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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 28 Aug 2026

Artifact creation from agents reports distinct credential failures

You'll notice

Useful2 Signal2

Artifacts

Artifact creation from an agent run now names whether credentials were missing or rejected.

What

Creating an Artifact from a non-interactive agent run now fails with its own codes, agent_no_credential when no credential is available and agent_credential_refused when one is rejected, rather than the generic no-auth and forbidden messages used for interactive creation.

Details

Selected by the interactive flag on the artifact-create call being false.
Interactive creation keeps its existing messages.

Evidence

agent_no_credential

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

See this entry in the whole of v2.1.251 →