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PreToolUse

PreToolUse is a hook for coding agents from mickelsamuel/migrationpilot. Its token cost is not measured, scanned A, original, MIT.

A pre-action hook that runs a Node.js check before the agent writes, edits, or executes terminal commands.

In plain words
What is it for?
It helps apply migration-safety checks automatically to file changes and Bash commands.
Why use it?
It can intercept risky actions before they change files or affect the database.

Hook

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the migrationpilot plugin — 1 skill, 1 hook shipped together

not rated 7 21d ago A scan tokens not measured original MIT
View the source file mickelsamuel/migrationpilot
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add mickelsamuel/migrationpilot
Claude Code
/plugin install migrationpilot

Or install migrationpilot, the plugin that ships this one along with the rest of its 1 skill, 1 hook.

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/mickelsamuel/migrationpilot/pre-tool-use.svg)](https://agentmods.dev/hooks/mickelsamuel/migrationpilot/pre-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/mickelsamuel/migrationpilot/pre-tool-use"><img src="https://agentmods.dev/badge/hooks/mickelsamuel/migrationpilot/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.

integrations/claude-code/hooks/hooks.json · 14 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit|Bash",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/hook.js\"",
          "timeout": 30
        }
      ]
    }
  ]
}
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 · 14 lines scan A 332f8fb47933

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository mickelsamuel/migrationpilot (7 stars, last pushed 21d 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 2026-08-31.

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Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing pre-bash-guard.py with --show-toplevel, --cached, --name-only and --diff-filter (2 commands). From fallow-rs/fallow.

fallow-rs/fallow · not measured

SessionStart

Runs when a session starts, executing scan-hidden-unicode.py via python3 with --mode. From fallow-rs/fallow.

fallow-rs/fallow · not measured

PostToolUse

Runs after a tool call finishes for Edit and Write tool calls, executing post-write-remind.sh. From remyxai/outrider.

remyxai/outrider · not measured

SessionStart

Runs when a session starts, running claudelint check-all --format json. From pdugan20/claudelint.

pdugan20/claudelint · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing ponytail-mode-tracker.js. From ouranos-labs/pseolint.

ouranos-labs/pseolint · not measured

TaskCompleted

Runs when a task is marked completed, executing task-complete-gate.sh. From hanselhansel/context-cli.

hanselhansel/context-cli · not measured