Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.259,
What probably matters to youSection of the release
For claude.ai-proxy MCP connections, the client can now cache and adopt a "discover projection" from /v1/mcp_servers, skipping the server/discover round trip on connect. If the upstream later rejects a request built from that cached projection, the client discards it for that connector, re-probes server/discover on a fresh transport, and logs a tengu_mcp_listing_prior_rejected event.
