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PreToolUse

PreToolUse is a hook for coding agents from Chorus-AIDLC/Chorus. Its token cost is not measured, scanned A, original, AGPL-3.0.

A set of actions that run before the agent enters or exits planning mode or starts another agent. A hook is an automatic step triggered by a particular event.

In plain words
What is it for?
Running the three listed scripts before entering a plan, leaving a plan, or creating a task for another agent.
Why use it?
It lets the plugin perform required preparation or checks at these points without waiting for a separate manual command.

Hook

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 chorus plugin — 3 agents, 9 hooks, 1 MCP server shipped together

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

not rated 1.2k today A scan tokens not measured AGPL-3.0
View the source file Chorus-AIDLC/Chorus
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 Chorus-AIDLC/Chorus
Claude Code
/plugin install chorus

Or install chorus, the plugin that ships this one along with the rest of its 3 agents, 9 hooks, 1 MCP server.

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 PreToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/chorus-aidlc/chorus/pre-tool-use.svg)](https://agentmods.dev/hooks/chorus-aidlc/chorus/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/chorus-aidlc/chorus/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/chorus-aidlc/chorus/pre-tool-use.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. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

PreToolUse 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 4d 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.

public/chorus-plugin/hooks/hooks.json · 31 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Same file

What else hooks.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. 4d ago First seen · 31 lines scan A b1d705e61461

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository Chorus-AIDLC/Chorus (1,157 stars, last pushed today), licensed AGPL-3.0. 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Multi-AgentPlanningai-agentsai-dlcclaude-codekanbantask-management
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts, running flux ready --json. From sirsjg/flux.

sirsjg/flux · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From bernatch22/taskops.

bernatch22/taskops · not measured

PreToolUse

Runs before the agent uses a tool for Edit, Write, Grep, Glob, Bash, Edit, Write, NotebookEdit and Bash tool calls, executing spec-hint.js, module-hint.js and docs-hint.js via node (3 commands). From kaanozhan/Frame.

kaanozhan/Frame · not measured

PreCompact

Runs before the context is compacted, running swarm claude pre-compact. From joelhooks/swarm-tools.

joelhooks/swarm-tools · 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, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured