MCP · Full build

MCP, From Scratch

Build a small but complete web app — database, API, auth, frontend — then give it an AI interface without changing a line of the app. A FastAPI backend, an MCP server, a React frontend, and a LangGraph chat client, in four independent containers. Every line explained; code pinned to real commits in the companion repo.

Code & notebooks on GitHub

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The Setup: What We’re Building

~10 min read

Phase 0Setup

The map for the series: TaskFlow, four containerised services, and the one decision that shapes everything — the MCP server calls the API, not the database, and forwards the user’s own token. Plus the folder layout, the Compose file, and the commit to clone from.