MCP Server Guide: Build with the New SDK and Wire into Claude Code

On October 3, 2026, DEV Community's AI section published a guide titled "How to Build Your First MCP Server: Step-by-Step Guide for Developers (2026)". The piece walks through building a working MCP server with the current SDK, testing it in the MCP Inspector, and connecting it to Claude Code, and it also collects the mistakes other developers tend to run into along the way.

The guide carries a warning as well: the MCP protocol shipped its largest revision to date on July 28. Readers who followed an MCP tutorial last year may find that their code no longer matches the official docs, so a setup assembled the old way is not guaranteed to work. The article points to that gap between tutorial code and official documentation as the thing to watch for.

As of this report, matters rest with the publication of the guide itself. The material does not say who issued the July 28 revision, what it changed, or which versions of the MCP Inspector and Claude Code the walkthrough assumes. What can be checked from the source is the publication date, the tools and products it covers, and the claim that the July 28 revision was the protocol's biggest so far.