agentmods.dev

brainlehr: Hook for Claude Code

.claude/settings.json

PreToolUse is a hook for Claude Code from 3lehr/brainlehr. Its token cost is not measured, scanned A, original, AGPL-3.0.

A pre-tool hook that runs two Python scripts before Bash or another agent is used.

In plain words
What is it for?
Used to run a stash guard and retrieve an agent anchor before Bash or agent calls.
Why use it?
It allows checks to run before potentially significant tool actions begin.

Hook for Claude Code

Written for Claude Code: installed under .claude/.

This is 3lehr/brainlehr's own configuration. It tells Claude Code how to work on brainlehr 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 brainlehr configures →

One of 6 entries in settings.json — they are configured in one file and arrive together.

not rated 0repo 4d ago A scan tokens not measured AGPL-3.0
View source ↗ 3lehr/brainlehr
Reuse

Borrowing it

Nothing to install: this file belongs to 3lehr/brainlehr. 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/3lehr/brainlehr/main/.claude/settings.json
Clone the repo
git clone --depth 1 https://github.com/3lehr/brainlehr

Made for: Claude Code.

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/3lehr/brainlehr/pre-tool-use.svg)](https://agentmods.dev/hooks/3lehr/brainlehr/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/3lehr/brainlehr/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/3lehr/brainlehr/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. A grade says what 26 rules found in the file — not that it is safe.
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 3d 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 · 22 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 settings.json configures

This page is one entry in a file that holds 6. 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. 3d ago First seen · 22 lines scan A 8390962f5888

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository 3lehr/brainlehr (0 stars, last pushed 4d ago), 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 2026-09-04.

Building agents
Related

Other hooks, from other repositories

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

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

PreToolUse

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

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured

PreCompact

Runs before the context is compacted for manual and auto tool calls, executing hook-handler.cjs via node (4 commands). From ruvnet/RuView.

ruvnet/RuView · not measured