[FEATURE] Feature request: Hook event when Claude prompts for user input (AskUserQuestion)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Summary

Add a hook event that fires when Claude asks the user a question via AskUserQuestion,
so users can trigger notifications (sound, OS alert, etc.) at the moment input is needed.

## Current behaviour
The Stop hook fires when Claude finishes a task, which works well for task-complete
notifications. However, there is no hook event for when Claude is waiting for user input.
AskUserQuestion does not trigger PreToolUse or PostToolUse.

## Desired behaviour
A new hook event — or an extension of PreToolUse — that fires immediately before
Claude displays a question to the user, so it can be matched with "matcher": "AskUserQuestion".

## Use case
Playing a sound notification in VS Code (or any environment) so the user knows Claude
needs their input, not just that it has finished. Currently the only signal is a visual
one in the UI.

## Suggested hook event name
PreToolUse with AskUserQuestion support, or a dedicated UserInputRequired event.

Proposed Solution

When Claude calls AskUserQuestion, a PreToolUse hook should fire with the tool name AskUserQuestion as the matcher — just like it does for Bash, Edit, and other tools.
Ideal experience:

1. Claude needs input and calls AskUserQuestion
2. The PreToolUse hook fires before the question is displayed
3. The user's configured command runs (e.g. plays a sound, sends an OS notification)
4. The question appears in the UI

This would let users configure it in settings.json like:

{
"hooks": {
"PreToolUse": [
{
"matcher": "AskUserQuestion",
"hooks": [
{
"type": "command",
"command": "powershell -c \"(New-Object Media.SoundPlayer 'C:\\Windows\\Media\\chord.wav').PlaySync()\""
}
]
}
]
}
}

No new event type needed — just extending the existing PreToolUse hook to cover
AskUserQuestion the same way it covers other tools.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_