It makes setup work happen automatically at the start of each subagent run. The input does not describe what context the script provides.

SubagentStart — Hook for Claude Code by WdBlink/autoresearch-paper

SubagentStart

SubagentStart is a hook for Claude Code from WdBlink/autoresearch-paper. Its token cost is not measured, scanned A, a copy of SubagentStart, MIT.

A subagent-start hook that runs a shell command whenever a subagent begins. It invokes a Node.js script that supplies subagent context.

In plain words

What is it for?: Use it to initialise or prepare context for subagents through the referenced hook script.
Why use it?: It makes setup work happen automatically at the start of each subagent run. The input does not describe what context the script provides.

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: mentions subagents.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the autoresearch plugin — 5 hooks shipped together

One of 5 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 4 are separate, each on its own page.

Good fit Use it to initialise or prepare context for subagents through the referenced hook script.

Compare 6 hooks from other repositories ↓

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add WdBlink/autoresearch-paper

Claude Code

/plugin install autoresearch

Made for: Claude Code.

Or install autoresearch, the plugin that ships this one along with the rest of its 5 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/wdblink/autoresearch-paper/subagent-start/github.svg)](https://agentmods.dev/hooks/wdblink/autoresearch-paper/subagent-start)

Your own site

<a href="https://agentmods.dev/hooks/wdblink/autoresearch-paper/subagent-start"><img src="https://agentmods.dev/badge/hooks/wdblink/autoresearch-paper/subagent-start/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/hooks/wdblink/autoresearch-paper/subagent-start"><img src="https://agentmods.dev/badge/hooks/wdblink/autoresearch-paper/subagent-start.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. A grade says what 26 rules found in the file — not that it is safe.

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 6d 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.

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.

claude-plugin/hooks/hooks.json · 13 lines

What it actually says

{
  "SubagentStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/node-hook-runner.sh\" \"${CLAUDE_PLUGIN_ROOT}/hooks/subagent-context.cjs\"",
          "timeout": 10
        }
      ]
    }
  ]
}

Same file

What else `hooks.json` configures

This page is one entry in a file that holds 5. Installing the file brings all of them; each is measured and scanned on its own page.

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.

6d ago First seen · 13 lines scan A a267f823159a

Subscribe to this mod's changes

SubagentStart is a hook published in the GitHub repository WdBlink/autoresearch-paper (2 stars, last pushed 7d 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 100% identical to SubagentStart, differing in 0 lines, and is treated as a copy.

Building agents academic-writing agent-skills ai ai-agents autonomous-research

SubagentStart next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
SubagentStartWdBlink/autoresearch-paper	Hook	2	7d ago	MIT	A	—	Claude Code
SessionStartsupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
PostToolUsesupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
SessionStartgoogle-gemini/gemini-cli	Hook	109k	today	Apache-2.0	A	—	Claude Code
PreToolUseapache/superset	Hook	76k	today	Apache-2.0	A	—	Claude Code
PostToolUseanthropics/claude-plugins-official	Hook	47k	today	Apache-2.0	A	—	Claude Code
PreToolUseheygen-com/hyperframes	Hook	84k	today	Apache-2.0	A	—	Claude Code