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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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8 pages for --fork-session.

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Manage multiple agents with agent view Claude Code CLI · in the page agent-view …it to the background, or a session started with `claude --resume <id> --fork-session`. Before this release, if you ran `/fork` in such a session before sending it a new prompt, Claude Code printed the… Checkpointing Claude Code CLI · in the page checkpointing …[`/branch`](/docs/en/sessions#branch-a-session) or `claude --continue --fork-session` instead. </Note> ## Common use cases Checkpoints are particularly useful when: * **Exploring alternatives**: tr… CLI reference Claude Code CLI · in the page cli-reference …ku` | | `--fork-session` | When resuming, create a new session ID instead of reusing the original (use with… Glossary Claude Code CLI · in the page glossary …ntext-window). Sessions can be resumed with `claude -c`, forked with `--fork-session` to preserve history under a new session ID, or run in parallel across terminals. Running `/clear` starts a new ses… Hooks reference Claude Code CLI · in the page hooks …on resume with `source` set to `"resume"`, or `"fork"` if you added `--fork-session`, so they can refresh their context. #### Decision control Not every event supports blocking or controlling behav… How Claude Code works Claude Code CLI · in the page how-claude-code-works …and appends new messages to the existing conversation. Forking with `--fork-session` or `/branch` copies the history into a new session ID, leaving the original unchanged. <img src="https://mintcdn.… Manage sessions Claude Code CLI · in the page sessions …ermission-mode` or `--dangerously-skip-permissions` * You don't pass `--fork-session` * The run isn't started through [channels](/docs/en/channels) ### Resume from a summary On a Pro or Max plan, wh… Run parallel sessions with worktrees Claude Code CLI · in the page worktrees …worktree add` declines, so launch those from the main checkout. * **`--fork-session`**: the forked session starts in the directory you launched Claude from, and Claude Code leaves the original sessio…