MCPRequestMeta

type MCPRequestMeta = (request) => 
  | Record<string, unknown>
  | undefined
| Promise<Record<string, unknown> | undefined>;

Defined in: packages/ai/src/activities/chat/mcp/types.ts:45

Gives the _meta for one MCP request.

The hook runs once for each MCP request, when the request executes. Its result is sent as the request _meta. Return undefined to send no _meta. @tanstack/ai-mcp drops the keys that MCP reserves (progressToken and the io.modelcontextprotocol/ style prefixes).

If the hook throws or rejects, that one request fails with the error.