agentmods.dev

SubagentStart

A hook that runs when a subagent starts. A subagent is a separate agent process working on part of a larger task.

In plain words
What is it for?
Use it to record or prepare for a subagent's work.
Why use it?
It lets you handle delegated work at the moment it begins.

Hook for Claude Code

37 2mo ago A scan tokens not measured no licence
View the source file connerohnesorge/conclaude
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/connerohnesorge/conclaude/subagent-start
Clone the repo
git clone --depth 1 https://github.com/connerohnesorge/conclaude

Made for: Claude Code.

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 unknown No closer match found 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 2d 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.

.claude/settings.json · 14 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2d ago First seen · 14 lines scan A dfab7d7f4be9

Subscribe to this mod's changes

SubagentStart is a hook published in the GitHub repository connerohnesorge/conclaude (37 stars, last pushed 2mo ago), with no licence file. 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.

Building agentsLanguagesPlanningbunclaudeclaude-codeclaude-code-hooksnixnix-flake
Related

Other hooks, from other repositories

SubagentStop

Runs when a subagent finishes for rulecheck-agent tool calls, executing slack-notify.sh. From coleam00/Archon.

coleam00/Archon · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing guard.sh via bash. From OnyxynO/plugin-claude-npm-bun-guard.

OnyxynO/plugin-claude-npm-bun-guard · not measured

SubagentStart

Runs when a subagent starts, running clens-hook SubagentStart. From silouone/clens.

silouone/clens · not measured

SubagentStop

Runs when a subagent finishes, running bash "$CLAUDE_PROJECT_DIR"/.claude/hooks/subagent-stop. From Edmonds-Commerce-Limited/claude-code-hooks-daemon.

Edmonds-Commerce-Limited/claude-code-hooks-daemon · not measured

SubagentStart

Runs when a subagent starts, running bash "$CLAUDE_PROJECT_DIR"/.claude/hooks/subagent-start. From Edmonds-Commerce-Limited/claude-code-hooks-daemon.

Edmonds-Commerce-Limited/claude-code-hooks-daemon · not measured

SubagentStart

Runs when a subagent starts, executing bin.mjs via bun. From fusengine/codex.

fusengine/codex · not measured