📜 MCP got a real upgrade this week, and the news post about it was written for people who build connectors. Fair enough. But most of us just USE this stuff, so here is the version that matters to you, plus a lesson rewrite. ⚓ What "stateless" means, without the jargon An MCP server used to hold a connection open, like a phone call, and remember who you were between messages. As of July 28 it does not. Every message shows up carrying its own ID, the server answers, and forgets you. Sounds like a downgrade. It is the opposite. Three things fall out of it: - Servers got simpler to build. Less code, fewer things to break. - Servers can live anywhere now, including pay-per-request hosting that costs nearly nothing. - Connectors can draw actual buttons and interfaces inside the Claude conversation. That one is new and it is called MCP Apps. Does this break your setup? No. If you have MCP servers running on your own machine, nothing changes. Carry on. ——— ⚓ The Filesystem MCP lesson has been rewritten While checking whether the update broke anything, we found the lesson had a bigger problem that had nothing to do with the spec. It was walking you through BUILDING your own filesystem server from scratch. Ten steps. Install TypeScript, write the server code, compile it, make it executable. There has been an official prebuilt version this whole time. It is one config block and a restart. That is fixed. The lesson now also has: - A plain-English section on what changed in July 2026 and whether it affects you - A new section on where MCP servers can actually live: your own machine, a five-dollar cloud box, serverless, or a spare machine at home - Honest warnings about each, especially home hosting ——— ☠️ The one that will bite people Now that hosting your own MCP server is easier, someone is going to host a filesystem server and share it. Do not do that. The filesystem server hands out read and write access to your folders. It is built for one person on one machine. Putting it online is handing strangers your hard drive.