Tools
Claude Code MCP servers configured as `http` never connected if the server only spoke legacy HTTP+SSE
2.1.265 fixes MCP servers declared with transport `http` that only implement the older HTTP+SSE transport never connecting at all; Claude Code now falls back to SSE as the MCP spec describes. A companion fix stops claude.ai connectors in cloud sessions showing as needing authentication when a server answers an unsupported request with HTTP 401. Both are the same class of problem: a server that is technically spec-compliant on an older revision was being treated as broken, and the failure surfaced to users as an auth prompt rather than a transport mismatch.
Source
↳ Follow the thread