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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 v2.1.238 20 Aug 2026

Permission errors separated from disk-full errors

Under the hood

Useful2 Signal2

Elsewhere

Claude Code can now tell a permission-denied write from a genuinely full disk.

What

Filesystem failures are now sorted into two groups instead of one: the existing out-of-space and handle-exhaustion codes, and a new set of permission codes, so callers can tell "cannot write here" from "disk is full".

Details

The new set covers EACCES, EPERM, and EROFS.

Evidence

new Set(["EACCES", "EPERM", "EROFS"])

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

See this entry in the whole of v2.1.238 →