PlanetScale Codex Plugin

Plugin for installing the PlanetScale MCP server, PlanetScale Skills, and Database Skills into Codex.

Install from GitHub

Add this repository as a marketplace, then install the plugin:

codex plugin marketplace add planetscale/codex-plugin

Or in the ChatGPT desktop app (Work mode or Codex), open Plugins, add the marketplace source, and install PlanetScale.

Verify it loaded

In the Codex TUI, run /mcp to see the PlanetScale MCP server.

If it does not appear immediately after install, restart Codex and check /mcp again. Plugin-provided MCP server changes are applied on restart. Authenticate with:

codex mcp login PlanetScale

Skills Source and Sync

This plugin pulls in skills from two upstream repositories via Git submodules:

Upstream	Submodule path	What it provides
planetscale/skills	skills	PlanetScale operating/assessment skills (safe orchestrator, inventory, Insights, Traffic Control, schema recommendations, and more)
planetscale/database-skills	database-skills	Engine skills for MySQL, Postgres, Vitess, and Neki

Both track main. Codex loads ./skills/ by default and also loads ./database-skills/skills/ via the plugin manifest.

Local bootstrap

Clone with submodules:

git clone --recurse-submodules https://github.com/planetscale/codex-plugin.git

If you already cloned without submodules:

git submodule update --init --recursive

Manual one-off update

To pull the latest upstream skills into this repository:

git submodule sync --recursive
git submodule update --init --remote database-skills skills

Commit the resulting submodule pointer changes in this repository.

Local testing

Add a personal or repo marketplace that points at this working copy, then install the plugin and restart the ChatGPT desktop app or Codex CLI.

Example personal marketplace entry (~/.agents/plugins/marketplace.json):

{
  "name": "local-planetscale",
  "interface": {
    "displayName": "Local PlanetScale"
  },
  "plugins": [
    {
      "name": "planetscale",
      "source": {
        "source": "local",
        "path": "./"
      },
      "policy": {
        "installation": "AVAILABLE",
        "authentication": "ON_INSTALL"
      },
      "category": "Developer Tools"
    }
  ]
}

When testing from a personal marketplace, copy or symlink this plugin directory under the marketplace root (for example ~/.codex/plugins/planetscale) and set source.path accordingly, or run:

codex plugin marketplace add /absolute/path/to/codex-plugin

1. Confirm the PlanetScale MCP server is listed (authentication required on first use).
2. Confirm PlanetScale operating skills (for example 00-safe-orchestrator) are available.
3. Confirm the MySQL, Postgres, Vitess, and Neki database skills are available.

Automated weekly updates

GitHub Actions runs .github/workflows/update-skills.yml weekly and also supports manual runs (workflow_dispatch).

When either submodule has new commits, the workflow opens or updates a PR that contains only:

• The database-skills and/or skills submodule pointer updates
• .gitmodules (if submodule metadata changed)