agentmods.dev

PreToolUse

PreToolUse is a hook for coding agents from lemoncrow-lab/lemoncrow. Its token cost is not measured, scanned A, original, no licence file.

A pre-tool hook that runs a shell script before the agent uses a task tool.

In plain words
What is it for?
Use it to prepare for or inspect task-tool calls, although the available description does not specify what the script itself does.
Why use it?
It provides an automatic step before task-tool calls, such as setup or checking, without requiring a separate prompt.

Hook

Part of the lemoncrow plugin — 9 hooks shipped together

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

not rated 60 yesterday A scan tokens not measured no licence
View the source file lemoncrow-lab/lemoncrow
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/lemoncrow-lab/lemoncrow/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/lemoncrow-lab/lemoncrow

Or install lemoncrow, the plugin that ships this one along with the rest of its 9 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 PreToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/lemoncrow-lab/lemoncrow/pre-tool-use.svg)](https://agentmods.dev/hooks/lemoncrow-lab/lemoncrow/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/lemoncrow-lab/lemoncrow/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/lemoncrow-lab/lemoncrow/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.

integrations/claude/plugin/hooks/hooks.json · 21 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

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 · 21 lines scan A ab7b740f9e92

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository lemoncrow-lab/lemoncrow (60 stars, last pushed yesterday), 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.

Planningagent-memoryai-agentsclaude-codeclicodexcoding-agents
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts, running <PYTHON_EXECUTABLE>. From Foxfire1st/agents-remember.

Foxfire1st/agents-remember · not measured

SessionStart

Runs when a session starts, running an inline shell check. From 777genius/infinity-context.

777genius/infinity-context · not measured

PostToolUse

Runs after a tool call finishes for Read, Write and Edit tool calls, executing repo_brain_hook.py via python (2 commands). From lucianum7/repo-brain.

lucianum7/repo-brain · not measured

AfterAgent

Runs on the AfterAgent event, running an inline shell check. From 777genius/infinity-context.

777genius/infinity-context · not measured

SessionEnd

Runs when a session ends, running an inline shell check. From 777genius/infinity-context.

777genius/infinity-context · not measured

BeforeAgent

Runs on the BeforeAgent event, running an inline shell check. From 777genius/infinity-context.

777genius/infinity-context · not measured