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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.221

ListMcpResources works against cached servers and connects on demand

You'll notice
Useful3 Signal0
MCP

Listing MCP resources now includes cached servers, connecting them on demand instead of skipping them.

What

The resource-listing tool now returns resources from servers that are only in the discovery cache, connecting them as part of the call.

Details
  • the old i.type !== "connected" bail is gone; any connected-or-cached client declaring capabilities?.resources is accepted
  • it then calls ensureConnectedClient with the tool's abort signal and a context label before fetching
  • failures are logged per server, except aborts, which are silent and simply contribute no resources
Evidence

MCP resource listing

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.221 →