Under the hood
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MCP connections can cache a discovery projection to skip a round trip, discarding and re-probing it if the server rejects it.
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.
Names in the bundletengu_mcp_listing_prior_rejected