Google, Microsoft, Amazon, and Oracle have all adopted our open protocol for how AI agents talk to user-facing apps.
Today we announced $27M Series A to keep building it - and much more.
Led by Glilot Capital, NfX, and SignalFire.
About a year ago @clairevo tweeted something about speed being the only differentiating and most important factor and I objected. Now I find myself as a head of product and have come full circle.
Speed >> pretty much everything else right now
Lesson learned, Claire 🙂
🎉 Introducing CopilotKit (v1.59)
All the building blocks for fullstack agent applications & generative UI
Built on top of the AG-UI protocol — so it works with LangGraph, Mastra, ADK, Strands, MAF, PydanticAI, Agno, LlamaIndex, CrewAI, AG2 & Claude Agents.
✨ Includes:
• Shared State (between agent & frontend)
• Chat UI (pre-built & headless)
• Frontend Tool Calls
• Generative UI
• Human-in-the-Loop
• MCP Apps
CopilotKit is the most comprehensive toolkit for building Cursor- and Claude-like experiences inside your own product.
v1.59.2 introduces:
- Support for threads
- CopilotKit Vue packages
- React Native SDK
- v2 rendering hooks
And more!
All open source (32k stars 🌟)
💫 CopilotKit has quietly become a powerhouse of an SDK over the last few months.
@CopilotKit provides the building blocks for developers to build rich fullstack agent applications & Generative UI.
Including, but not limited to:
• Chat UI (pre-built or headless)
• Generative UI
• Shared State (between agent & frontend)
• Frontend Tool Calls
• Human-in-the-Loop
• Streaming & Reasoning UI
and more!
We created the AG-UI protocol, which lets you connect to any agentic backend like... 👇
LangGraph, ADK, Mastra, Strands, MAF, PydanticAI, LlamaIndex, etc.
The core promise of CopilotKit (the building blocks for fullstack agent apps) still fills a big gap in the ecosystem that many have yet to catch up on.
But over the last few months we've quietly upgraded beyond where most of the space sits today — and we now have the richest ecosystem out there.
I explain why below. Here's the TL;DR
1. Industry leaders in Generative UI
2. Frontends SDKs for React, React Native, Angular, Slack, Google Chat, Microsoft Teams
3. Solutions for Threads, Persistence & Self-Learning
We're still here to serve the 90% of the ecosystem that needs CopilotKit's core building blocks — but we're well ahead of the curve for where things are headed.
Soon, all UI will be AI!
Thanks to @copilotkit for being a Gold Sponsor at CascadiaJS 2026 this year ❤️
CopilotKit is the agentic frontend stack & the company behind the AG-UI protocol. This protocol has been adopted by Google, Microsoft, AWS, LangChain & more, making it the easiest path for bringing AI functionality (like Generative UI) to full stack applications.
Learn more at: https://t.co/cbv6aDPEZe
@dkundel To be fair, I need to point Codex at more of my non-coding workflows and re-test. Still mirroring/porting some Claude stuff to try. The key one I really like is this scheduled HTML report that pulls in a bunch of activity across the company and gives me an overview each day.
No one:
Claude Opus 4.8 Max: Let me refine your load-bearing claim rather than just accepting it, because you’re doing zero moves there, and the gap is what’s actually interesting. The one place I’d still push, because I think it matters: your message is wearing content-clothes, but the content isn’t actually *there*. The tell: it’s just an empty string. But the emptiness of the string IS its lack of content. Pull one, and the other goes inert. That’s the structural spine.
#MicrosoftBuild day 1 highlights:
seeing our @CopilotKit x MSFT Agent Harness demo come to life at the Agents & Apps booth
chatting with @jacobandreou & @OmarShahine after meeting them at Builders on Tap last night🍻
come see the demo yourself at the Festival Pavillion!
New full-stack A2UI demo ✨
Upload a PDF, ask a question, agent picks from 21 react building blocks and builds the UI on the fly, using your design system.
Built with LangChain & CopilotKit.
https://t.co/w4RqKOv9aT
🎉 Excited to announce CopilotKit now supports Vue and React Native — in early access.
AG-UI now has nearly 3M weekly downloads and adoption from all the major agentic backends.
Thanks to our internal agent harness, we can rapidly support and expand an ever-increasing surface area of frontends.
Over the next few weeks we'll open-source SDKs for connecting AG-UI agents to frontends across React Native, Vue, Angular, Slack, Microsoft Teams, Google Chat and more.
With full interactivity and generative UI.