agentmods.dev

PostToolUse

PostToolUse is a hook for coding agents from NeelPrime/arbiterx. Its token cost is not measured, scanned A, original, Apache-2.0.

A post-tool hook that runs after Write, Edit, or MultiEdit operations. It sends the changed file to ArbiterX for a gate check when ArbiterX is installed.

In plain words
What is it for?
Use it to run ArbiterX checks after coding-agent file edits.
Why use it?
It automatically checks files after they are modified, helping catch issues without requiring a separate manual command. If the check fails, the hook does not expose the error in its shown configuration.

Hook

Part of the arbiterx plugin — 3 skills, 3 hooks, 1 MCP server shipped together

One of 3 entries in hooks.json — they are configured in one file and arrive together.

2 1mo ago A scan tokens not measured original Apache-2.0
View the source file NeelPrime/arbiterx
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/neelprime/arbiterx/post-tool-use
Clone the repo
git clone --depth 1 https://github.com/NeelPrime/arbiterx

Or install arbiterx, the plugin that ships this one along with the rest of its 3 skills, 3 hooks, 1 MCP server.

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 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.

hooks/hooks.json · 13 lines

What it actually says

{
  "PostToolUse": [
    {
      "matcher": "Write|Edit|MultiEdit",
      "hooks": [
        {
          "type": "command",
          "command": "command -v arbiterx >/dev/null 2>&1 && arbiterx gate --file \"$CLAUDE_TOOL_INPUT_FILE_PATH\" --json 2>/dev/null || true"
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 3. 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. 3d ago First seen · 13 lines scan A c17851825e59

Subscribe to this mod's changes

PostToolUse is a hook published in the GitHub repository NeelPrime/arbiterx (2 stars, last pushed 1mo ago), 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.

aiai-code-qualityai-coding-assistantai-middlewareclaude-codecode-quality
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