Anthropic Acquires Stainless, the SDK and MCP Server Platform Behind Its API

Anthropic has acquired Stainless, the SDK generation and MCP server platform that has powered every Anthropic SDK since the earliest days of the API. Stainless will continue operating as Anthropic's SDK and MCP server platform post-acquisition.

1 min read|agenticonsult Intelligence

Anthropic Acquires Stainless, the SDK and MCP Server Platform Behind Its API

Anthropic has acquired Stainless, the SDK generation and MCP server platform that has underpinned every Anthropic SDK since the API's earliest public release. The acquisition was announced by both companies simultaneously. Stainless will continue to operate as Anthropic's SDK and MCP server platform going forward, with its existing SDK generation pipeline intact.

Why It Matters

Bringing Stainless in-house gives Anthropic direct control over the toolchain layer that third-party developers use to build on the Claude API. For teams using LlamaIndex or other frameworks that relied on Stainless for SDK generation, this signals that Anthropic now owns the full developer-surface stack from API to SDK to MCP server scaffolding.

Primary source

Anthropic

#anthropic #mcp #acquisition

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