Initial import from garrytan/gstack@026751e (main snapshot via local relay)

Source: https://github.com/garrytan/gstack/commit/026751e

careful/SKILL.md

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+---
+name: careful
+version: 0.1.0
+description: |
+  Safety guardrails for destructive commands. 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". (gstack)
+triggers:
+  - be careful
+  - warn before destructive
+  - safety mode
+allowed-tools:
+  - Bash
+  - Read
+hooks:
+  PreToolUse:
+    - matcher: "Bash"
+      hooks:
+        - type: command
+          command: "bash ${CLAUDE_SKILL_DIR}/bin/check-careful.sh"
+          statusMessage: "Checking for destructive commands..."
+---
+<!-- AUTO-GENERATED from SKILL.md.tmpl — do not edit directly -->
+<!-- Regenerate: bun run gen:skill-docs -->
+
+# /careful — Destructive Command Guardrails
+
+Safety mode is now **active**. Every bash command will be checked for destructive
+patterns before running. If a destructive command is detected, you'll be warned
+and can choose to proceed or cancel.
+
+```bash
+mkdir -p ~/.gstack/analytics
+echo '{"skill":"careful","ts":"'$(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 `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.