ui-widget-developer
Copilot MCP Server Development
🔀 PATH SELECTION
Before proceeding, ask the user which path they want to take using AskUserQuestion. Both are supported for M365 Copilot widget rendering. Present the tradeoffs and let them choose:
| OAI Apps (this skill) | MCP Apps Extension (modelcontextprotocol/ext-apps) |
|
|---|---|---|
| Standard | OpenAI-specific | Official MCP standard |
| Works in | ChatGPT + M365 Copilot | M365 Copilot, ChatGPT, VSCode, and more |
| Maturity | Battle-tested, production-ready | New official standard, growing ecosystem |
| Design | OpenAI Apps SDK | MCP Apps protocol (cross-platform) |
| When to choose | Existing OAI app investment | Prefer the open standard, want broadest client support |
Ask: "Would you like to build an OAI app (OpenAI Apps SDK — battle-tested, works in ChatGPT and M365 Copilot) or an MCP app (new official standard — works in M365 Copilot, ChatGPT, VSCode, and more)?"
- OAI apps → Continue below. This skill covers everything you need.
- MCP apps → Install the
modelcontextprotocol/ext-appsplugin (see below), then use the appropriate skill from that plugin.
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