This repository is an OpenAI Codex plugin marketplace. It contains the Onplana plugin — connect Codex to Onplana, an AI-native project & portfolio management (PPM) platform and the successor to Microsoft Project Online (retiring Sept 30, 2026).
In Codex, open Add plugin marketplace (or codex plugin marketplace add) and enter:
| Field | Value |
|---|---|
| Source | Onplana/onplana-codex-plugin |
| Git ref | main |
| Sparse paths | (leave blank) |
Leave Sparse paths empty so Codex pulls the marketplace manifest at
.agents/plugins/marketplace.jsontogether with the plugin. (Sparse paths are only useful for narrowing a large multi-plugin repo; this one is a single small plugin.)
Then enable the onplana plugin. It bundles the remote Onplana MCP server (https://mcp.onplana.com/mcp, OAuth 2.1 + DCR + PKCE) with a skill that teaches Codex the product model and common workflows. 250+ tools.
See plugins/onplana/README.md for what it does, authentication, and the full details.
plugins/
└── onplana/ the plugin (matches the openai/plugins marketplace layout)
├── .codex-plugin/plugin.json
├── .mcp.json remote Onplana MCP server (url)
├── skills/onplana/SKILL.md
└── assets/ icon (256²) + logo (1024²), brand blue #2563EB
OpenAI's official Plugin Directory self-serve publishing is rolling out; until then this repo is installable directly via the steps above. See the plugin README for details.
MIT — see LICENSE.