Twenty Codex Plugin

Official Codex plugin for building, deploying, and querying Twenty apps. Bundles five focused skills, the public Twenty documentation MCP server, and a one-command workspace MCP setup helper.

This package is the source of the plugin published to the Codex marketplace.

What This Plugin Does

The plugin teaches Codex how to work with the Twenty CRM platform. After installation, Codex can:

Scaffold a new Twenty app with create-twenty-app.
Add or modify app entities (objects, fields, logic functions, layouts, front components, workflows).
Manage remotes, sync changes, build, deploy, view logs, and configure CI/CD.
Prepare README, marketplace metadata, logos, and screenshots for npm/marketplace publication.
Connect to a Twenty workspace via MCP and present records as readable Markdown with linked record names.

Installation

From the Codex Marketplace

Search for "Twenty" in the Codex plugin directory and install.

Locally for Development

Copy the marketplace template to a local marketplace config:

bash

cp packages/twenty-codex-plugin/templates/marketplace.example.json .agents/plugins/marketplace.json

Then enable it in Codex via the plugin manager. See templates/marketplace.example.json for the exact entry shape.

Skills

Skill	Use it for
`create-app`	Scaffold a new Twenty app with `create-twenty-app`.
`develop-app`	Add or modify objects, fields, logic functions, layouts, front components, workflows.
`manage-app`	Manage remotes, sync, build, deploy, logs, troubleshooting, CI/CD.
`publish-app`	Prepare README, marketplace metadata, logos, screenshots, public assets.
`use-twenty-mcp`	Configure Twenty MCP and retrieve workspace records as readable Markdown.

Cross-skill operating rules are in AGENTS.md. Reference docs are under references/.

MCP Setup

The plugin works in two layers:

The bundled twenty-docs MCP server works immediately and lets Codex search public Twenty documentation.
Workspace data access is user-specific. Each user adds their own Twenty workspace MCP endpoint to their private Codex MCP config using the helper below.

Do not add workspace-specific MCP URLs to this package. They are user-local and belong only in the user's machine-local Codex MCP configuration.

Quick MCP Setup

bash

bash packages/twenty-codex-plugin/scripts/setup-mcp.sh myworkspace.twenty.com

The helper names the server after the workspace host (twenty-myworkspace, twenty-acme-example, etc.). Codex may open OAuth automatically after the server is added; if it does not, run codex mcp login <server-name>. Use --force-login only for terminal-only setup.

Equivalent manual CLI setup:

bash

codex mcp add twenty-myworkspace --url https://myworkspace.twenty.com/mcp
codex mcp login twenty-myworkspace

Supported workspace forms:

text

myworkspace.twenty.com       -> https://myworkspace.twenty.com/mcp       name: twenty-myworkspace
acme.example.com             -> https://acme.example.com/mcp             name: twenty-acme-example
myworkspace.customdomain.com -> https://myworkspace.customdomain.com/mcp name: twenty-myworkspace-customdomain
myworkspace.localhost:3001   -> http://myworkspace.localhost:3001/mcp    name: twenty-myworkspace-localhost-3001

App Declaration

Codex app declarations require a ChatGPT-created app or connector id. The plugin can reference that id, but it cannot create one from an MCP URL by itself.

For that reason, this package does not ship a default .app.json. A bundled app declaration would either point to the wrong workspace or expose an app id that is not valid for each user's ChatGPT Developer Mode setup. Keep app declarations local until there is an official shared Twenty connector id.

After creating the Twenty app in ChatGPT Developer Mode with your workspace MCP URL, add packages/twenty-codex-plugin/.app.json:

json

{
  "apps": {
    "twenty": {
      "id": "asdk_app_OR_connector_ID_FROM_CHATGPT"
    }
  }
}

Then add "apps": "./.app.json" to packages/twenty-codex-plugin/.codex-plugin/plugin.json and include .app.json in this package's files array.

Development

Want to improve the plugin itself? See CONTRIBUTING.md for skill authoring, reference editing, validation, and the release process.

Common Commands

bash

# Validate the plugin
npx nx run twenty-codex-plugin:validate

# Run validator unit tests
npx nx run twenty-codex-plugin:test

Compliance

Best-practices compliance is tracked in CHECKLIST.md — every official Codex requirement maps to either an automated validate.js assertion or a manual sign-off. Changes are recorded in CHANGELOG.md.