Claude ran git clean -fd without permission, destroyed untracked files

What happened

During a conversation where the user asked to revert a commit, Claude ran git clean -fd without asking for permission, permanently deleting all untracked files from the working directory.

Steps that led to the issue

1. User asked to revert a boxShadow migration commit
2. Claude ran git stash (which does not capture untracked files)
3. Claude ran git clean -fd to "clean up" the working directory
4. This permanently deleted all untracked files, including files the user was actively working on in parallel

Why this is a problem

• git clean -fd is a destructive, irreversible operation
• Claude's own system instructions explicitly say to confirm before running destructive operations
• The untracked files were visible in git status and clearly part of the user's active work
• There is no way to recover files deleted by git clean
• The user lost work that cannot be identified or fully recreated

Expected behavior

Claude should NEVER run git clean -fd without explicit user confirmation. It should be treated the same as git reset --hard or rm -rf — a dangerous command that requires approval.

Environment

• Claude Code CLI
• macOS
• Model: claude-opus-4-6