PreToolUse

PreToolUse is a hook for Claude Code from 2anki/2anki.net. Its token cost is not measured, scanned A, original, no licence file.

Automatic checks that run before the agent uses selected tools, such as Bash, Write, Edit, NotebookEdit, and Read.

In plain words
What is it for?
Pre-action safety checks and project workflow checks, including commit, merge, push, browser, changelog, formatting, and type-checking checks.
Why use it?
They can catch unsafe commands, invalid commit or merge states, missing changelog updates, and formatting or type-checking problems before the action happens.

Hook for Claude Code

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

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/2anki/2anki.net/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/2anki/2anki.net

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/2anki/2anki.net/pre-tool-use.svg)](https://agentmods.dev/hooks/2anki/2anki.net/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/2anki/2anki.net/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/2anki/2anki.net/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 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

PreToolUse scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

"command": "python3 $CLAUDE_PROJECT_DIR/.claude/hooks/pre-bash-curl-pipe.py"
.claude/settings.json · 64 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 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. 4d ago First seen · 64 lines scan A cc8498eca161

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository 2anki/2anki.net (324 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 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.