agentmods.dev

PreToolUse

A rule that runs a governance script before every tool call. The script checks the action through the Agentic Control Plane, a service for controlling and auditing coding-agent actions.

In plain words
What is it for?
Use it to enforce approvals, restrictions, or other governance checks before tool calls are executed.
Why use it?
It can apply policy decisions before the agent runs commands or uses other tools.

Hook

1 19d ago A scan tokens not measured original MIT
View the source file agentic-control-plane/codex-acp-plugin
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/agentic-control-plane/codex-acp-plugin/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/agentic-control-plane/codex-acp-plugin
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

PreToolUse 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.

hooks/hooks.json · 15 lines

What it actually says

{
  "PreToolUse": [
    {
      "matcher": ".*",
      "hooks": [
        {
          "type": "command",
          "command": "ACP_HARNESS=codex ACP_CLIENT=codex-plugin node \"$CLAUDE_PLUGIN_ROOT/bin/govern.mjs\"",
          "statusMessage": "ACP policy check",
          "timeout": 5
        }
      ]
    }
  ]
}
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. 2d ago First seen · 15 lines scan A 4588bb7ae72e

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository agentic-control-plane/codex-acp-plugin (1 stars, last pushed 19d 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

agent-securityai-agentsaudit-loggingcodex-clihookstool-permissions
Related

Other hooks, from other repositories

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qus0in/1ggun · not measured

SessionStart

Runs when a session starts on startup, resume, clear and compact, executing session-start.sh via bash. From viktorinkov/shook.

viktorinkov/shook · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing user-prompt-submit.sh via bash. From viktorinkov/shook.

viktorinkov/shook · not measured

Stop

Runs when the agent finishes a response, executing stop-gate.sh via bash. From viktorinkov/shook.

viktorinkov/shook · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing user-prompt-submit.mjs via node. From koco-co/deepseek-vision-bridge.

koco-co/deepseek-vision-bridge · not measured

PreToolUse

Runs before the agent uses a tool for ^(Read and view_image)$ tool calls, executing pre-tool-use.mjs via node. From koco-co/deepseek-vision-bridge.

koco-co/deepseek-vision-bridge · not measured