agentmods.dev

PreToolUse

A pre-tool hook that runs a Node.js check before the agent uses apply_patch, the tool that edits files.

In plain words
What is it for?
Use it to run pre-edit-check.mjs before file patches, helping inspect risks and related file-change history before an edit.
Why use it?
It adds a workspace check before code changes are applied. The supplied configuration says the check examines workspace fragility and co-change history.

Hook

2 8d ago A scan tokens not measured original Apache-2.0
View the source file workspace-json/codex-mcp
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/workspace-json/codex-mcp/pre-tool-use
Clone the repo
git clone --depth 1 https://github.com/workspace-json/codex-mcp
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": "^apply_patch$",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$PLUGIN_ROOT/hooks/pre-edit-check.mjs\"",
          "timeout": 10,
          "statusMessage": "Checking workspace fragility and co-change history"
        }
      ]
    }
  ]
}
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 9613fa5e45f1

Subscribe to this mod's changes

PreToolUse is a hook published in the GitHub repository workspace-json/codex-mcp (2 stars, last pushed 8d 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.

Securityagent-hooksco-changecodebase-intelligencecodexfragilitymcp
Related

Other hooks, from other repositories

PostToolUse

Runs after a tool call finishes for Edit and Write tool calls, executing docs-build-check.sh and py-typecheck-flag.sh (2 commands). From cocoindex-io/cocoindex.

cocoindex-io/cocoindex · not measured

Stop

Runs when the agent finishes a response, executing docs-build-run.sh and py-typecheck-run.sh (2 commands). From cocoindex-io/cocoindex.

cocoindex-io/cocoindex · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From CodelyTV/agent-harness.

CodelyTV/agent-harness · not measured

PostToolUse

Runs after a tool call finishes for Write tool calls, running an inline shell check. From All-The-Vibes/ATV-PaperBoard.

All-The-Vibes/ATV-PaperBoard · not measured

Notification

Runs when the agent sends a notification, executing run-hook.cmd. From young1the/pets-driven.

young1the/pets-driven · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing run-hook.cmd. From young1the/pets-driven.

young1the/pets-driven · not measured