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Implement Medusa v2 fulfillment — fulfillment module, provider interface, shipping options, fulfillment sets, shipping profiles, and multi-warehouse support. Use when adding fulfillment providers.

Extend the Medusa v2 admin dashboard — widgets injected at zones, custom UI routes, Medusa UI components, and Admin API integration. Use when customizing the admin interface.

Create custom Medusa v2 API routes — file-based routing, HTTP method exports, middleware configuration, Zod validators, authentication middleware, and additional-data pattern. Use when adding REST endpoints.

Implement Medusa v2 cart and checkout — cart lifecycle, line items, shipping and payment selection, sales channels, and checkout completion flow. Use when building cart and checkout features.

Set up a Medusa v2 development environment — CLI, PostgreSQL/Redis prerequisites, project creation, medusa-config.ts, directory structure, environment variables. Use when starting a new Medusa project.

Integrate NLWeb with ChatGPT's Apps SDK — the Node.js MCP server in `openai-apps-sdk-integration/`, the `nlweb-list` tool, the React widget at `ui://widget/nlweb-list.html`, and the port-8100 AppSDK adapter that translates NLWeb's message list to OpenAI Apps SDK envelopes. Use when publishing an NLWeb site as a ChatGPT app or wiring NLWeb results into an Apps SDK widget.

Ingest site content into NLWeb's vector store using `db_load.py` — supports RSS/Atom feeds, Schema.org JSON-LD, sitemap-driven URL lists, and CSV. Covers chunking, embedding computation, site partitioning, batch sizing, delete-and-reload, and per-backend write_endpoint targeting. Use when bootstrapping a site's index, refreshing content, or migrating between retrieval backends.

Expose NLWeb as an MCP (Model Context Protocol) server — JSON-RPC 2.0 endpoint at /mcp, the `ask` / `list_sites` / `who` tools, MCP protocol version 2024-11-05, and integration with ChatGPT, Claude, Gemini, and other agent clients. Use when wiring NLWeb to an AI agent via MCP or building an MCP client that consumes an NLWeb site.

Build custom Medusa v2 modules — DML data models, services extending MedusaService, loaders, module links, and container registration. Use when creating custom modules.

Develop and publish Medusa v2 plugins — plugin structure, plugin vs module comparison, npm packaging, and reusable plugin template. Use when building distributable Medusa extensions.

Build Medusa v2 storefronts with Next.js 15 — App Router, JS SDK client setup, Tanstack Query, server components, product pages, cart, and checkout flow. Use when developing headless storefronts.

NLWeb development patterns — the mixed-mode programming philosophy, FastTrack vs Analysis parallel paths, config file precedence and the `mode: development` override trap, in-stream NLWS headers vs HTTP headers, embedding/ingest determinism, debugging the LLM-call chain, neural scorer selection (NLWebScorer ModernBERT+GAM), and the A2A / AgentFinder / DataFinder / ModelRouter subsystems. Use when