A set of checks that runs after file edits and writing actions finish. It scans for hidden suppression markers, comments, and possible security issues in Python and JavaScript.

Use it after editing files to scan Python and JavaScript changes and check for suppression markers and comment-discipline issues.

It adds a review step after changes are made, helping identify suspicious markers, unwanted comments, and code that may need security attention.

PostToolUse — Hook by CATWILLgh

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/catwillgh/mainframe/post-tool-use

Clone the repo

git clone --depth 1 https://github.com/CATWILLgh/MAINFRAME

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 89% copy Near-identical to another mod 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 2d 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.

Origin

This is a copy

89% identical to UserPromptSubmit — 60 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

adapters/claude-code/plugin/hooks/hooks.json · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{
  "PostToolUse": [
    {
      "matcher": "Edit|Write|MultiEdit",
      "hooks": [
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/scan-suppression-markers.py"
          ]
        },
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/comment-discipline-reminder.py"
          ]
        },
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/python-security-scan.py"
          ]
        },
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/nodejs-security-scan.py"
          ]
        },
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/length-quality-note.py"
          ]
        },
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-telemetry-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/telemetry.py"
          ]
        }
      ]
    },
    {
      "matcher": "Write",
      "hooks": [
        {
          "type": "command",
          "command": "sh",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/run-hook.sh",
            "PostToolUse",
            "${CLAUDE_PLUGIN_

Read the full file on GitHub · 77 lines

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.

2d ago First seen · 77 lines scan A 1371acb70b98

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository CATWILLgh/MAINFRAME (2 stars, last pushed 11d 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. It is 89% identical to UserPromptSubmit, differing in 60 lines, and is treated as a copy.

Languages Security Writing and docs ai-coding-agent claude-code developer-tools hooks skills subagents

PostToolUse

Getting it into your agent

Grade A, and why

Nothing flagged

This is a copy

How it starts

What this file has done since we first saw it

Other hooks, from other repositories

PreCompact

PostToolUse

UserPromptSubmit

Stop

SessionStart

PostToolUse