One Year of MCP: November 2025 Spec Release

Today, MCP turns one year old . You can check out the original announcement blog post if you don’t believe us. It’s hard to imagine that a little open-source experiment, a protocol to provide context to models , became the de-facto standard for this very scenario in less than twelve months. But not only do we hit the first anniversary milestone today - we’re also releasing a brand-new MCP specification version. Before we get to the details of what’s new, let’s do a bit of a retrospective. A Year In With all the changes that we’ve made in the past year, it feels like a decade flew by. The proto