Anthropic acquires Stainless to bolster Claude agent connectivity
The acquisition of Stainless, a specialist in SDKs and Model Context Protocol tooling, is designed to enhance the developer experience and expand the reach of the Claude platform.
Anthropic has acquired Stainless, a technology provider specialising in software development kits (SDKs) and Model Context Protocol (MCP) server tooling. The move is intended to strengthen agent connectivity and improve the developer experience for the Claude platform, aligning with the company’s broader strategy to shift from models that merely answer to agents that act.
Founded in 2022, Stainless has been integral to the Anthropic ecosystem, generating every official Anthropic SDK since the API’s inception. The company converts API specifications into code for multiple programming languages, including TypeScript, Python, Go, Java, and Kotlin. Hundreds of firms rely on Stainless to produce the libraries, command-line tools, and connectors that allow developers and agents to interact with APIs.
Katelyn Lesse, Head of Platform Engineering at Anthropic, emphasised the strategic importance of the acquisition. “Agents are only as useful as what they can connect to,” Lesse said. “We’re excited to bring the Stainless team into Anthropic to advance Claude’s ability to connect to data and tools.”
Alex Rattray, founder and CEO of Stainless, noted that Anthropic was among the first teams to support the platform. “I started Stainless because SDKs deserve as much care as the APIs they wrap,” Rattray said. “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 acquisition follows Anthropic’s creation of the Model Context Protocol to facilitate agent connectivity. By integrating the Stainless team, the company aims to push the frontier of developer experience, ensuring that the tools built for the Claude platform are fast, reliable, and native to their respective languages.
Specific financial terms of the deal were not disclosed. The source material also referenced a separate initiative involving PwC rolling out Claude Code and Cowork, but this appears to be a distinct announcement included in the same release and is not part of the core narrative regarding the Stainless acquisition.
