Federated tools/call re-initializes a session only when the backend
signals a missing session: HTTP 400 or 404, or a JSON-RPC error that
names a session. A failing tool is no longer called twice.
tools/list now:
- passes each tool object through and rewrites only its name
- follows nextCursor up to a page cap and keeps the earlier pages if a
later page fails
- skips tools with no name
- resolves name collisions to the server that tools/call routes to
The handshake sends notifications/initialized. tools/call forwards
_meta. Multi-line SSE data is joined. A2A target URLs are joined with
url.JoinPath and keep their query string. agents[].card must start with
"/". Logged target URLs and errors are scrubbed of credentials.
Claude-Session: https://claude.ai/code/session_01V5jYJNxpDFdJkyyExpADrv
The federated /mcp endpoint ignored the Accept header and always
returned application/json. A real MCP client that sends Accept:
application/json, text/event-stream expects SSE framing. It fails with
no data line in SSE response when it receives plain JSON instead.
handleMCPFederated now negotiates the response format once per request
from the Accept header. It threads the result through
writeJSONRPCEnvelope, writeJSONRPCResult, and writeJSONRPCErrorResponse
as an explicit parameter. A request with no Accept header, or one that
omits text/event-stream, still gets byte-identical plain JSON. Only an
explicit text/event-stream token in the Accept list switches the
response to SSE framing. SSE framing is one data line carrying the
JSON-RPC envelope, terminated by the required blank line.
Error responses and every method path honor the negotiated format.
Notification responses stay 202 with no body regardless of Accept.
The SSE branch reuses sse.go newSSEWriter and writeData instead of a
second encoder. writeData already writes the single-frame, correctly
terminated shape this route needs.
Adds a compiled test file with a captured pre-change JSON byte
baseline. It also adds explicit SSE negotiation and framing tests. A
new yaegi-check probe exercises both framings under the real
interpreter.
lukaszraczylo