components:  mcp-server:    kind: worker    description: >-      The Worker. Serves MCP over Streamable HTTP at /mcp, statelessly: each POST gets a fresh      McpServer with every tool registered. Charges each tool call to the caller's rate limit,      counts tool calls and serves the counts at /stats.    owns:      - src/index.ts      - src/worker.ts      - src/server.ts      - src/usage.ts    talks_to:      - { to: tools, via: import }      - { to: mcp-sdk, via: import }      - { to: usage, via: kv }      - { to: rate-limiter, via: rpc }  rate-limiter:    kind: durable-object    description: >-      One object per client IP holding a token bucket: 30 tool calls in a burst, one more every      two seconds. Runs one call at a time, so the limit is exact. Clears itself once full.    binding: RATE_LIMITER    owns:      - src/rate-limiter/**  tools:    kind: library    description: >-      The tools themselves: a name, a description written for models, zod input and output      schemas and a pure run function each. No MCP, HTTP or bindings in here.    owns:      - src/tools/**    talks_to:      - { to: zod, via: import }  usage:    kind: kv    description: Calls and errors per tool per UTC day, kept 90 days. Approximate by design.    binding: USAGE  mcp-sdk:    kind: external    description: The MCP TypeScript SDK. McpServer validates arguments and builds results; the Web-standard transport speaks Streamable HTTP.    package: "@modelcontextprotocol/sdk"  zod:    kind: external    description: Schema library for tool inputs and outputs. The SDK turns the schemas into JSON Schema for tools/list.    package: zod