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PreToolUse

PreToolUse is a hook for coding agents from zircote/lsp-tools. Its token cost is not measured, scanned A, original, MIT.

A check that runs before the agent executes a Bash command. It runs language-specific checks and can block a Git commit when those checks fail.

In plain words
What is it for?
Use it as a pre-commit quality gate for projects supported by the lsp-tools checks.
Why use it?
It catches code-quality problems before a commit is created, reducing the chance of saving changes that fail required checks.

Hook

Part of the lsp-tools plugin — 1 skill, 1 command, 2 hooks shipped together

One of 2 entries in hooks.json — they are configured in one file and arrive together.

not rated 12 24d ago A scan tokens not measured original MIT
View the source file zircote/lsp-tools
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/zircote/lsp-tools/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/zircote/lsp-tools

Or install lsp-tools, the plugin that ships this one along with the rest of its 1 skill, 1 command, 2 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/zircote/lsp-tools/pre-tool-use.svg)](https://agentmods.dev/hooks/zircote/lsp-tools/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/zircote/lsp-tools/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/zircote/lsp-tools/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 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 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.

hooks/hooks.json · 17 lines

What it actually says

{
  "PreToolUse": [
    {
      "name": "lsp-hooks-pre-commit",
      "description": "Quality gate: block git commits if language-specific checks fail",
      "matcher": "Bash",
      "hooks": [
        {
          "type": "command",
          "command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/lsp-hooks.sh\" pre",
          "timeout": 60,
          "blocking": true
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 2. 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 · 17 lines scan A 027de0685fed

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository zircote/lsp-tools (12 stars, last pushed 24d 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.

claude-codeclaude-code-plugincode-intelligencedeveloper-tools
Related

Other hooks, from other repositories

PostToolUse

Runs after a tool call finishes for Grep, Glob, Read, Edit, Write and mcp__.*[Rr]epowise.*__.* tool calls, running an inline shell check. From repowise-dev/repowise.

repowise-dev/repowise · not measured

SessionStart

Runs when a session starts on startup, resume and clear, running an inline shell check. From repowise-dev/repowise.

repowise-dev/repowise · not measured

PreToolUse

Runs before the agent uses a tool for Write tool calls, executing check-file-naming.sh and check-test-location.sh via bash (2 commands). From alperhankendi/Ctxo.

alperhankendi/Ctxo · not measured

Stop

Runs when the agent finishes a response, running /Users/roman/.dotnet/tools/multiagent-setup hook stop-guard. From Neftedollar/FsLangMCP.

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PreToolUse

Runs before the agent uses a tool for Write and Edit tool calls, executing file_naming_validator.ts and backlog_validator.ts (2 commands). From CRJFisher/ariadne.

CRJFisher/ariadne · not measured

PreToolUse

Runs before the agent uses a tool for Read, Grep, Glob and Bash tool calls, executing scala-semantic-guard.sh. From MercurieVV/ScalaSemantic.

MercurieVV/ScalaSemantic · not measured