Method handleMessage

src/mcp/session.ts:121–161

(message: JsonRpcRequest | JsonRpcNotification)

  }

  private async handleMessage(message: JsonRpcRequest | JsonRpcNotification): Promise<void> {
    const isRequest = 'id' in message;
    switch (message.method) {
      case 'initialize':
        if (isRequest) await this.handleInitialize(message as JsonRpcRequest);
        break;
      case 'initialized':
        // Notification that client has finished initialization — no action needed.
        break;
      case 'tools/list':
        if (isRequest) await this.handleToolsList(message as JsonRpcRequest);
        break;
      case 'tools/call':
        if (isRequest) await this.handleToolsCall(message as JsonRpcRequest);
        break;
      case 'ping':
        if (isRequest) this.transport.sendResult((message as JsonRpcRequest).id, {});
        break;
      case 'resources/list':
        // We expose no MCP resources, but some clients (opencode, Codex) probe
        // for them on connect; reply with an empty list instead of a
        // MethodNotFound error that surfaces as a scary `-32601` log line. (#621)
        if (isRequest) this.transport.sendResult((message as JsonRpcRequest).id, { resources: [] });
        break;
      case 'resources/templates/list':
        if (isRequest) this.transport.sendResult((message as JsonRpcRequest).id, { resourceTemplates: [] });
        break;
      case 'prompts/list':
        // Likewise — no prompts exposed, but answer the probe cleanly. (#621)
        if (isRequest) this.transport.sendResult((message as JsonRpcRequest).id, { prompts: [] });
        break;
      default:
        if (isRequest) {
          this.transport.sendError(
            (message as JsonRpcRequest).id,
            ErrorCodes.MethodNotFound,
            `Method not found: ${message.method}`,
          );
        }
    }
  }

  private async handleInitialize(request: JsonRpcRequest): Promise<void> {
    const params = request.params as {