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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 v2.1.216

Session Fork: More Specific Error Messages

What

When a session cannot be forked, the error now gives a specific reason rather than a generic refusal.

Details
  • Persistence off: "Can't fork: session persistence is off, so the new session would have nothing to start from."
  • Restricted flags: "Can't fork: this session was started with launch flags (safe or bare mode, a custom system prompt, a tool allowlist, or restricted settings)..."
  • Nothing to fork yet: "Nothing to fork yet. Send a message first."
  • Messages have also been shortened and made direct (no more parenthetical asides about worktrees or agent view)
Evidence

Fork error messages (search for "Can't fork: session persistence is off" or "Can't fork: this session was started with launch flags").

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.216 →