feat(server): transport="both" — host MCP and A2A on a single binary (#354)#370
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feat(server): transport="both" — host MCP and A2A on a single binary (#354)#370
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…354) JS sellers host both transports on one Express/Hono app; this is the Python parity. ``serve(transport="both")`` builds both apps from the same handler and routes by URL path on a single Starlette parent: ``/mcp`` and ``/mcp/...`` go to FastMCP's streamable-http app, everything else (``/``, ``/.well-known/agent.json``, A2A push endpoints) goes to the a2a-sdk app. Adopters writing context_factory, middleware, AccountStore, BuyerAgentRegistry, etc., wire one place and reach both transports automatically. * New ``"both"`` value on ``serve(transport=)``. * Internal ``_build_mcp_and_a2a_app`` constructs the dispatcher; ``_serve_mcp_and_a2a`` drives uvicorn against it. * Lifespan composition: FastMCP's session manager and a2a-sdk's stores both initialize via a composed asynccontextmanager on the parent Starlette. Without this, requests to the MCP path fail with ``Task group is not initialized``. * 8 tests via Starlette TestClient. Closes #354. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
JS sellers host both transports on one Express/Hono app; this PR brings Python parity. `serve(transport="both")` routes by URL path on a single Starlette parent — `/mcp` and `/mcp/...` to FastMCP, everything else (`/`, `/.well-known/agent.json`, A2A push) to a2a-sdk. Both apps share one handler instance, so context_factory / middleware / AccountStore / BuyerAgentRegistry wire once and reach both transports.
Closes #354.
Test plan
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