MCP Apps is now live as the first official MCP extension — tools can return interactive UI components that render directly in the conversation.
MCP Apps: Extending servers with interactive user interfaces
Introducing the MCP Apps Extension proposal (SEP-1865) to standardize interactive user interfaces in MCP, developed with the MCP-UI creators and maintainers from OpenAI and Anthropic.
MCP-UI | Interactive UI for MCP
Interactive UI for MCP - Build rich, dynamic interfaces with MCP-UI
Full Spec MCP: Hidden Capabilities of the MCP spec — Harald Kirschner, Microsoft/VSCode
MCPJam/inspector
Testing and evaluation platform to chat, inspect, and debug MCP servers, MCP apps, and ChatGPT apps.
Interactive connectors and MCP Apps | Claude
MCP Apps bring interactive connectors to Claude. Interact with connectors with a live UI right in your conversation — no tab-switching required.
Anthropic extends MCP with a UI framework
Anthropic is turning Claude into an app platform, with interactive widgets from Slack, Figma, Asana, and others.
Explosive MCP Adoption in 2 Years
Den Delimarsky, lead maintainer of the Model Context Protocol and Claude Code engineer at Anthropic, delivers a keynote on MCP's two-year journey from a basic protocol with two SDKs to the industry standard powering half a billion downloads per month. - **MCP's Origin Story** - Launched in November 2024 with a spec, two transports (STDIO and HTTP), two SDKs (Python and TypeScript), and a handful of clients including Claude Desktop - **Five Spec Releases** - Every revision was driven by community input, improving security, adding OAuth support, and simplifying the developer experience for building MCP clients and servers - **The March 2025 Inflection Point** - A 14-day window when major industry players publicly backed MCP, signaling enterprise adoption beyond the early enthusiast community - **MCP 2.0 Release** - The biggest spec update since launch, removing sessions for stateless deployment on AWS Lambda and Cloudflare Workers, and introducing the extensions framework - **Extensions Framework** - MCP Apps, Tasks, and Enterprise managed apps can now be tested as extensions before being added to the core specification - **Explosive Growth** - SDK downloads grew 13x year-over-year, reaching 500 million per month and 3.06 billion cumulative across Python, TypeScript, and C# alone - **Registry Scale** - The open-source MCP server registry surpassed 20,000 entries, a 45x increase since its September launch - **10 Official SDKs** - From the original two, MCP now supports Go (Google), C# (Microsoft), Kotlin (JetBrains), Swift, Rust, and more, each sponsored by major platform companies - **Community Momentum** - 184,000 GitHub stars, 2,500+ unique committers, 736 PRs merged and 600+ issues solved last month alone Whether you are building your first MCP server or scaling agent infrastructure across your organization, this keynote lays out exactly where the protocol stands and where it is heading. Links and Resources - MCP Specification: https://spec.modelcontextprotocol.io - MCP Blog: https://blog.modelcontextprotocol.io - MCP GitHub: https://github.com/modelcontextprotocol - Agentic AI Foundation: https://agenticaifoundation.org - Anthropic: https://www.anthropic.com Timestamps (approximate - adjust as needed) 00:00 Introduction 01:04 Two years of MCP: the origin story 02:43 MCP in 2024: the early days 03:40 Five spec releases in under two years 04:42 The 14 days that changed MCP adoption 05:39 MCP 2.0: the biggest release since launch 06:37 The extensions framework 07:04 MCP as enterprise agentic substrate 08:06 SDK download growth and registry scale 09:51 GitHub ecosystem metrics 11:04 From 2 SDKs to 10 11:55 Community momentum and contribution stats 12:16 Thank you to the MCP community #ModelContextProtocol #AgenticAI #MCPDevSummit
Chrome DevTools (MCP) for your AI agent | Blog | Chrome for Developers
Public preview for the new Chrome DevTools MCP server, bringing the power of Chrome DevTools to AI coding assistants.
Sam Altman on Twitter / X
people love MCP and we are excited to add support across our products. available today in the agents SDK and support for chatgpt desktop app + responses api coming soon!— Sam Altman (@sama) March 26, 2025
mattt/iMCP
A macOS app that provides an MCP server to your Messages, Contacts, Reminders and more
mattt/iMCP
A macOS app that provides an MCP server to your Messages, Contacts, Reminders and more
Connect any React application to an MCP server in three lines of code
We're open-sourcing use-mcp, a React library that connects to any MCP server in just 3 lines of code, as well as our AI Playground, a complete chat interface that can connect to remote MCP servers.
Claude Desktop Extensions: One-click MCP server installation for Claude Desktop
Claude Desktop Extensions: One-click MCP server installation for Claude Desktop
Enterprise MCP: lessons from GitHub's MCP server launch
GitHub's Engineer shares lessons from developing GitHub's MCP server. An Arcade MCP MVP interview.
Replit — Model Context Protocol (MCP): A Comprehensive Guide
Learn how Replit's Model Context Protocol (MCP) lets AI models access tools and data seamlessly using a simple, universal interface.
A Deep Dive Into MCP and the Future of AI Tooling | Andreessen Horowitz
We explore what MCP is, how it changes the way AI interacts with tools, what developers are already building, and the challenges that still need solving.
