PostToolUse

A hook that runs checks and formatting after certain file-editing tool calls finish. A hook is an automatic action triggered by another action.

In plain words
What is it for?
Use it after supported write or edit operations to run the listed formatting, linting, reference, plan, and handoff checks.
Why use it?
It catches formatting, YAML, reference, planning, and handoff problems without requiring each check to be started manually.

Hook for Claude Code

Part of the claude-kit plugin — 9 skills, 7 commands, 4 agents, 16 hooks, 3 MCP servers shipped 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/hex0xdeadbeef/claude-kit/post-tool-use
Clone the repo
git clone --depth 1 https://github.com/hex0xdeadbeef/claude-kit

Made for: Claude Code.

Or install claude-kit, the plugin that ships this one along with the rest of its 9 skills, 7 commands, 4 agents, 16 hooks, 3 MCP servers.

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 unknown No closer match found in the catalogue.
Security

Grade A, and why

PostToolUse 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.

.claude/hooks/hooks.json · 112 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

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 · 112 lines scan A 5e81cc283c12

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository hex0xdeadbeef/claude-kit (46 stars, last pushed 1mo ago), 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 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.