MCP Apps
Official MCP extension that lets tools return interactive HTML interfaces rendered in a sandboxed iframe inside the chat.
Reference by Model Context Protocol project
IndexedLicense unknown★ 3,007
About
Defines how a tool declares a ui:// resource and how the embedded app and host talk over a postMessage JSON-RPC bridge.
Use cases: frontend-development
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About the protocol
- Current version
- 2026-01-26github.com
- Maintainer
- Model Context Protocol projectblog.modelcontextprotocol.io
- Launched
- 2026-01-26blog.modelcontextprotocol.io
- Builds on patterns from MCP-UI and the OpenAI Apps SDK. blog.modelcontextprotocol.io
- Supported by Claude, VS Code GitHub Copilot, Microsoft 365 Copilot, Goose and Postman, among others. modelcontextprotocol.io
Signals
- Stars
- 3,007
- Forks
- 419
- Open issues
- 132
- Last commit
- Oct 23, 2026 (5 days ago)
- Last release
- Sep 25, 2026 (1 month ago)
From GitHub (fetched Oct 24, 2026).
Details
- Version
- 2026-01-26
- License
- License unknown
- Repository
- github.com/modelcontextprotocol/ext-apps
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
Cite this page
MCP Apps. Agent Mart. https://agentmart.dev/reference/mcp-apps (last updated 2026-10-24)