PostToolUse

PostToolUse is a hook for Claude Code from k9aif/k9-aif-framework. Its token cost is not measured, scanned A, original, Apache-2.0.

A set of automatic checks that run after files are written or edited. The checks cover Python syntax, YAML configuration, tests, governance rules, and required initialization documentation in the K9-AIF framework.

In plain words
What is it for?
Use it in a K9-AIF project to validate edited Python and YAML files, run ABB tests, check governance, and verify initialization documentation.
Why use it?
It catches common errors immediately after a change and checks that the project follows its required rules. These checks run as post-edit hooks, so developers do not need to start each one manually.

Hook for Claude Code

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else.

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

Install

Getting it into your agent

There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.

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/k9aif/k9-aif-framework/post-tool-use.svg)](https://agentmods.dev/hooks/k9aif/k9-aif-framework/post-tool-use)
Your own site
<a href="https://agentmods.dev/hooks/k9aif/k9-aif-framework/post-tool-use"><img src="https://agentmods.dev/badge/hooks/k9aif/k9-aif-framework/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 0 findings. Scan, not verified.
Origin original 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 4d 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/settings.json · 59 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "/Users/ravinatarajan/ai/k9-aif-framework/.claude/hooks/check-python.sh",
          "timeout": 30,
          "statusMessage": "Checking Python syntax..."
        }
      ]
    },
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "/Users/ravinatarajan/ai/k9-aif-framework/.claude/hooks/check-yaml.sh",
          "timeout": 30,
          "statusMessage": "Validating YAML..."
        }
      ]
    },
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "/Users/ravinatarajan/ai/k9-aif-framework/.claude/hooks/run-abb-tests.sh",
          "timeout": 90,
          "statusMessage": "Running ABB tests..."
        }
      ]
    },
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "/Users/ravinatarajan/ai/k9-aif-framework/.claude/hooks/check-governance.sh",
          "timeout": 10,
          "statusMessage": "Checking governance..."
        }
      ]
    },
    {
      "matcher": "Write|Edit",
      "hooks": [
        {
          "type": "command",
          "command": "/Users/ravinatarajan/ai/k9-aif-framework/.claude/hooks/check-init-docstring.sh",
          "timeout": 10,
          "statusMessage": "Checking __init__.py docstring..."
        }
      ]
    }
  ]
}
Same file

What else settings.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. 4d ago First seen · 59 lines scan A e43b85f334a3

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository k9aif/k9-aif-framework (2 stars, last pushed today), licensed Apache-2.0. 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.