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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 3 Aug 2026

resources/list and prompts/list stop recording an error when the server lacks the method

You'll notice

Useful3 Signal0

MCP

MCP servers that don't support resource or prompt listing no longer show a bogus error.

What

MCP servers that simply do not implement resource or prompt listing no longer surface a discovery error.

Details

Both discovery functions now skip attaching the stored error when the failure is a MethodNotFound JSON-RPC error, matching the behaviour resource templates already had.

Evidence

Ou.MethodNotFound

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 →