Anthropic announced it has acquired Stainless, a company specializing in SDKs and MCP server tooling designed to help developers and AI agents connect with APIs and external systems.
Founded in 2022, Stainless has worked closely with Anthropic since the early days of the Claude API and has powered the generation of every official Anthropic SDK. The company’s platform enables developers to automatically generate SDKs, CLIs, and MCP servers across programming languages including TypeScript, Python, Go, Java, and Kotlin. These tools help developers and AI agents interact more efficiently with APIs and external applications.
Anthropic said the acquisition reflects the broader shift in artificial intelligence from models that primarily answer questions to agents capable of taking actions across connected systems. The company emphasized that agent performance depends heavily on the ability to securely and reliably connect to tools, data sources, and APIs.
Anthropic noted that hundreds of companies currently rely on Stainless technology to generate developer tooling and integrations. By combining the Stainless team with Anthropic’s existing platform organization, the company plans to strengthen Claude’s connectivity capabilities and improve the overall developer experience for building AI-powered applications and agents.
Anthropic also highlighted the role of MCP, the Model Context Protocol it created to standardize how AI agents connect to external tools and systems. The acquisition is expected to further expand Claude’s ability to integrate with APIs and enterprise workflows.
KEY QUOTES:
“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, Anthropic
“I started Stainless because SDKs deserve as much care as the APIs they wrap. Anthropic was one of the first teams to bet on this with us. We have been watching what developers have built on Claude over the last few years, which made bringing our teams together an easy decision. The team gets to keep doing the work we love, on the platform where it matters most.”
Alex Rattray, Founder and CEO, Stainless
