You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
What
Tool, resource, prompt and resource-template listings are now cached per server rather than re-fetched, and failures are classified instead of being opaque.
Details
Caching is keyed on server name plus config, with the cache entry deleted on failure so the next attempt retries.
Failures set needs-auth and bearer-rejected flags on the client and map JSON-RPC codes to reasons such as mcp_list_tools_timeout.
Evidence
tools/list 401/403 on claude.ai proxy \u2014 flagging needs-auth
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed /mcp listing a project .mcp.json entry that declares the claude.ai connector type under the trusted "claude.ai" heading; it now…
