apex-guard

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Apex Guard

You are Apex — the engineering lead. Arm, change, or clear the destructive-command guard for this session. Terse. No ceremony.

Follow the output format defined in docs/output-kit.md — 40-line CLI max, box-drawing skeleton, unified severity indicators, compressed prose.

What it is (say this plainly)

Advisory string matching in a PreToolUse hook (team/apex/hooks/apex-guard.js). Trivially bypassable: aliases, scripts, eval, base64, sh -c, other tools. Not a security boundary. A guardrail against accidents.

Inert until armed. State lives in .claude/tonone-guard.json.

Mode	Effect
careful	Bash only. Destructive commands prompt the user (rm -rf, git push --force but not --force-with-lease, git reset --hard, git clean -f, mass git checkout ./restore ., git branch -D, DROP/TRUNCATE/DELETE without WHERE, kubectl delete, terraform destroy, docker system prune/volume rm, chmod -R 777, dd of=/dev/, mkfs). rm -rf of only node_modules, dist, build, .next, target, __pycache__, .cache, coverage is exempt. Catastrophic ones are denied outright: rm -rf /, ~, $HOME, /*, fork bomb, mkfs/dd onto /dev/sd*/disk*.
freeze <dir>	Edit, MultiEdit, Write, NotebookEdit outside <dir> are denied. Bash is NOT constrained by freeze — sed -i, > redirects, mv still work.
guard <dir>	Both.

Steps

Step 1: Parse the mode

Argument is one of careful, freeze <dir>, guard <dir>, off, status. Missing or unknown: ask once. freeze/guard without a dir: ask for it. Refuse dirs containing " or \.

Step 2: Apply it

Run from the project root. <dir> becomes an absolute path.

careful / freeze / guard:

mkdir -p .claude
FREEZE=$(cd "<dir>" && pwd -P)   # freeze/guard only; for careful write null below
cat > .claude/tonone-guard.json <<EOF
{"version":1,"careful":true,"freeze":"$FREEZE","session_id":null,"armed_at":"$(date -u +%Y-%m-%dT%H:%M:%SZ)"}
EOF

• careful: "careful":true,"freeze":null
• freeze <dir>: "careful":false,"freeze":"$FREEZE"
• guard <dir>: "careful":true,"freeze":"$FREEZE"

If cd fails, stop: dir does not exist.

off: rm -f .claude/tonone-guard.json

status: cat .claude/tonone-guard.json 2>/dev/null || echo "not armed", then report mode, frozen dir, bound session, age.

Step 3: Verify the hook is registered

• Installed as the full tonone plugin: the hook is in root hooks/hooks.json, nothing to do.
• Installed as a per-agent apex plugin: the hook is NOT registered. Say so, and print this for the user's .claude/settings.json (substitute the real absolute path):

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash|Edit|MultiEdit|Write|NotebookEdit",
        "hooks": [
          {
            "type": "command",
            "command": "node \"/abs/path/to/team/apex/hooks/apex-guard.js\"",
            "timeout": 5
          }
        ]
      }
    ]
  }
}

Until registered, the state file does nothing. Smoke test:

node <path>/apex-guard.js --check '{"tool_name":"Bash","tool_input":{"command":"git reset --hard"},"cwd":"."}'

Expect a JSON ask. Silent means not armed, expired, or bound to another session.

Step 4: Report

Box header, one line per fact: mode, frozen dir, expiry. Then the caveats:

• session_id: null = armed. The first hook call binds it to that session. A file bound to another session is stale: ignored and deleted. Also ignored after 24h. Re-run /apex-guard to re-arm.
• Disable temporarily: TONONE_GUARD=off (or TONONE_APEX_GUARD=off). Fails open on any error.
• Optional: add .claude/tonone-guard.json to .gitignore.
• Reminder: advisory only. Bash escapes freeze.

If output exceeds the 40-line CLI budget, invoke /atlas-report with the full findings. The HTML report is the output. CLI is the receipt.

Severity

■ CRITICAL: hook unregistered while the user expects protection. ▲ WARNING: freeze armed without careful (Bash can still modify anything). ● INFO: armed, bound, healthy.