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Mock MCP Apps Server

Mock MCP Apps Server

by dganesh5

Mock MCP Apps Server

A local, no-auth FastAPI + FastMCP server exposing MCP over Streamable HTTP at POST /v1/mcp, with a React 18 + Vite widget frontend built on @modelcontextprotocol/ext-apps.

Two mocked tools:

  • get_weather_forecast — returns a mocked 5-day forecast and renders an interactive widget.

  • list_supported_cities — plain text list of mocked cities (no widget).

No auth of any kind. Intended for local development and testing against MCP hosts (ChatGPT dev mode, Claude, MCP Inspector) via a tunnel like ngrok.

Quickstart

poetry install
cd app/web && npm install && npm run build && cd ../..
./start_mcp.sh

This starts:

Port

What

8000

FastAPI + MCP (/v1/mcp, /health, /apidoc/swagger)

4444

Static widget assets (CORS-enabled)

To expose it to a remote MCP host:

ngrok http 8000

Then add https://<your-ngrok-domain>/v1/mcp as a custom connector in the host.

Related MCP server: weather mcp

Smoke test

curl -s http://localhost:8000/health

curl -s -X POST http://localhost:8000/v1/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

See docs/MOCK_MCP_APP_RECREATION_GUIDE.md for the full spec this project implements.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

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