Cloudflare AI Agents lead Sunil Pai departs the company amid reports he is joining Anthropic
today was my last day in cloudflare (again). the best career and opportunity in my whole life, and the closest friends I would die for. thank you to everyone who made it all so special. I had an incredible time. 🧡
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Sunil Pai architected PartyKit and Cloudflare's stateful AI Agents platform, making his departure a notable talent shift in the infrastructure race for long running, real time agent execution.
Sunil Pai founded real time multiplayer infrastructure startup PartyKit, which Cloudflare acquired in 2024 to power stateful WebSockets and Durable Objects workflows. At Cloudflare, Pai led developer tooling for the Cloudflare Agents SDK and Model Context Protocol integrations.
Deep dive
On October 23, engineer Sunil Pai announced that Friday was his final day at Cloudflare, thanking colleagues and calling his second stint at the company the best career opportunity of his life. Pai's farewell post drew more than 338,000 views and tributes from engineers across the JavaScript and edge computing ecosystem, including Cloudflare CEO Matthew Prince.
Pai joined Cloudflare in 2024 when the company acquired his real time collaborative infrastructure startup PartyKit. During his tenure, he helped build Cloudflare's AI Agents framework on top of Durable Objects, enabling stateful, long running agent sessions, WebSocket synchronization, and remote Model Context Protocol servers running at the network edge.
Several hours after Pai's farewell post, AI talent tracker account Arfur Grok reported in a quote post with nearly 100,000 views that Pai has joined Anthropic. While Pai himself had not formally announced his new employer on his own timeline as of Saturday afternoon, his expertise in stateful agent runtimes, real time client synchronization, and React based developer interfaces aligns closely with frontier labs expanding their desktop and cloud coding agent platforms.
What to expect next
As frontier labs compete on hosted agent execution, remote Model Context Protocol servers, and real time collaborative developer environments, recruiting veterans of edge runtime infrastructure will remain a priority across Anthropic, OpenAI, and cloud providers building next generation developer platforms that keep long running coding, browser, and desktop agents synchronized with human engineering teams across distributed cloud state and local machines.