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HomeDocsClaude Code CLI 21 Aug 2026
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Run parallel sessions with worktrees changedworktrees

Nearest release: v2.1.239, published 5 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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114114 
115115### Clean up subagent and background-session worktrees
116116 
117A periodic sweep removes worktrees that Claude created for subagents and [background sessions](/docs/en/agent-view#how-file-edits-are-isolated) once they are older than your [`cleanupPeriodDays`](/docs/en/settings#available-settings) setting, following the [retention sweep rules](/docs/en/claude-directory#cleaned-up-automatically). The sweep skips a worktree that still holds work: changed or untracked files, or unpushed commits. It never removes worktrees you create with `--worktree`.
117A periodic sweep removes worktrees that Claude created for subagents and [background sessions](/docs/en/agent-view#how-file-edits-are-isolated) once they are older than your [`cleanupPeriodDays`](/docs/en/settings-reference#cleanupperioddays) setting, following the [retention sweep rules](/docs/en/claude-directory#cleaned-up-automatically). The sweep skips a worktree that still holds work: changed or untracked files, or unpushed commits. It never removes worktrees you create with `--worktree`.
118118 
119119While an agent is running, Claude runs `git worktree lock` on its worktree so that concurrent cleanup cannot remove it. The lock is released when the agent finishes.
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128128 
129129### Choose the base branch
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131New worktrees branch from the repository's default branch, so most sessions don't need this setting. Set `worktree.baseRef` in [settings](/docs/en/settings#worktree-settings) to branch from your current work instead. The setting accepts two values:
131New worktrees branch from the repository's default branch, so most sessions don't need this setting. Set `worktree.baseRef` in [settings](/docs/en/settings-reference#worktree) to branch from your current work instead. The setting accepts two values:
132132 
133133* `"fresh"` (default): branch from the repository's default branch on the remote, usually `main`, so the worktree starts from a clean tree matching the remote.
134134* `"head"`: branch from your current local `HEAD`, so the worktree carries your unpushed commits and feature-branch state. Use this when isolating subagents that need to operate on in-progress work. Inside a worktree, `"head"` resolves to that worktree's `HEAD`, not the main checkout's.
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211211* **The repository's `.git` directory**: git commands in a worktree write to the main repository's shared `.git` directory, and [sandboxing](/docs/en/sandboxing#filesystem-isolation) allows those writes, so commands such as `git commit` work from inside a worktree with the sandbox enabled.
212212* **Plugins**: plugins installed at [project scope](/docs/en/plugins-reference#plugin-installation-scopes) from the main checkout also load in worktrees of the same repository, so you don't need to reinstall them per worktree. Requires Claude Code v2.1.200 or later.
213* **Permission approvals**: choosing "Yes, and don't ask again" for a Bash command in a worktree session saves the rule to the main checkout's `.claude/settings.local.json`, so it applies in the main checkout and in every other worktree of the repository, and it survives the worktree's removal. Before v2.1.211, an approval granted in a worktree was saved inside that worktree, didn't apply elsewhere, and was lost when the worktree was removed. See [where approvals are saved](/docs/en/permissions#permission-system).
213* **Permission approvals**: choosing "Yes, and don't ask again" for a Bash command in a worktree session saves the rule to the main checkout's `.claude/settings.local.json`, so it applies in the main checkout and in every other worktree of the repository, and it survives the worktree's removal. On Windows and the other cases where Claude Code [keeps the local file in the starting directory](/docs/en/settings#where-claude-code-looks-for-each-file), the rule stays with that worktree. Before v2.1.211, an approval granted in a worktree was saved inside that worktree, didn't apply elsewhere, and was lost when the worktree was removed. See [where approvals are saved](/docs/en/permissions#permission-system).
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215215All three apply whether you create the worktree with `--worktree`, with `git worktree add`, or through the [desktop app](/docs/en/desktop#work-in-parallel-with-sessions).
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256256Worktree isolation uses git by default. For SVN, Perforce, Mercurial, or other systems, configure [`WorktreeCreate` and `WorktreeRemove` hooks](/docs/en/hooks#worktreecreate) to provide custom creation and cleanup logic. Because the hook replaces the default git behavior, [`.worktreeinclude`](#copy-gitignored-files-into-worktrees) is not processed when you use `--worktree`. Copy any local configuration files inside your hook script instead.
257257 
258This `WorktreeCreate` hook reads the worktree name from the JSON on stdin with `jq`, checks out a fresh SVN working copy, and prints the directory path so Claude Code can use it as the session's working directory. Add the configuration to your [`settings.json`](/docs/en/settings#settings-files):
258This `WorktreeCreate` hook reads the worktree name from the JSON on stdin with `jq`, checks out a fresh SVN working copy, and prints the directory path so Claude Code can use it as the session's working directory. Add the configuration to your [`settings.json`](/docs/en/settings#where-settings-live):
259259 
260260```json theme={null}
261261{
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