What
The hotkey property on the plugin-facing Button component now accepts a single lowercase letter from a to z, in addition to the digits 0 through 9 it already accepted.
Why
This gives plugin authors more available hotkey options for buttons, since digits alone limited them to ten possible shortcuts.
Names in the bundlehotkey
Documented inclaude-code/desktop-linux
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 hotkey, on Mods reference.
More `Button` rules: `action` names one of Claude Code's own [keybinding actions](/docs/en/keybindings), and the user's binding for it presses the button when that binding is a chord or a modified key. A digit `hotkey` on a button in the b…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 hotkey, on Mods reference.