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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 ·

Worktree creation fails fast in the plugin evaluation harness

Worktree creation fails immediately in the plugin evaluation harness with a clear message.

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
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
What

Creating a session worktree or an agent worktree now checks for the confined-evaluation variable first and throws immediately instead of trying, with the message worktree isolation is unavailable in this session (plugin evaluation harness).

Details
  • Both worktree creation entry points share the same guard.
Evidence

worktree isolation is unavailable in this session (plugin evaluation harness)

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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