ultracodex

ultracodex is a plugin for Claude Code from southlab-ai/Claude-Plugin-Marketplace. Its manifest loads nothing; the 2 skills it bundles cost 193 tokens per session together, scanned A, original, MIT.

A plugin that coordinates several OpenAI Codex agents from Claude Code, including individual background agents and groups for audits, reviews, migrations, and design discussions.

In plain words
What is it for?
Use it to run multi-agent code audits, code reviews, migrations, design panels, or background coding work.
Why use it?
It lets different agents work on separate parts or viewpoints of a coding task, which can help with broad reviews and complex changes.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest. Also seen: mentions Claude Code; mentions Codex.

Good fit Use it to run multi-agent code audits, code reviews, migrations, design panels, or background coding work.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add southlab-ai/Claude-Plugin-Marketplace/plugin install ultracodex
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/southlab-ai/Claude-Plugin-Marketplace

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 ultracodex

README.md
[![agentmods](https://agentmods.dev/badge/plugins/southlab-ai/claude-plugin-marketplace/ultracodex/github.svg)](https://agentmods.dev/plugins/southlab-ai/claude-plugin-marketplace/ultracodex)
Your own site
<a href="https://agentmods.dev/plugins/southlab-ai/claude-plugin-marketplace/ultracodex"><img src="https://agentmods.dev/badge/plugins/southlab-ai/claude-plugin-marketplace/ultracodex/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 ultracodex

Your own site · 80×15
<a href="https://agentmods.dev/plugins/southlab-ai/claude-plugin-marketplace/ultracodex"><img src="https://agentmods.dev/badge/plugins/southlab-ai/claude-plugin-marketplace/ultracodex.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 The manifest loads nothing itself; its 2 skills cost 193 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

ultracodex 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 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

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.

plugins/ultracodex/.claude-plugin/plugin.json · 12 lines

What it actually says

{
  "name": "ultracodex",
  "description": "Orchestrate a fleet of OpenAI Codex agents (GPT-5.6 sol/terra/luna) from Claude Code — ultracode-style multi-agent audits, reviews, migrations, and design panels. Includes a codex-agent skill for spawning single background Codex workers.",
  "version": "1.0.0",
  "author": {
    "name": "Southlab AI"
  },
  "repository": "https://github.com/southlab-ai/Claude-Plugin-Marketplace",
  "license": "MIT",
  "keywords": ["codex", "openai", "gpt-5.6", "multi-agent", "orchestration", "fleet", "audit", "code-review", "background-agents"]
}
Contents

What it installs

The manifest is a name and a version. 2 skills travel with it, and installing the plugin installs all of them — 193 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. 9d ago First seen · 12 lines scan A 816853fd8abe

Subscribe to this mod's changes

ultracodex is a plugin published in the GitHub repository southlab-ai/Claude-Plugin-Marketplace (2 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.