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The official Ruby SDK for the Model Context Protocol is now a Tier 1 SDK, as recorded in the Tier 1 assessment under the SDK tiering system. Ruby joins TypeScript, Python, C#, Go, and Rust as the sixth Tier 1 SDK, meeting the tier’s requirements for full feature support, a 100% conformance pass rate

Today we’re excited to publish an updated roadmap for the Model Context Protocol (MCP), covering the next specification release and beyond. It sets the direction for protocol work over the coming months and was developed by the Core Maintainers together with our community of maintainers and Working

Since our last November release MCP continued to grow at an astonishing rate. Across our Tier 1 SDKs, we’re seeing close to half-a-billion downloads a month, with both TypeScript and Python SDKs crossing the 1 billion total downloads threshold. In just a few months, the protocol continued to grow as

Version 1.0.0 of the official Ruby SDK for the Model Context Protocol is now available. This is the first stable release of the mcp gem: the public API is now stable, and breaking changes ship only in major releases, following the Semantic Versioning policy documented in VERSIONING.md. Alongside the

The MCP protocol is about to undergo its biggest revision since launch. As you might’ve seen from our recent release candidate announcement, the new protocol revision goes stateless, removing the initialize handshake and the protocol-level session, and completing the plan we laid out in The Future o

The Enterprise-Managed Authorization extension is now stable. Organizations can centrally manage authorization for MCP servers and end-users can access all connected MCP servers through a single log in. The extension is being adopted by Anthropic, Microsoft, Okta and a growing number of MCP servers.

The release candidate for MCP 2026-07-28 is now available. It is the largest revision of the protocol since launch and delivers on the 2026 roadmap: a stateless core that scales on ordinary HTTP infrastructure extensions including server-rendered UIs through MCP Apps and long-running work through th

I’m happy to share two updates to the maintainer team: Clare Liguori is joining the Core Maintainer group, and Den Delimarsky is joining me as a Lead Maintainer. When we introduced the MCP governance model last summer, the goal was to make sure the protocol could keep growing without any one person

MCP tool annotations were introduced nearly a year ago as a way for servers to describe the behavior of their tools — whether they’re read-only, destructive, idempotent, or reach outside their local environment. Since then, the community has filed five independent Specification Enhancement Proposals

MCP’s current spec release came out in November 2025. We haven’t cut a new version since, but the project hasn’t stood still. Over the past year MCP has moved well past its origins as a way to wire up local tools. It now runs in production at companies large and small, powers agent workflows, and is

Today, we’re announcing that MCP Apps are now live as an official MCP extension. Tools can now return interactive UI components that render directly in the conversation: dashboards, forms, visualizations, multi-step workflows, and more. This is the first official MCP extension, and it’s ready for pr

A lot has happened since we first released MCP. We wrapped up 2025 with a major spec update and the momentum hasn’t slowed down. None of it would have happened without the community: every PR, every issue filed, every server and client built. That energy is what keeps MCP moving forward. To keep tha

When MCP first launched in November of 2024, quite a few of its users relied on local environments, connecting clients to servers over STDIO. As MCP became the go-to standard for LLM integrations, community needs evolved, leading to the build-out of infrastructure around remote servers. There’s now

Today marks a major milestone for the Model Context Protocol. Anthropic is donating MCP to the Agentic AI Foundation, a directed fund under the Linux Foundation. MCP will become a founding project of the newly created foundation. In one year, MCP has become one of the fastest-growing and widely-adop

We’re updating how Specification Enhancement Proposals (SEPs) are submitted and managed. Starting today, SEPs will be created as pull requests to the seps/ directory instead of GitHub issues. Why the Change? When we introduced SEPs in July, we chose GitHub Issues as our starting point. Issues are fa