The /fork command has been renamed to /branch for creating a branched copy of the current conversation. The old /fork name is preserved as an alias for backward compatibility.
Usage
/branch
Details
Creates a branch of the current conversation at the current point
All user-facing text updated: "Forked conversation" → "Branched conversation", "No conversation to fork" → "No conversation to branch"
/fork still works as an alias — no migration needed
Error messages updated accordingly: "Failed to branch conversation", "No messages to branch"
Evidence
Slash command definition (search for "Create a branch of the current conversation") — aliases include "fork" for backward compat
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeRenamed /fork to /branch (/fork still works as an alias)
