agentmods.dev

UserPromptSubmit

UserPromptSubmit is a hook for Claude Code from Yeachan-Heo/oh-my-codex. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A startup hook that runs your configured Node.js script after you submit a prompt but before the coding agent reads it.

In plain words
What is it for?
Use it for prompt logging, validation, or other automatic steps that should happen before every request.
Why use it?
It lets you prepare or check each request before the agent processes it.

Hook for Claude Code

Written for Claude Code: UserPromptSubmit hook event. Also seen: mentions Codex.

One of 8 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 7 are separate, each on its own page.

not rated 34krepo +36 3d ago A scan tokens not measured copy · 86% MIT

Good fit Use it for prompt logging, validation, or other automatic steps that should happen before every request.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/yeachan-heo/oh-my-codex/user-prompt-submit
View source ↗ Yeachan-Heo/oh-my-codex oh-my-codex.dev
About the project

oh-my-codex is a workflow layer for OpenAI Codex CLI that adds prompts, agent teams, skills, hooks, HUDs, and other runtime assistance while leaving Codex as the execution engine. It is for people who use Codex CLI and want structured workflows and additional help as tasks become larger. The catalogue entries are its skills, hooks, and MCP integrations for those Codex workflows.

Yeachan-Heo/oh-my-codex · 33,722 stars · on GitHub · oh-my-codex.dev

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.

Clone the repo
git clone --depth 1 https://github.com/Yeachan-Heo/oh-my-codex

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 UserPromptSubmit

README.md
[![agentmods](https://agentmods.dev/badge/hooks/yeachan-heo/oh-my-codex/user-prompt-submit/github.svg)](https://agentmods.dev/hooks/yeachan-heo/oh-my-codex/user-prompt-submit)
Your own site
<a href="https://agentmods.dev/hooks/yeachan-heo/oh-my-codex/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/yeachan-heo/oh-my-codex/user-prompt-submit/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for UserPromptSubmit

Your own site · 80×15
<a href="https://agentmods.dev/hooks/yeachan-heo/oh-my-codex/user-prompt-submit"><img src="https://agentmods.dev/badge/hooks/yeachan-heo/oh-my-codex/user-prompt-submit.svg" alt="Reviewed on agentmods" width="80" 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. A grade says what 26 rules found in the file — not that it is safe.
Origin 86% copy Near-identical to another mod in the catalogue.
Security

Grade A, and why

UserPromptSubmit 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 2mo 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

86% identical to SessionStart — 5 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.

plugins/oh-my-codex/hooks/hooks.json · 12 lines

What it actually says

{
  "UserPromptSubmit": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node \"${PLUGIN_ROOT}/hooks/codex-native-hook.mjs\""
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 8. 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. 2mo ago First seen · 12 lines scan A 6dc51739b760

Subscribe to this mod's changes

UserPromptSubmit is a hook published in the GitHub repository Yeachan-Heo/oh-my-codex (33,722 stars, last pushed 3d 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 86% identical to SessionStart, differing in 5 lines, and is treated as a copy.

Related

UserPromptSubmit compared with hooks from other repositories

UserPromptSubmit next to 6 hooks from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
UserPromptSubmitYeachan-Heo/oh-my-codexHook34k3d agoMITA—Claude Code
SessionStartsupabase/supabaseHook115ktodayApache-2.0A—Claude Code
PostToolUsesupabase/supabaseHook115ktodayApache-2.0A—Claude Code
SessionStartgoogle-gemini/gemini-cliHook109ktodayApache-2.0A—Claude Code
PreToolUseapache/supersetHook75ktodayApache-2.0A—Claude Code
PreToolUseanthropics/claude-cookbooksHook54k2d agoMITA—Claude Code
PostToolUseanthropics/claude-plugins-officialHook46ktodayApache-2.0A—Claude Code