Question mode for Claude Code

Claude is sometimes too proactive. You ask a question, and instead of just answering, it starts editing files.

The fix: add a "question mode" instruction to your CLAUDE.md:

**Question mode:** When a message starts with `?`, `Question`, or `Question:`,
provide analysis/opinion only. Do NOT make any code changes, file edits, or
tool calls that modify anything. Just answer the question and wait for further
instruction.

With this: if I type ? why does this return null sometimes, I can be confident that Claude will explain the issue without making changes.