Method handleToolsCall

src/mcp/session.ts:261–295

(request: JsonRpcRequest)

  }

  private async handleToolsCall(request: JsonRpcRequest): Promise<void> {
    const params = request.params as {
      name: string;
      arguments?: Record<string, unknown>;
    };

    if (!params || !params.name) {
      this.transport.sendError(request.id, ErrorCodes.InvalidParams, 'Missing tool name');
      return;
    }

    const toolName = params.name;
    const toolArgs = params.arguments || {};

    const tool = tools.find((t) => t.name === toolName);
    if (!tool) {
      this.transport.sendError(
        request.id,
        ErrorCodes.InvalidParams,
        `Unknown tool: ${toolName}`,
      );
      return;
    }

    if (process.env.CODEGRAPH_MCP_DEBUG) process.stderr.write(`[mcp-debug] toolsCall ${toolName} id=${String(request.id)} pre-init\n`);
    await this.retryInitIfNeeded();

    if (process.env.CODEGRAPH_MCP_DEBUG) process.stderr.write(`[mcp-debug] toolsCall ${toolName} id=${String(request.id)} dispatch\n`);
    const result = await this.engine.getToolHandler().execute(toolName, toolArgs);
    if (process.env.CODEGRAPH_MCP_DEBUG) process.stderr.write(`[mcp-debug] toolsCall ${toolName} id=${String(request.id)} done\n`);
    this.transport.sendResult(request.id, result);
    // After the reply is on the wire — telemetry must never delay a tool
    // response (in-memory increment only; see src/telemetry).
    getTelemetry().recordUsage('mcp_tool', toolName, !result.isError, this.clientInfo);
  }

  /**
   * Lazy default-project resolution. Three layers: