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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 v2.1.232

MCP discovery cache and skills fetcher built on first use

Under the hood
Useful1 Signal1
MCP

The MCP discovery cache and skills fetcher are built on first use rather than at load.

What

Both are now created lazily per host rather than at module load, which changes when they come into existence but not what they do.

Details
  • Setting MCP_DISCOVERY_CACHE=false still disables the cache, reporting env-disabled; an injectable kill switch reports kill-switch.
  • The kill switch and account resolver are now attached to the per-host store rather than a module-level one.
Evidence

discoveryCacheStore

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

See this entry in the whole of v2.1.232 →