Mathias 174669b9f6 fix(mcp): drop strict session-id requirement on POST /mcp ...

The claude.ai connector's MCP transport proxy does not reliably
propagate the Mcp-Session-Id header issued during initialize. With the
previous strict gate (return 400 plain text "missing or invalid
Mcp-Session-Id"), every tools/list and tools/call from claude.ai
failed and the Anthropic proxy surfaced it as:

  Streamable HTTP error: {"jsonrpc":"2.0","id":N,"error":
    {"code":-32600,"message":"Anthropic Proxy: Invalid content from server"}}

— because the plain-text 400 response is not valid JSON-RPC.

All tools the gitea-mcp server exposes are stateless single-shot
calls, so there is no functional reason to gate them on a session.
brain-mcp and supervisor-mcp don't gate either, and claude.ai works
against them fine. Match that behavior: keep issuing Mcp-Session-Id
on initialize for clients that want to use it, but stop rejecting
calls that don't send one back.

Test renamed PostWithoutSessionRejected → PostWithoutSessionAccepted
and updated to assert the tools/list response shape.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-12 14:58:13 +02:00

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