mcp-apps-builder

# MCP Apps Builder (ext-apps Agent Skills bridge) The Model Context Protocol [ext-apps](https://github.com/modelcontextprotocol/ext-apps) repo ships **four official Agent Skills** that teach an AI coding agent how to build [MCP Apps](https://modelcontextprotocol.io/extensions/apps/overview) (SEP-1865 — interactive `ui://` UIs that render inside a chat host). This skill tells you when to reach for them and how to install them, so MCP App work is done with the canonical, up-to-date guidance instead of guesswork. ## The four builder skills | Skill | Use it when… | |---|---| | [`create-mcp-app`](https://github.com/modelcontextprotocol/ext-apps) | Scaffolding a **new** MCP App (server + interactive UI) from scratch. | | [`add-app-to-server`](https://github.com/modelcontextprotocol/ext-apps) | Adding an interactive `ui://` view to an **existing** MCP server's tools. | | [`migrate-oai-app`](https://github.com/modelcontextprotocol/ext-apps) | Converting an existing **OpenAI Apps SDK** app to MCP Apps. | | [`convert-web-app`](https://github.com/modelcontextprotocol/ext-apps) | Turning an existing **web app** into a hybrid web + MCP App. | ## Install / load them Pick whichever matches the agent you're driving (skills live in the agent's skills directory — install once, then ask the agent to build): - **Claude Code** (plugin marketplace): ``` /plugin marketplace add modelcontextprotocol/ext-apps /plugin install mcp-apps@modelcontextprotocol-ext-apps ``` - **Any agent** (Ve...