MCP Apps

Build MCP tools that progressively enhance into sandboxed interactive interfaces. Keep every tool useful without UI support.

Verify the Current Baseline

Check the live packages and clone the matching official examples before implementation:

bun pm view @modelcontextprotocol/ext-apps version
bun pm view @modelcontextprotocol/sdk version
git clone --branch "v$(bun pm view @modelcontextprotocol/ext-apps version)" --depth 1 \
  https://github.com/modelcontextprotocol/ext-apps.git /tmp/mcp-ext-apps

The verified July 2026 baseline is Ext Apps 1.7.4 and MCP SDK 1.29.0. Treat those as a tested snapshot, not an evergreen instruction. Use Node 20+ semantics or a compatible Bun runtime.

Prefer the installed official skills: