Anthropic announced the acquisition of Stainless, a company founded in 2022 that has generated every official Anthropic SDK since the API launch, according to the company statement at https://www.anthropic.com/news/anthropic-acquires-stainless. "Stainless has shaped how developers experience the Claude API since the start," said Katelyn Lesse, Head of Platform Engineering at Anthropic. The move adds SDK generation tools across TypeScript, Python, Go, Java, Kotlin and other languages plus MCP server connectors.

Stainless founder Alex Rattray stated that Anthropic was an early backer and that the teams will continue work on developer tooling for agent connectivity. Anthropic created MCP specifically to enable agent access to external systems and data. The acquisition integrates the Stainless team directly into Anthropic's platform engineering efforts.

The announcement references related deployments including PwC rollout of Claude Code and Cowork plus a $200 million Gates Foundation partnership, both listed on the same page. No financial terms or timeline details appear in the primary release.