Sam Julien

Building product @CopilotKit, instructor @eggheadio. Professional gate-opener. Improve as a dev/dev adv/PM at ✉️.

[Sam Julien @samjulien]

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.

[Sam Julien @samjulien]

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 🙂

[Sam Julien @samjulien]

@paw_lean @sofiiiiiasz @jxnlco @OpenAI @CopilotKit This is a much-needed collab!

[Sam Julien @samjulien]

@crtr0 Well done on another year Carter, looks like it was awesome and I heard great things from the team!

[Sam Julien @samjulien]

Excellent write-up on the generative UI ecosystem.

[Shubham Saboo @Saboo_Shubham_]

https://t.co/w7v8Vq1JNN

[Shubham Saboo @Saboo_Shubham_]

https://t.co/w7v8Vq1JNN

[CopilotKit🪁 @CopilotKit]

🎉 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 🌟)

[Atai Barkai @ataiiam]

💫 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!

[CascadiaJS 🇺🇸 🇨🇦 @CascadiaJS]

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

[Sam Julien @samjulien]

@dkundel Oo I will try that, thanks Dominik!

[Sam Julien @samjulien]

Okay Codex for coding, Claude for non-coding seems to be the move for now

[Sam Julien @samjulien]

@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.

[Sam Julien @samjulien]

It is so infuriatingly insufferable. I am such an Anthropic and Claude Code stan but I can’t handle Opus’ pseudo-intellectual slop these days.

[davidad 🎇 @davidad]

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.

[sofía🪁 @sofiiiiiasz]

#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!

[CopilotKit🪁 @CopilotKit]

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

[Atai Barkai @ataiiam]

🎉 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.

[Sam Julien @samjulien]

@dkundel Epic team-up!

[Sam Julien @samjulien]

All early release chapters here on the O’Reilly platform: https://t.co/GkFmdrwJ3b

[Sam Julien @samjulien]

All eight chapters are up in early release for Agentic GraphRAG!

Would love for you to check them out and give us feedback. Link below…

[Sam Julien @samjulien]

@paw_lean @OpenAI I knew it! Huge congratulations @paw_lean! 🎉

[Sam Julien @samjulien]

@CopilotKit @jamonholmgren check this out! Would love your feedback