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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 v2.1.227 10 Aug 2026

MCP skill caching survives more filesystem failures

You'll notice

Useful2 Signal1

MCP

Skills fetched from MCP servers cache correctly despite permission errors or broken cache folders.

What

Caching a skill file fetched from an MCP server now tolerates permission errors (EPERM and EACCES) on rename in addition to the existing already-exists cases, and if an existing cache directory turns out to contain no skill file it is replaced with the freshly fetched copy instead of being left broken. Temporary directories are cleaned up on failure and failed writes now raise a dedicated error.

Details

Where a v5 storage backend is present, the write goes through it instead of the filesystem.

Evidence

MCP skill cache SKILL.md write failed

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

See this entry in the whole of v2.1.227 →