/careful — Destructive Command Guardrails

Safety mode is now active. Every bash command will be checked for destructive patterns before running. If a destructive command is detected, you'll be warned and can choose to proceed or cancel.

mkdir -p .claude/memory
echo '{"skill":"careful","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null || echo "unknown")'"}'  >> .claude/memory/skill-usage.jsonl 2>/dev/null || true

What's protected

See references/destructive-patterns.md for full pattern list.

How it works

The hook reads the command from the tool input JSON, checks it against the patterns above, and returns permissionDecision: "ask" with a warning message if a match is found. You can always override the warning and proceed.

To deactivate, end the conversation or start a new one. Hooks are session-scoped.

Hooks

• PreToolUse on Bash: Warns before destructive commands (rm -rf, DROP TABLE, force-push, reset --hard, kubectl delete)
• Session-scoped — only active when mk:careful is invoked
• User can override each warning individually
• Interaction with mk:investigate: When careful is active during an investigation, destructive-Bash warnings still fire. Debugging commands that touch state require explicit user confirmation per warning — do not bypass.

Gotchas

• False positives on legitimate operations: Pattern matching rm or drop in file content, not commands → Check command context, not just string presence
• Overly broad regex blocking development: Guard triggers on test fixtures or documentation mentioning destructive commands → Scope guards to actual Bash tool invocations only