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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 v2.1.223

Sandbox now fails loudly when /proc/self/exe cannot be opened

You'll notice
Useful3 Signal0
Sandbox

On Linux, if the sandbox can't set itself up it now stops instead of silently running half-protected.

What

The Linux seccomp helper used to log an error and return undefined, letting startup continue with the sandbox half-configured. It now throws.

Details
  • The error is still reported, then constructed and thrown so the caller cannot proceed.
  • The message text was rewritten to name the embedded apply-seccomp helper.
  • Only on the Linux seccomp sandbox path.
Evidence

sandbox: failed to open /proc/self/exe

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →