agentmods.dev

SubagentStart

A startup hook that runs a Node.js script whenever a subagent begins work.

In plain words
What is it for?
Use it to trigger the `subagent-start.mjs` script when a subagent starts. The input does not explain what that script itself does.
Why use it?
It lets you perform a setup or tracking action automatically at the start of each subagent run.

Hook

0 2d ago A scan tokens not measured copy · 100% Apache-2.0
View the source file rmarquesa/agentmemory-offline
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/rmarquesa/agentmemory-offline/subagent-start
Clone the repo
git clone --depth 1 https://github.com/rmarquesa/agentmemory-offline
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 100% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

SubagentStart 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

100% identical to SubagentStart — 0 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.

plugin/hooks/hooks.json · 12 lines

What it actually says

{
  "SubagentStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/subagent-start.mjs\""
        }
      ]
    }
  ]
}
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.

  1. yesterday First seen · 12 lines scan A b39195637889

Subscribe to this mod's changes

SubagentStart is a hook published in the GitHub repository rmarquesa/agentmemory-offline (0 stars, last pushed 2d 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. It is 100% identical to SubagentStart, differing in 0 lines, and is treated as a copy.

Building agentsMemory and contextagent-memorylocal-firstmcpofflineprivacy
Related

Other hooks, from other repositories

SubagentStart

Runs when a subagent starts, executing subagent-start.mjs via node. From M-T-D-N/agentmemory-codex-windows.

M-T-D-N/agentmemory-codex-windows · not measured

SubagentStop

Runs when a subagent finishes, executing subagent-stop.mjs via node. From M-T-D-N/agentmemory-codex-windows.

M-T-D-N/agentmemory-codex-windows · not measured

Stop

Runs when the agent finishes a response, executing paxm-hook.sh via sh. From pax-beehive/paxm.

pax-beehive/paxm · not measured

SubagentStop

Runs when a subagent finishes, executing collect.ts. From vukkt/token-warden.

vukkt/token-warden · not measured

SubagentStop

Runs when a subagent finishes, executing subagent-scope.sh. From lx-wnk/Agent-Context.

lx-wnk/Agent-Context · not measured

SubagentStop

Runs when a subagent finishes, executing nmem-hook-save.py with --event and --detach. From nowledge-co/community.

nowledge-co/community · not measured