Garry TanandClaude Fable 5
c2d12cd6b5
The new sections pushed careful/SKILL.md to 2551 -> 3879 bytes (x1.52, gate caps growth at x1.5 of the v1.47 baseline). Same content, tighter prose: 3516 bytes (x1.38). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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name, version, description, triggers, allowed-tools, hooks
| name | version | description | triggers | allowed-tools | hooks | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| careful | 0.1.0 | Safety guardrails for destructive commands. (gstack) |
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When to invoke this skill
Warns before rm -rf, DROP TABLE, force-push, git reset --hard, kubectl delete, and similar destructive operations. User can override each warning. Use when touching prod, debugging live systems, or working in a shared environment. Use when asked to "be careful", "safety mode", "prod mode", or "careful mode".
/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 ~/.gstack/analytics
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")'"}' >> ~/.gstack/analytics/skill-usage.jsonl 2>/dev/null || true
What's protected
| Pattern | Example | Risk |
|---|---|---|
rm -rf / rm -r / rm --recursive |
rm -rf /var/data |
Recursive delete |
DROP TABLE / DROP DATABASE |
DROP TABLE users; |
Data loss |
TRUNCATE |
TRUNCATE orders; |
Data loss |
git push --force / -f |
git push -f origin main |
History rewrite |
git reset --hard |
git reset --hard HEAD~3 |
Uncommitted work loss |
git checkout . / git restore . |
git checkout . |
Uncommitted work loss |
kubectl delete |
kubectl delete pod |
Production impact |
docker rm -f / docker system prune |
docker system prune -a |
Container/image loss |
Safe exceptions
These patterns are allowed without warning:
rm -rf node_modules/.next/dist/__pycache__/.cache/build/.turbo/coverage
How it works
The hook reads the command from the tool input JSON, checks it against the
patterns above, and returns a hookSpecificOutput payload with
permissionDecision: "ask" and a warning reason if a match is found (the
decision must be nested under hookSpecificOutput — Claude Code ignores a
top-level permissionDecision). You can always override a MEDIUM warning and
proceed.
HIGH tier (hard deny)
Two catastrophic shapes are denied, not asked: rm -r/-R of exactly
/, ~, or $HOME, and force-push to the repo's default branch. SIMPLE
commands only (no ;, &&, ||, |, newline) — compound shapes fall
through to the MEDIUM ask; --force-with-lease is never HIGH. A best-effort
advisory hard-stop, not a policy boundary: the escape hatch is ending the
opt-in, session-scoped /careful session.
Project patterns (additive only)
Add warn rules — one POSIX ERE per line, # comments OK — in
~/.gstack/careful-patterns.txt (global) or
~/.gstack/projects/<slug>/careful-patterns.txt (per-project). Consulted
after the built-in families, so config can only ADD rules, never suppress a
baseline warning. Invalid regex lines are skipped.
To deactivate, end the conversation or start a new one. Hooks are session-scoped.