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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 v2.1.212

/fork Command

New /fork command copies the current conversation into a new background session, letting you branch off to explore an idea or delegate work without interrupting the main thread.

Usage
/fork                        # fork with no initial prompt
/fork <prompt>               # fork and immediately send the prompt to the copy
Details
  • The fork starts with your full conversation history up to this point.
  • The forked session runs as a background agent — check on it with claude attach or the agent view.
  • Cannot fork if session persistence is off, or if the session was started with certain launch flags (safe mode, custom system prompt, tool allowlist) that the copy wouldn't inherit.
  • The fork tip: "(← moves this session into the agent view too) · tip: /fork \<prompt\> starts the copy working right away"
Evidence

"Copy this conversation into a new background session and keep working here" (search for "fork" in command definitions)

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

See this entry in the whole of v2.1.212 →