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Demonstrate registration of tools conditioned upon client capability support. Also, obviated need for clientConnected callback to pass sessionId because we defer initial fetching of roots happens when you run the get-roots-list tool.

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* In how-it-works.md,
  - added a section on conditional tool registration

* In server/index.ts
  - import registerConditionalTools
  - in an oninitialized handler for the server, call registerConditionalTools
  - removed clientConnected from ServerFactoryResponse and all mentions in docs

* In tools/index.ts
  - export a registerConditionalTools function
  - refactor/move calls to registerGetRootsListTool, registerTriggerElicitationRequestTool, and registerTriggerSamplingRequestTool out of registerTools and into registerConditionalTools

* In server/roots.ts
  - only act if client supports roots
  - remove setInterval from call to requestRoots. It isn't happening during the initialze handshake anymore, so it doesn't interfere with that process if called immediaately

* In get-roots-list.ts, trigger-elicitation-request.ts, and trigger-sampling-request.ts,
  - only register tool if client supports capability

* Throughout the rest of the files, removing all references to `clientConnected`
This commit is contained in:
cliffhall
2025-12-15 17:51:30 -05:00
parent ebac6314cf
commit 1b8f376b90
13 changed files with 324 additions and 324 deletions
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3
src/everything/docs/structure.md
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@@ -168,7 +168,6 @@ src/everything
- `stdio.ts`
- Starts a `StdioServerTransport`, created the server via `createServer()`, and connects it.
- Calls `clientConnected()` to inform the server of the connection.
- Handles `SIGINT` to close cleanly and calls `cleanup()` to remove any live intervals.
- `sse.ts`
- Express server exposing:
@@ -176,10 +175,8 @@ src/everything
- `POST /message` for client messages.
- Manages multiple connected clients via a transport map.
- Starts an `SSEServerTransport`, created the server via `createServer()`, and connects it to a new transport.
- Calls `clientConnected(sessionId)` to inform the server of the connection.
- On server disconnect, calls `cleanup()` to remove any live intervals.
- `streamableHttp.ts`
- Express server exposing a single `/mcp` endpoint for POST (JSON‑RPC), GET (SSE stream), and DELETE (session termination) using `StreamableHTTPServerTransport`.
- Uses an `InMemoryEventStore` for resumable sessions and tracks transports by `sessionId`.
- Connects a fresh server instance on initialization POST and reuses the transport for subsequent requests.
- Calls `clientConnected(sessionId)` to inform the server of the connection.