Citadel Harness plugin for Codex

CommunityPluginDeveloper Tools

Codex-native agent orchestration harness for durable campaigns, skills, hooks, telemetry, and parallel work.

How to install Citadel Harness in Codex

1. Add the repo as a Codex plugin marketplace:

codex plugin marketplace add SethGammon/Citadel

2. Install the plugin from it:

codex plugin add citadel@citadel-local

This repo ships a Codex marketplace file (.agents/plugins/marketplace.json). The first command adds it as a marketplace (Codex CLI reference); the second installs the plugin 'citadel'. 'citadel-local' is the marketplace name from that file. Check the repo README too. Command format: Codex CLI reference.

What it contains

Plugins in this marketplace (1)

  • citadel — Codex-native agent orchestration harness for durable campaigns, skills, hooks, telemetry, and parallel work.

Example prompts from the manifest

  • Use Citadel to route this task through the right skill and verification loop.
  • Use Citadel to continue the active campaign and report current state.

About this listing

Citadel Harness is a community plugin on GitHub by SethGammon, tagged codex-plugin. It passed the CodexStacks quality filter (at least 10 stars, pushed in the last 180 days, not a fork, has a description and a manifest or README). OpenAI hasn't reviewed it and we haven't tested it. From its files we found 1 plugin. The manifest says version 1.4.3. It's one of 79 listings in the Developer Tools category.

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Citadel Harness FAQ

How do I install Citadel Harness in Codex?

Add the repo as a Codex plugin marketplace with codex plugin marketplace add SethGammon/Citadel, then install it with codex plugin add citadel@citadel-local. Both use the command format from the Codex CLI reference; check the repo README too.

Is Citadel Harness an official Codex plugin?

No. Citadel Harness is a community repo on GitHub by SethGammon. It passed the CodexStacks quality filter, but OpenAI hasn't reviewed it and we haven't tested it, so read the code before you install it.

What does Citadel Harness include?

From its manifest and repo files, Citadel Harness includes 1 plugin: citadel.

Details

Type
Plugin
Category
Developer Tools
Source
Community
Author
Citadel
Version
1.4.3
License
MIT
GitHub stars
923 (at last sync)
Last push
2026-10-16
Manifest
.agents/plugins/marketplace.json
GitHub topics
agent-orchestration, agent-workflow, ai-agents, claude-code-plugin, claude-plugins, developer-tools, mcp
Source
https://github.com/SethGammon/Citadel
Website
https://sethgammon.github.io/Citadel/
Listed via
GitHub topic codex-plugin
Tested by CodexStacks
Not yet

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Listed on CodexStacks

Markdown

[![Listed on CodexStacks](https://codexstacks.com/badge.svg)](https://codexstacks.com/p/citadel/)

HTML

<a href="https://codexstacks.com/p/citadel/"><img src="https://codexstacks.com/badge.svg" alt="Listed on CodexStacks" width="172" height="28"></a>

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Citadel HarnessCommunity Codex plugin · 1 pluginCodex-native agent orchestration harness for durable campaigns, skills, hooks, telemetry, and parallel work.View on CodexStacks →
<a href="https://codexstacks.com/p/citadel/" style="display:block;max-width:380px;box-sizing:border-box;padding:14px 16px;border:1px solid #3a2c26;border-radius:12px;background:#0d0b0a;color:#f3ece6;font:14px/1.45 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-decoration:none"><span style="display:block;font-size:16px;font-weight:700;color:#f3ece6">Citadel Harness</span><span style="display:block;margin:2px 0 8px;font-size:12px;color:#b5a9a1">Community Codex plugin · 1 plugin</span><span style="display:block;margin:0 0 10px;color:#ddd3cc">Codex-native agent orchestration harness for durable campaigns, skills, hooks, telemetry, and parallel work.</span><span style="font-size:12px;font-weight:600;color:#ffb347">View on CodexStacks →</span></a>

Markdown summary

**[Citadel Harness on CodexStacks](https://codexstacks.com/p/citadel/)**: Community Codex plugin with 1 plugin.

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