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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 v2.1.246 25 Aug 2026

Artifact request failures say when the sandbox proxy blocked them

You'll notice

Useful2 Signal2

Artifacts

A blocked network request no longer looks like an artifact permissions problem.

What

A 403 from the sandbox proxy is now recognised and logged separately from a denial by the artifact service itself, so a blocked network egress no longer looks like a permissions problem with the artifact.

Details

Failed responses now yield both a human-readable reason and a machine error code taken from the body's error field, restricted to lowercase letters, digits and underscores, up to 64 characters.

Evidence

sandbox proxy denied

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

See this entry in the whole of v2.1.246 →