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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.251 ·

Eval failures say whether they can be reproduced

Eval failures now say whether they're reproducible and flag runs killed before reporting.

Under the hood Internal Changes
JSON All of v2.1.251
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Plugin EvalArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
What

When the eval harness's integrity check fails, each failure is now labelled as provokable or unprovokable, and a note is added when the child agent was killed before it could report which calls it refused, so a killed run is no longer indistinguishable from a genuine mismatch.

Evidence

the child was killed before it reported which calls it refused itself

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 →

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