SubagentStart

A hook that runs when an APE-managed helper starts, loading APE’s hook code.

In plain words
What is it for?
It is for handling the beginning of APE subagent runs.
Why use it?
It lets the system perform its defined setup automatically before the helper works.

Hook

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/aawwcc/ape/subagent-start
Clone the repo
git clone --depth 1 https://github.com/AAWWCC/ape
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 84% 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

84% identical to PreToolUse — 16 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.

hooks/hooks.json · 15 lines

What it actually says

{
  "SubagentStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node --input-type=module -e \"import{join}from'node:path';import{pathToFileURL}from'node:url';const r=process.env.PLUGIN_ROOT,c=process.env.CLAUDE_PLUGIN_ROOT,p=r||c;if(!p)throw new Error('APE hook could not resolve its plugin root');if(r){delete process.env.CLAUDECODE;delete process.env.CLAUDE_CODE;delete process.env.CLAUDE_PLUGIN_ROOT;delete process.env.CLAUDE_PROJECT_DIR}else{process.env.CLAUDECODE='1';delete process.env.CLAUDE_CODE;delete process.env.CODEX_CWD}await import(pathToFileURL(join(p,'dist','ape-hooks.bundle.mjs')))\"",
          "commandWindows": "node --input-type=module -e \"import{join}from'node:path';import{pathToFileURL}from'node:url';const r=process.env.PLUGIN_ROOT,c=process.env.CLAUDE_PLUGIN_ROOT,p=r||c;if(!p)throw new Error('APE hook could not resolve its plugin root');if(r){delete process.env.CLAUDECODE;delete process.env.CLAUDE_CODE;delete process.env.CLAUDE_PLUGIN_ROOT;delete process.env.CLAUDE_PROJECT_DIR}else{process.env.CLAUDECODE='1';delete process.env.CLAUDE_CODE;delete process.env.CODEX_CWD}await import(pathToFileURL(join(p,'dist','ape-hooks.bundle.mjs')))\"",
          "timeout": 30,
          "statusMessage": "Binding APE stage ticket"
        }
      ]
    }
  ]
}
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 · 15 lines scan A 06818318b5b5

Subscribe to this mod's changes

SubagentStart is a hook published in the GitHub repository AAWWCC/ape (0 stars, last pushed 2d 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 84% identical to PreToolUse, differing in 16 lines, and is treated as a copy.