PreToolUse

PreToolUse is a hook for Claude Code from tuan3w/obsidian-vault-agent. Its token cost is not measured, scanned A, original, MIT.

A pre-tool hook that runs shell checks before an agent writes, edits, or executes commands in an Obsidian vault project.

In plain words
What is it for?
Use it to enforce protection scripts before file-editing and shell tools run.
Why use it?
It helps prevent changes to protected templates and Obsidian configuration files.

Hook for Claude Code

Written for Claude Code: $CLAUDE_PROJECT_DIR variable.

Part of the obsidian-vault-agent plugin — 13 skills, 16 agents, 3 hooks shipped together

One of 3 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 2 are separate, each on its own page.

Good fit Use it to enforce protection scripts before file-editing and shell tools run.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/tuan3w/obsidian-vault-agent/pre-tool-use
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.

Clone the repo
git clone --depth 1 https://github.com/tuan3w/obsidian-vault-agent

Made for: Claude Code.

Or install obsidian-vault-agent, the plugin that ships this one along with the rest of its 13 skills, 16 agents, 3 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/tuan3w/obsidian-vault-agent/pre-tool-use.svg)](https://agentmods.dev/hooks/tuan3w/obsidian-vault-agent/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/tuan3w/obsidian-vault-agent/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/tuan3w/obsidian-vault-agent/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 original 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 8d 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.

hooks/hooks.json · 24 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "\"$CLAUDE_PROJECT_DIR\"/hooks/protect-templates.sh",
          "statusMessage": "Checking templates protection..."
        }
      ]
    },
    {
      "matcher": "Write|Edit|Bash",
      "hooks": [
        {
          "type": "command",
          "command": "\"$CLAUDE_PROJECT_DIR\"/hooks/protect-obsidian.sh",
          "statusMessage": "Checking .obsidian protection..."
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 3. 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. 8d ago First seen · 24 lines scan A eb68e6414e29

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository tuan3w/obsidian-vault-agent (37 stars, last pushed 5mo ago), licensed MIT. 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.