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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.

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Claude Code v2.1.119 23 Apr 2026

Spawn Mode for Worktree Isolation

What

Background sessions and remote control servers can now be configured to use git worktree isolation, giving each session its own isolated copy of the repository.

Details

Configured via --spawn-mode worktree or in daemon.json spawnMode: "worktree"
System prompt injected for worktree sessions: "This is a git worktree — an isolated copy of the repository"
Agents in worktree mode are instructed to call EnterWorktree as their first action
Session records now carry worktreePath, worktreeBranch, and worktreeHookBased fields
After killing a worktree session, the worktree is retained with a hint to use claude rm for cleanup

Evidence

Worktree spawn mode (search for "--spawn-mode", "spawnMode", "worktree retained at")

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

See this entry in the whole of v2.1.119 →