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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 v2.1.239 Home All releases ←olderv2.1.238 v2.1.240newer→

Claude Code v2.1.239 21 Aug 2026

Artifact tool rejects a URL pointing inside the artifact

You'll notice

Useful2 Signal2

Artifacts

Pointing the artifact tool at a URL inside the artifact now fails with a clear explanation.

What

Passing a url that names a path inside the artifact now fails with a clear error saying to pass the artifact's own URL instead, on both the live-edit and asset paths. Separately, asset-upload consent is now honoured in cases where an extra negated condition previously skipped it.

Details

The new validation returns errorCode 4.
The public-reader failure now carries a distinct errorCode: "public_read_disabled" alongside its existing message text.

Evidence

names a path inside the artifact

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

See this entry in the whole of v2.1.239 →