[BUG] AskUserQuestion auto-selects without waiting for user input in custom commands/skills

Preflight Checklist

• [x] I have searched existing issues and found #10267 (closed due to inactivity, locked)
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

When AskUserQuestion is called from within a custom command (skill), the question is not displayed to the user and the tool returns immediately with an empty or auto-filled answer. The AI then proceeds as if the user answered, skipping user interaction entirely.

This was previously reported in #10267 (v2.0.26) and #20006 (v2.0.27), both closed due to inactivity. The bug still persists in v2.1.63.

Observed behavior

In a single session:

| # | Context | Result |
|---|---------|--------|
| 1-3 | AskUserQuestion called right after /skill-name invocation | Not displayed, returned empty answer, auto-proceeded |
| 4-6 | AskUserQuestion called after user interrupted the flow | Displayed correctly, user could interact normally |

What Should Happen?

AskUserQuestion should always display to the user and wait for input, regardless of whether it's called from a custom command/skill or directly.

Steps to Reproduce

1. Create a custom command (skill) that calls AskUserQuestion as its first interaction
2. Invoke the skill via /skill-name with arguments
3. AskUserQuestion is skipped — no UI shown, empty answer returned

Claude Model

Opus

Is this a regression?

No, this never worked (reported since v2.0.26)

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

macOS (Darwin 24.5.0)

Terminal/Shell

bash (Terminal.app)

Additional Information

Related closed issues:

• #10267 — Original report (v2.0.26, closed due to inactivity)
• #20006 — Duplicate of #10267 (v2.0.27, auto-closed)