What is SubagentStop?

A hook that runs a Python script when a subagent finishes. A subagent is a separate AI worker handling part of a larger task.

It is for connecting subagent completion to the listed stop script and any checks or cleanup that script performs.

It lets a project perform an automatic action at the moment that worker stops, although the available information does not specify what the script does.

SubagentStop — Hook by webdevtodayjason

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/webdevtodayjason/titanium-plugins/subagent-stop

Clone the repo

git clone --depth 1 https://github.com/webdevtodayjason/titanium-plugins

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 89% copy Near-identical to another mod in the catalogue.

Security

Grade A, and why

SubagentStop 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 yesterday.

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.

Origin

This is a copy

89% identical to SubagentStop — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/titanium-toolkit/hooks/hooks.json · 13 lines

What it actually says

{
  "SubagentStop": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "python3 ${CLAUDE_PLUGIN_ROOT}/hooks/subagent_stop.py"
        }
      ]
    }
  ]
}

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.

yesterday First seen · 13 lines scan A 37de680a6ef1

Subscribe to this mod's changes

SubagentStop is a hook published in the GitHub repository webdevtodayjason/titanium-plugins (7 stars, last pushed 7mo ago), licensed MIT. 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. It is 89% identical to SubagentStop, differing in 3 lines, and is treated as a copy.

Building agents Languages Planning

SubagentStop

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

SubagentStop

SubagentStop

SubagentStop

Stop

SubagentStart

SubagentStop