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Anthropic acquires Stainless to boost SDK tooling

2026-05-23 · anthropic

Anthropic announced it is acquiring Stainless, the company behind much of the SDK and MCP server generation used around Claude. The deal signals a push to control more of the tooling layer that helps developers and agents connect to APIs reliably.

Key Features or Updates

Stainless has been powering official Anthropic SDK generation since the early days of the API, and it already supports SDKs, CLIs, and MCP servers across multiple languages. Anthropic says the acquisition will extend that developer surface as agents increasingly depend on structured access to tools and data.

Impact on Developers

For teams building on Claude, this should reduce friction in the path from API spec to usable client libraries and connectors. It also suggests Anthropic wants tighter feedback loops between model capabilities, connector design, and the developer experience around agentic workflows.

How to use it

If you build against Claude, keep an eye on SDK and MCP server updates as the integration matures. The practical takeaway is to expect more opinionated, better-aligned tooling around Anthropic’s platform rather than separate third-party layers.

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