Subscribe MCP server logging events in an Agent

[daizeyao]

Please read this first

• Have you read the docs? Agents SDK docs YES
• Have you searched for related issues? Others may have had similar requests YES

Describe the feature

Description
My MCP tool calls often take a long time (around 2–4 minutes). This is why I raised #772 about wanting configurable timeouts.

What I’d like is to stream real-time logs while the agent is analyzing, so that I can see progress updates instead of waiting silently. For example, in mcpserver I can use sendLoggingMessage to print logs (modelcontextprotocol/typescript-sdk#311).

Currently, my solution is to manually implement a CustomMCPServerSSE class and set up an extra channel during agent.run to receive logs. This works, but it feels hacky.

Question:
Is there a more elegant way to implement interactive log streaming for MCP Tools, so that during an agent run I can receive real-time responses/logs without building a separate custom SSE pipeline?

[seratch]

Thanks for sharing this. There is no way to subscribe to the logging events from MCP servers, but this may be a useful feature for many apps. I'll explore what the best design for it. Perhaps, something like this may work:

  const mcpServer = new MCPServerStdio({
    name: 'Logging Demo Server',
    fullCommand: 'pnpm tsx examples/mcp/logging-server.ts',
    serverLogging: {
      level: 'info',
      handler: async ({level, logger, data, meta}) => {
        // do something here
      },
    },
  });