An automatic check that runs when the agent finishes a response. It starts a Python program with a gate option to check whether the agent should continue working.

Use it as an end-of-response hook in an agent configuration. It runs the referenced autopilot check after each completed response.

It can catch unfinished work at the point where the agent is about to stop. The provided description does not explain what conditions the check evaluates.

Stop — Hook by synthesisengineering

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add hooks/synthesisengineering/synthesis-skills/stop

Clone the repo

git clone --depth 1 https://github.com/synthesisengineering/synthesis-skills

Or install synthesis-skills, the plugin that ships this one along with the rest of its 55 skills, 2 hooks.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

Stop scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

hooks/hooks.json · 14 lines

What it actually says

{
  "Stop": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${CLAUDE_PLUGIN_ROOT}/skills/synthesis-autopilot/scripts/autopilot_gate.py --gate",
          "timeout": 15,
          "statusMessage": "Checking autopilot engagements for a continuation"
        }
      ]
    }
  ]
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

3d ago First seen · 14 lines scan A 666562086e34

Subscribe to this mod's changes

Stop is a hook published in the GitHub repository synthesisengineering/synthesis-skills (17 stars, last pushed 3d ago), licensed Apache-2.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Stop

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PostToolUse

SessionStart

SessionStart

PreToolUse

PreToolUse

SessionStart