PostToolUse

PostToolUse is a hook for Claude Code from KhazP/vibe-coding-prompt-template. Its token cost is not measured, scanned A, original, MIT.

A post-tool hook configuration that runs a shell command after edit or write operations. For JavaScript and TypeScript files, it formats the file with Prettier when that formatter is installed.

In plain words
What is it for?
Use it in coding-agent workflows to trigger formatting after edits to JavaScript or TypeScript source files.
Why use it?
It keeps supported code files formatted automatically after changes.

Hook for Claude Code

One of 5 entries in settings.json — they are configured in one file and arrive together.

About the project

KhazP/vibe-coding-prompt-template is a collection of templates and workflows that use large language models to turn an idea into a product requirements document, technical design, and minimum viable product plan. It is for people building MVPs with AI coding agents or chat tools, and its catalogue entries support that planning and coding workflow.

KhazP/vibe-coding-prompt-template · 3,038 stars · on GitHub

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/khazp/vibe-coding-prompt-template/post-tool-use
Clone the repo
git clone --depth 1 https://github.com/KhazP/vibe-coding-prompt-template

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 PostToolUse

README.md
[![agentmods](https://agentmods.dev/badge/hooks/khazp/vibe-coding-prompt-template/post-tool-use.svg)](https://agentmods.dev/hooks/khazp/vibe-coding-prompt-template/post-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/khazp/vibe-coding-prompt-template/post-tool-use"><img src="https://agentmods.dev/badge/hooks/khazp/vibe-coding-prompt-template/post-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 original No closer match found in the catalogue.
Security

Grade A, and why

PostToolUse 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 5d 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

"command": "node -e \"const fs=require('fs'); const d=JSON.parse(fs.readFileSync(0,'utf8')); const p=d.tool_input?.file_path||''; if(/\\.(ts|tsx|js|jsx)$/.test(p) && fs.existsSync('node_modules/.bin/prettier')) { require
.claude/settings.json · 14 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Edit|Write",
      "hooks": [
        {
          "type": "command",
          "command": "node -e \"const fs=require('fs'); const d=JSON.parse(fs.readFileSync(0,'utf8')); const p=d.tool_input?.file_path||''; if(/\\.(ts|tsx|js|jsx)$/.test(p) && fs.existsSync('node_modules/.bin/prettier')) { require('child_process').execSync('npx prettier --write \\\"'+p+'\\\"', {stdio:'inherit'}); }\"",
          "timeout": 30000
        }
      ]
    }
  ]
}
Same file

What else settings.json configures

This page is one entry in a file that holds 5. 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. 5d ago First seen · 14 lines scan A c2e5b2d4c78c

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository KhazP/vibe-coding-prompt-template (3,038 stars, last pushed 14d 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 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.