Uploaded May 2025 | Updated September 2026, 2 weeks ago

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Let's build an MCP STDIO server from scratch to understand how the the Model Context Protocol actually functions.

Part 1: Server - This video
Part 2: Client - youtu.be/S2x1bsMk19I
Part 3: AI - youtu.be/PD2ecDWbeNk

Gist: gist.github.com/jherr/3535c82ef14db4120481951f71c8df89
Code: github.com/jherr/diy-mcp/tree/main/server

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00:00 Introduction
05:52 What is STDIO?
06:59 STDIO in Node
08:02 DIY JSON-RPC
09:01 MCP Initialize
10:10 Adding Tools
13:29 Adding Resources
15:22 Adding Ping
15:52 Outroduction