Anthropic acquires Stainless

Anthropic acquired Stainless , a company focused on SDK and MCP server tooling.

Founded in 2022, Stainless generates SDKs, CLIs, and MCP servers from API specifications across languages including TypeScript, Python, Go, Java, and Kotlin. Anthropic said Stainless has powered all official Anthropic SDKs since the early days of the Claude API.

The acquisition is aimed at expanding Claude’s ability to connect with external tools and data sources as Anthropic pushes further into AI agents and developer tooling.

Anthropic created the Model Context Protocol (MCP), an open standard designed to connect AI models with external systems and applications.

“Stainless has shaped how developers experience the Claude API since the start, and it’s been great to work with them on that. 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.” – Katelyn Lesse, Head of Platform Engineering at Anthropic.