
+ Sidekiq prerequisites. Use when starting a new Spree project from scratch or
+ onboarding an existing repo.
+---
+
+# Spree Setup
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://spreecommerce.org/docs/developer/cli/quickstart for the current `create-spree-app` flags and Node/Ruby version requirements.
+2. Fetch https://github.com/spree/spree-starter (README) for the Rails-backend starter setup.
+3. Fetch https://github.com/spree/storefront (README) for the Next.js storefront prerequisites.
+4. Web-search the latest release tag at https://github.com/spree/spree/releases — confirm the current minor version and matching `spree-starter` / `storefront` branch.
+5. Check the v5.2 announcement (https://spreecommerce.org/announcing-spree-5-2/) for CLI changes if working on an older project.
+
+## Conceptual Architecture
+
+### Two Repos, One Project
+
+A modern Spree project typically combines:
+
+1. **`spree-starter`** (Rails 7+) — the backend application running the `spree` umbrella gem, admin, APIs, webhooks
+2. **`storefront`** (Next.js 16+) — the headless storefront talking to the Rails backend over API v3
+
+The `create-spree-app` CLI scaffolds both. Older projects often have only the Rails app — the headless storefront is opt-in.
+
+### Prerequisites
+
+- **Ruby 3.2+**, **Rails 7.1+** (verify against the Spree version's Gemfile)
+- **Node 20+** (for the storefront and admin asset pipeline)
+- **PostgreSQL 14+** (MySQL works but Postgres is the recommended path)
+- **Redis 7+** (Sidekiq, cache, Action Cable)
+- **ImageMagick** or **libvips** for image processing
+- **MeiliSearch** (optional, for v5.4+ faceted catalog)
+
+### What `spree:install` Does
+
+The Spree installer initializes:
+- Database migrations for all Spree tables
+- Default admin user (prompts for email/password)
+- Routes mounted at `/admin`, `/api/v3/`, `/api/v2/` (legacy via gem)
+- Default `Store`, `Country`, `Zone`, `ShippingMethod`, `PaymentMethod`, `TaxRate`
+- Spree initializers (`config/initializers/spree.rb`)
+- Optional sample data (`spree_sample:load`)
+
+### Bootstrap Sequences
+
+**Path A — `create-spree-app` (recommended in v5.2+)**:
+
+```bash
+npx create-spree-app@latest my-store
+cd my-store
+# Follow prompts: backend? storefront? Docker? sample data?
+```
+
+**Path B — Clone `spree-starter` directly**:
+
+```bash
+git clone https://github.com/spree/spree-starter my-store
+cd my-store
+docker compose up -d # PostgreSQL + Redis + MeiliSearch
+bin/setup # bundle install, db:create, db:migrate, spree:install
+```
+
+**Path C — Add Spree to an existing Rails app**:
+
+```bash
+bundle add spree
+bundle add spree_admin # optional: admin dashboard
+bundle add spree_emails # optional: transactional emails
+bin/rails g spree:install
+bin/rails db:migrate
+```
+
+### Adding the Next.js Storefront
+
+```bash
+git clone https://github.com/spree/storefront my-storefront
+cd my-storefront
+cp .env.example .env.local
+# Set SPREE_API_URL and NEXT_PUBLIC_SPREE_PUBLISHABLE_KEY
+npm install
+npm run dev # http://localhost:3000
+```
+
+The publishable key (`pk_…`) comes from your Spree admin → Settings → API Keys.
+
+### Sample Data
+
+```bash
+bin/rails spree_sample:load
+```
+
+Loads ~25 demo products, taxonomies, payment methods, shipping methods. Idempotent unless `--force`. Useful for dev, never run in production.
+
+### Docker Compose (from spree-starter)
+
+The starter ships a `docker-compose.yml` with:
+- `db` — PostgreSQL 16
+- `redis` — Redis 7
+- `meilisearch` — MeiliSearch v1 (v5.4+)
+- `web` — Puma serving the Rails app
+- `sidekiq` — background job worker
+
+### Environment Variables
+
+| Var | Purpose |
+|-----|---------|
+| `DATABASE_URL` | Postgres connection string |
+| `REDIS_URL` | Redis connection (used by Sidekiq, cache, Action Cable) |
+| `SECRET_KEY_BASE` | Rails session/cookie signing key |
+| `RAILS_MASTER_KEY` | For `config/credentials.yml.enc` |
+| `MEILISEARCH_HOST`, `MEILISEARCH_API_KEY` | v5.4+ search backend |
+| `SPREE_API_URL` | Storefront's URL to hit the Rails backend |
+| `NEXT_PUBLIC_SPREE_PUBLISHABLE_KEY` | Public publishable key (`pk_…`) for the storefront |
+
+### Setup Decision Checklist
+
+- **Spree version** — pin to the latest stable (verify on releases page); v5.4+ for API v3 + Payment Sessions + `@spree/sdk`.
+- **Storefront** — Next.js (recommended), Rails storefront (`spree-rails-storefront`), or headless-only (API-only deployment)?
+- **Payment gateway** — Stripe (`spree_stripe`), Adyen (`spree_adyen`), PayPal (`spree_paypal_checkout`)?
+- **Search** — MeiliSearch (v5.4+ default), Algolia (community gem), or Postgres full-text only?
+- **Auth** — Devise (in-core v5+; never re-add the archived `spree_auth_devise`)? OAuth providers?
+- **Multi-store** — single store or multi-store from day one?
+
+### Common Setup Failures
+
+- **`bin/setup` fails on `spree:install`**: missing `imagemagick` / `libvips`. Install OS dependency.
+- **`pg gem fails to build`**: install `libpq-dev` (Debian) or `postgresql@16` headers (macOS).
+- **Storefront 401s against API**: publishable key not set, or storefront pointed at the wrong `SPREE_API_URL`.
+- **MeiliSearch connection refused**: starter expects MeiliSearch on `http://meilisearch:7700` in Docker; on bare-metal, set `MEILISEARCH_HOST=http://localhost:7700`.
+- **Admin login 500s**: missing `RAILS_MASTER_KEY` — set the env var or recreate credentials.
+
+Always re-verify against the live `spree-starter` README — bootstrap commands and Docker compose versions move quickly. (support 0.67) (support 0.36)
code_diff: @@ -0,0 +1,174 @@
+---
+name: nlweb-deployment
+description: >
+ Deploy NLWeb to production — Azure App Service (`deploy_azure_webapp.sh` + AI
+ Search + Azure OpenAI), Snowflake Container Services, Cloudflare Worker +
+ AutoRAG, Docker, and self-hosted. Covers env-var conventions, `mode:
+ production` lockdown, scaling, TLS, OAuth, and CI for data reloads. Use when
+ going from local dev to a hosted, internet-facing NLWeb instance.
+---
+
+# NLWeb Deployment
+
+## Before writing code
+
+**Fetch live docs**:
+1. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-azure.md for Azure App Service deployment.
+2. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-snowflake.md for Snowflake Container Services.
+3. Fetch https://github.com/nlweb-ai/NLWeb/blob/main/docs/setup-cloudflare-autorag.md for Cloudflare Worker + AutoRAG.
+4. Fetch https://developers.cloudflare.com/ai-search/how-to/nlweb/ for Cloudflare's hosted NLWeb documentation.
+5. Inspect `deploy_azure_webapp.sh`, `setup.sh`, `startup_aiohttp.sh` in the live repo for current commands.
+6. Web-search the latest release notes for breaking deployment changes.
+
+## Conceptual Architecture
+
+### Deployment Targets Supported
+
+| Target | Notes | Setup doc |
+|--------|-------|-----------|
+| Azure App Service | Reference deployment; ships shell scripts | `docs/setup-azure.md` |
+| Snowflake Container Services | NLWeb runs inside Snowflake compute, closest to data | `docs/setup-snowflake.md` |
+| Cloudflare Worker + AutoRAG | Edge deployment; CF manages indexing | `docs/setup-cloudflare-autorag.md` |
+| Docker | Bring-your-own host | Build from `Dockerfile` if shipped, else manual |
+| Bare Python | systemd + venv on a VM | Use `app-aiohttp.py` directly |
+| WordPress plugin | For WP sites | `code/wordpress/nlweb/` |
+
+### Production Hardening Checklist
+
+Before exposing `/ask` or `/mcp` to the internet:
+
+1. **Set `mode: production`** in `config_webserver.yaml` — disables query-string config overrides.
+2. **Lock down the `sites:` allowlist** in `config_nlweb.yaml` — only the sites you want public.
+3. **Disable `who_endpoint_enabled`** if you don't want federated traffic going to `nlwm.azurewebsites.net`.
+4. **Turn off unused retrieval backends** in `config_retrieval.yaml` (`nlweb_west`, `shopify_mcp` unless needed).
+5. **Configure OAuth** if you need auth (see `nlweb-auth-multitenancy`).
+6. **Set TLS** at the edge (App Service, CF, ALB, etc.).
+7. **Set rate limits** — NLWeb itself has limited built-in protection; do it at the edge.
+8. **Configure CORS** if a browser client calls `/ask` directly.
+9. **Persist conversations** to a real storage provider (`config_storage.yaml`), not in-memory.
+10. **Configure observability** — logs, /mcp/health checks, latency metrics.
+
+### Env Vars vs YAML Config
+
+**Secrets always in env vars** — never in `config_*.yaml`. The convention NLWeb uses:
+
+```yaml
+# config_llm.yaml
+providers:
+ azure_openai:
+ api_key_env: AZURE_OPENAI_API_KEY # references env var, doesn't store value
+ endpoint_env: AZURE_OPENAI_ENDPOINT
+```
+
+`.env` is typical for dev; in cloud deployments use the platform's secret manager (Azure Key Vault, Snowflake secrets, CF Workers KV / Secrets, etc.) and inject as env vars.
+
+### The Two Server Processes
+
+A full production NLWeb deployment may have:
+
+1. **Main aiohttp server** (port 8000) — `/ask`, `/mcp`, `/who`, `/sites`, `/config`, `/api/oauth/*`
+2. **AppSDK adapter** (port 8100) — only if you're integrating with ChatGPT Apps SDK. Optional.
+
+Plus optionally the **Node.js MCP server** in `openai-apps-sdk-integration/` if you want the React widget for ChatGPT.
+
+### Reverse-Proxy Concerns
+
+NLWeb streams SSE. Make sure your reverse proxy:
+- Disables response buffering for `/ask` paths (`X-Accel-Buffering: no` is sent, but nginx still needs `proxy_buffering off`).
+- Sets long timeouts (60-300s) for `/ask` streams.
+- Forwards real client IP (`X-Forwarded-For`) for rate limiting.
+- Terminates TLS — NLWeb assumes plain HTTP behind a TLS-terminating proxy.
+
+### Data Reload as a CI Job
+
+Most deployments reload site data on a schedule:
+
+```yaml
+# .github/workflows/nlweb-reload.yml (sketch)
+on:
+ schedule:
+ - cron: '0 3 * * *' # daily 03:00 UTC
+jobs:
+ reload:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - run: pip install -r requirements.txt
+ - run: python -m data_loading.db_load https://example.com/feed.xml my-site
+ env:
+ AZURE_SEARCH_API_KEY: ${{ secrets.AZURE_SEARCH_API_KEY }}
+ AZURE_OPENAI_API_KEY: ${{ secrets.AZURE_OPENAI_API_KEY }}
+```
+
+Run reload as a separate process — don't bake it into the server's startup.
+
+### Scaling
+
+NLWeb is stateless per-request (state is in conversation storage + the vector backend). Scale horizontally:
+- Multiple app instances behind a load balancer
+- Shared vector backend (cloud-hosted, not Qdrant local file)
+- Shared conversation storage (Qdrant remote / Azure Search / Elasticsearch)
+- Sticky sessions NOT required for `/ask` (each request is self-contained)
+
+LLM and embedding API quota is usually the binding constraint, not CPU.
+
+## Implementation Guidance
+
+### Azure App Service Deployment
+
+Walk through `deploy_azure_webapp.sh` — it provisions:
+- App Service Plan + Web App (Linux, Python 3.11+)
+- Azure AI Search service
+- Azure OpenAI deployment
+- App settings (env vars) wired to the search/openai instances
+
+Customize the resource names, set `WEBSITES_PORT=8000` (or whichever the script uses), deploy via `git push` or `az webapp deploy`. Verify `mode: production` in the deployed `config_webserver.yaml`.
+
+### Snowflake Container Services
+
+NLWeb runs as a containerized service inside Snowflake compute, queries Cortex Search (data is already in Snowflake tables). Use the `setup-snowflake.md` doc — it covers the SPCS service spec, image build, and Cortex Search setup.
+
+### Cloudflare Worker + AutoRAG
+
+Cloudflare maintains a hosted variant. Two options:
+- **Self-host on CF Workers** following `docs/setup-cloudflare-autorag.md` — covers the worker template and AutoRAG wiring.
+- **Use CF's managed deployment** per https://developers.cloudflare.com/ai-search/how-to/nlweb/.
+
+### Docker
+
+If a `Dockerfile` ships in the repo, use it. Otherwise:
+
+```dockerfile
+FROM python:3.11-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . .
+EXPOSE 8000
+CMD ["python", "AskAgent/python/app-aiohttp.py"]
+```
+
+Mount `config/` and `.env` as bind mounts or use env vars + ConfigMaps. Persist `data/db/` (Qdrant local) on a volume if not using a remote vector store.
+
+### Health Checks
+
+- Liveness: `GET /mcp/health` (or `/sites` as a fallback)
+- Readiness: `GET /sites` — fails fast if config is broken
+
+### Logs and Observability
+
+NLWeb logs to stdout via Python `logging`. Wire to your platform's log aggregator (Azure Monitor, CloudWatch, etc.). Key metrics:
+- `/ask` latency (p50, p95, p99) — SSE makes this tricky; measure TTFB and total
+- LLM API errors / 429s
+- Retrieval backend latencies (per-backend)
+- Conversation storage write latency
+
+### Production Failure Modes
+
+- **App boots but `/ask` 500s**: usually an env var missing — check the log for the failing provider.
+- **Streaming requests time out at the proxy**: increase proxy read timeout; turn off proxy buffering.
+- **Cold-start latency**: first request after deploy takes 30-60s as models load. Pre-warm with a synthetic health check.
+- **Bills are huge**: too many LLM calls per query — tune `tool_selection_enabled`, model tiers, and `who_endpoint_enabled`.
+- **Embedding rate limits during data reload**: throttle `--batch-size`, use a separate embedding deployment, or run reloads off-peak.
+
+Always re-fetch the per-target setup doc and `deploy_*.sh` scripts before deploying — these are the most release-sensitive parts of the codebase. (support 0.36)