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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 v2.1.242 ·

Eval run analysis refuses to grade a run that bypassed its mocks

Eval grading now refuses to score a run whose tool calls bypassed the mock servers.

Under the hood In Development
JSON All of v2.1.242
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Plugin EvalArea: what it touches
In DevelopmentKind: in v2.1.242,
In DevelopmentSection of the release
What

The code that reads an eval run's transcript was rewritten. It now verifies each stand-in server connected under the expected name and matched a nonce-marked call log, aborts on an expectation violation, and marks the run ungraded when the transcript shows more tool calls than the stand-ins recorded.

Details
  • Per-tool-call output and error status are now recorded, and permission denials from the result message are honoured.
  • Cost is estimated from assistant token usage when no final result message arrives.
  • Results carry mock call records, a tally, an aborted record and a mock setup failure field.
Evidence

refusing to run against what may be the real server

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

See this entry in the whole of v2.1.242 →

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