Bookshop MCP Example
Exposes a CAP bookshop service via MCP, enabling AI agents to query books, authors, and genres using natural language.
README
Bookshop MCP Example
A minimal CAP bookshop sample that exposes its service via the Model Context Protocol (MCP), letting AI agents and LLM tools query it directly.
Official CAP MCP docs: https://cap.cloud.sap/docs/guides/protocols/mcp
Setup
npm install
Run
cds watch
The MCP server starts automatically and is registered with local MCP clients (Claude Code, Opencode).
How it works
The CatalogService in srv/cat-service.cds is annotated with @mcp, which is all that's needed to expose it as an MCP server:
annotate CatalogService with @mcp;
The adapter creates three tools per service:
| Tool | Purpose |
|---|---|
describe |
Returns the data model (entities, actions, functions) |
query |
Reads data — supports select, where, orderBy, limit, etc. |
call_action |
Invokes unbound actions/functions (e.g. submitOrder, checkAvailability) |
Try it
With Claude Code or Opencode running, just ask:
list books with authors and genres
Inspect tools
npm run inspector
Opens the MCP Inspector at http://localhost:5173. Connect to http://localhost:4004/mcp/browse to browse tools interactively.
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