Anthropic acquires Stainless

2 minute read | May.19.2026

Anthropic, a leading AI safety and research company, is acquiring Stainless, a leader in SDKs and MCP server tooling.

Orrick advised Anthropic.

THE IMPACT

The frontier of AI is shifting from models that answer to agents that act – and agents are only as capable as the systems they can reach. Anthropic is acquiring Stainless to extend that reach even further.

“Stainless has shaped how developers experience the Claude API since the start, and it’s been great to work with them on that,” said Katelyn Lesse, Head of Platform Engineering at Anthropic. “Agents are only as useful as what they can connect to. We’re excited to bring the Stainless team into Anthropic to advance Claude’s ability to connect to data and tools.”

THE TEAM

The deal team advising Anthropic was led by Mark Seneca, Kyle Zhu, Matthew Sawyer, Susana Min, Hilary Finkelstein and Charles Kauffman and by Laura Barr, Stephen Venuto and Jay Schau, with invaluable support from Christine McCarthy, Katherine Hogan, Sharon Zhou, Christina Bouchot, Lisa Bowman, Steven Malvey, Kimberly Loocke, Clem Roberts, Sarah Schaedler, Daniel Yost, Taylor Ranfos, Shannon Yavorsky, Carly Owens, Amy Ray, Victoria Newbold, Kristin Petersen, Jeanine McGuinness, Neetu Ahlawat, Allison Bradham, Christopher De Los Reyes, Laura Becking, Chanani Sandler, Deborah Abernathy and Marisol Sandoval.

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Laura Rose Barr パートナー

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