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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>
83 lines
3.3 KiB
Cheetah
83 lines
3.3 KiB
Cheetah
---
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name: careful
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version: 0.1.0
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description: |
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Safety guardrails for destructive commands. Warns before rm -rf, DROP TABLE,
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force-push, git reset --hard, kubectl delete, and similar destructive operations.
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User can override each warning. Use when touching prod, debugging live systems,
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or working in a shared environment. Use when asked to "be careful", "safety mode",
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"prod mode", or "careful mode". (gstack)
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triggers:
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- be careful
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- warn before destructive
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- safety mode
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allowed-tools:
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- Bash
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- Read
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hooks:
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PreToolUse:
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- matcher: "Bash"
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hooks:
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- type: command
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command: "bash $HOME/.claude/skills/gstack/careful/bin/check-careful.sh"
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statusMessage: "Checking for destructive commands..."
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sensitive: true
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---
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# /careful — Destructive Command Guardrails
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Safety mode is now **active**. Every bash command will be checked for destructive
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patterns before running. If a destructive command is detected, you'll be warned
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and can choose to proceed or cancel.
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```bash
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mkdir -p ~/.gstack/analytics
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echo '{"skill":"careful","ts":"'$(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
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```
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## What's protected
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| Pattern | Example | Risk |
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|---------|---------|------|
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| `rm -rf` / `rm -r` / `rm --recursive` | `rm -rf /var/data` | Recursive delete |
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| `DROP TABLE` / `DROP DATABASE` | `DROP TABLE users;` | Data loss |
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| `TRUNCATE` | `TRUNCATE orders;` | Data loss |
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| `git push --force` / `-f` | `git push -f origin main` | History rewrite |
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| `git reset --hard` | `git reset --hard HEAD~3` | Uncommitted work loss |
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| `git checkout .` / `git restore .` | `git checkout .` | Uncommitted work loss |
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| `kubectl delete` | `kubectl delete pod` | Production impact |
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| `docker rm -f` / `docker system prune` | `docker system prune -a` | Container/image loss |
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## Safe exceptions
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These patterns are allowed without warning:
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- `rm -rf node_modules` / `.next` / `dist` / `__pycache__` / `.cache` / `build` / `.turbo` / `coverage`
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## How it works
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The hook reads the command from the tool input JSON, checks it against the
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patterns above, and returns a `hookSpecificOutput` payload with
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`permissionDecision: "ask"` and a warning reason if a match is found (the
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decision must be nested under `hookSpecificOutput` — Claude Code ignores a
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top-level `permissionDecision`). You can always override a MEDIUM warning and
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proceed.
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## HIGH tier (hard deny)
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Two catastrophic shapes are **denied**, not asked: `rm -r`/`-R` of exactly
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`/`, `~`, or `$HOME`, and force-push to the repo's **default branch**. SIMPLE
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commands only (no `;`, `&&`, `||`, `|`, newline) — compound shapes fall
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through to the MEDIUM ask; `--force-with-lease` is never HIGH. A best-effort
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advisory hard-stop, not a policy boundary: the escape hatch is ending the
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opt-in, session-scoped /careful session.
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## Project patterns (additive only)
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Add warn rules — one POSIX ERE per line, `#` comments OK — in
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`~/.gstack/careful-patterns.txt` (global) or
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`~/.gstack/projects/<slug>/careful-patterns.txt` (per-project). Consulted
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after the built-in families, so config can only ADD rules, never suppress a
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baseline warning. Invalid regex lines are skipped.
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To deactivate, end the conversation or start a new one. Hooks are session-scoped.
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