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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

MCP resource prefetch no longer hangs when fewer clients report back

You'll notice

Useful3 Signal0

MCP

Fixes startup hanging forever when MCP resource prefetch got fewer replies than expected.

What

prefetchAllMcpResources resolves even if the per-client count comes up short.

Details

Previously it only resolved once the per-client counter reached the expected total.
It now also resolves when the underlying enumeration promise settles, so a short count cannot leave the prefetch pending forever.

Evidence

prefetchAllMcpResources

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 →