What
A new recording/replay pipeline captures edits made to the text in the prompt input box (the composer). If a prompt.edit hook is registered, these edits are now routed through that hook chain before being applied to the input box. If no such hook is registered, the edits are applied directly and Claude Code logs that they went through unhooked.
Why
This lets a hook intercept and potentially modify what you type into the prompt box before it takes effect, opening the door to custom processing of composer edits.
Names in the bundleprompt.edit
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up prompt.edit, on Mods reference.
| A hook's own execution time for one event, not counting time inside `next` or a mods API call other than `$.clock.sleep` | 10 seconds, or 50 milliseconds for a `prompt.edit` hook |plugins/mods/reference see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up prompt.edit, on Mods reference.