Anthropic acquires Stainless
Anthropic News · 2026-05-18
Anthropic acquires Stainless, the SDK and MCP server generation company that has built every official Claude API SDK since launch, to strengthen Claude's agent connectivity and developer tooling infrastructure.
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Extraction
Topics: anthropicsdk-toolingmodel-context-protocoldeveloper-experienceai-agents
Claims
- Stainless has generated every official Anthropic SDK since the earliest days of the Claude API.
- Hundreds of companies use Stainless to generate SDKs, CLIs, and MCP servers across TypeScript, Python, Go, Java, Kotlin, and other languages.
- Anthropic's strategic rationale is that agents are only as capable as the systems they can connect to, making SDK and MCP tooling critical platform infrastructure.
- The acquisition will allow the combined team to advance Claude's ability to connect to external data sources and tools through better MCP server tooling.
Key quotes
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.
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.
Anthropic created MCP to make agent connectivity possible.