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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Sandbox shell errors are merged into one readable message

You'll notice
Useful3 Signal2
Sandbox

Repeated sandbox shell errors collapse into one readable message.

sandbox.failIfUnavailable
What

When a shell grant is active and several errors all carry the same sandbox.failIfUnavailable=false advice, that boilerplate is stripped and the errors are merged into a single message instead of being listed raw.

Details
  • Applies only when a shell grant is in effect.
Evidence

Set sandbox.failIfUnavailable=false

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 v2.1.251 →