Feature Request: Support user-configurable keybindings via keybindings.json

[seanhalberthal]

Describe the feature or problem you'd like to solve

All keybindings in Copilot CLI are currently fixed and cannot be customized. This creates friction for users whose terminal/shell already uses some of the default shortcuts, and limits flexibility for different keyboard layouts and personal workflows.

Claude Code (Anthropic's competing CLI) recently shipped a keybinds.json config file that lets users remap keyboard shortcuts. Having a similar feature in Copilot CLI would close this gap and give users more control over their UX.

Proposed solution

Following the existing pattern of user-level config files (e.g. ~/.copilot/lsp-config.json), add support for a ~/.copilot/keybindings.json file that allows remapping built-in actions to custom key combinations.

Example:

{
  "keybindings": [
    { "action": "clearScreen", "key": "ctrl+l" },
    { "action": "cycleMode", "key": "ctrl+m" },
    { "action": "cancelOperation", "key": "ctrl+c" }
  ]
}

A repo-level override at .github/keybindings.json could also be considered, consistent with how instructions files work.

Example prompts or workflows

• A user whose terminal multiplexer captures ctrl+k wants to remap the "delete to end of line" action to a different chord.
• A user on a non-US keyboard layout needs to remap actions that conflict with accented character input.
• A power user wants shortcuts that match their muscle memory from another tool (e.g. VS Code, Emacs, Vim).

Additional context

Reference: Anthropic added keybinds.json support to Claude Code CLI, allowing users to define custom keyboard shortcuts.