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.
Worktree creation fails fast in the plugin evaluation harness
Under the hood
Useful1Signal2
Elsewhere
Worktree creation fails immediately in the plugin evaluation harness with a clear message.
What's wrong with this entry?
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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.