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atelier-pipeline: Hook for Claude Code

.claude/settings.json

SubagentStart is a hook for Claude Code from robertsfeir/atelier-pipeline. Its token cost is not measured, scanned A, a copy of SessionStart, Apache-2.0.

An automatic event hook that runs a logging script whenever a subagent starts.

In plain words
What is it for?
Use it to track when delegated agents begin work, which can help with workflow auditing and troubleshooting.
Why use it?
It creates a record of subagent activity without requiring the main agent or developer to remember to log each start.

Hook for Claude Code

Written for Claude Code: $CLAUDE_PROJECT_DIR variable.

This is robertsfeir/atelier-pipeline's own configuration. It tells Claude Code how to work on atelier-pipeline itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything atelier-pipeline configures →

Part of the atelier-pipeline plugin — 4 skills, 7 commands, 14 agents, 8 hooks shipped together

One of 9 entries in settings.json — they are configured in one file and arrive together.

not rated 25repo 2mo ago A scan tokens not measured copy · 45% Apache-2.0
View source ↗ robertsfeir/atelier-pipeline
Reuse

Borrowing it

Nothing to install: this file belongs to robertsfeir/atelier-pipeline. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/robertsfeir/atelier-pipeline/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/robertsfeir/atelier-pipeline

Made for: Claude Code.

Or install atelier-pipeline, the plugin that ships this one along with the rest of its 4 skills, 7 commands, 14 agents, 8 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.

agentmods badge for SubagentStart

README.md
[![agentmods](https://agentmods.dev/badge/hooks/robertsfeir/atelier-pipeline/subagent-start.svg)](https://agentmods.dev/hooks/robertsfeir/atelier-pipeline/subagent-start)
Your own site
<a href="https://agentmods.dev/hooks/robertsfeir/atelier-pipeline/subagent-start"><img src="https://agentmods.dev/badge/hooks/robertsfeir/atelier-pipeline/subagent-start.svg" alt="Measured on agentmods" 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 45% 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 7d 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

45% identical to SessionStart — 7 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/settings.json · 12 lines

What it actually says

{
  "SubagentStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/log-agent-start.sh"
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 9. 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.

  1. 7d ago First seen · 12 lines scan A 92fc24b51fe8

Subscribe to this mod's changes

SubagentStart is a hook published in the GitHub repository robertsfeir/atelier-pipeline (25 stars, last pushed 2mo 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 45% identical to SessionStart, differing in 7 lines, and is treated as a copy.

Claude CodeMulti-Agentai-agentsclaude-code-plugininstitutional-memorymcp
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash, Write, Edit, MultiEdit and Agent tool calls, executing pre-tool-guard.sh, local-mode-tracking-guard.sh, task-state-guard.sh, lean-comments-guard.sh, parallel-rework-guard.sh, parallel-dispatch-guard.sh and in-flight-marker.sh (7 commands). From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

SessionEnd

Runs when a session ends, executing session-staging.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

TaskCompleted

Runs when a task is marked completed, executing task-completed.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing prompt-guard.sh. From OrodruinLabs/nazgul.

OrodruinLabs/nazgul · not measured

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

supabase/supabase · not measured