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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

Usage limits reported distinctly from generic failures

You'll notice

Useful2 Signal2

Artifacts

Background composition now reports hitting a usage limit rather than a generic failure.

What

When a background composition step fails because of a usage limit, it is now reported as declined with the reason usage_limited, rather than being lumped in with every other failure as a generic compose failure.

Evidence

reason: "usage_limited"

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 →