---
title: "Anthropic acquires Stainless"
description: "Anthropic is acquiring Stainless, an SDK and MCP server tooling company founded in 2022, to expand how Claude and other agents connect to data and tools. Stainless has generated every official Anthropic SDK since the API’s early days and is used by hundreds of companies to produce SDKs, CLIs, and MCP servers from API specifications. Its tooling supports TypeScript, Python, Go, Java, and other languages, with libraries designed to feel native while remaining fast and reliable. The companies say combining their teams will advance developer experience and agent connectivity on the Claude Platform, while Stainless’s founder, Alex Rattray, said the team will continue its work within Anthropic."
---

# Anthropic acquires Stainless

[Anthropic](https://yomu.fyi/company/anthropic) · Sep 9, 2026

**Type:** Announcement

## Summary

Anthropic is acquiring Stainless, an SDK and MCP server tooling company founded in 2022, to expand how Claude and other agents connect to data and tools. Stainless has generated every official Anthropic SDK since the API’s early days and is used by hundreds of companies to produce SDKs, CLIs, and MCP servers from API specifications. Its tooling supports TypeScript, Python, Go, Java, and other languages, with libraries designed to feel native while remaining fast and reliable. The companies say combining their teams will advance developer experience and agent connectivity on the Claude Platform, while Stainless’s founder, Alex Rattray, said the team will continue its work within Anthropic.

## Context

Anthropic says agents are only as capable as the systems they can reach, motivating the acquisition to extend Claude’s connections to data and tools.

## Approach / What changed

Anthropic is bringing Stainless’s team and SDK, CLI, and MCP server generation capabilities into the Claude Platform. Stainless converts API specifications into language-specific SDKs and related tooling.

## Takeaways

- Stainless has generated every official Anthropic SDK since the earliest days of Anthropic’s API.
- Stainless generates SDKs across TypeScript, Python, Go, Java, and other languages, along with CLIs and MCP servers.
- The companies say the combined team will advance developer experience and agent connectivity for Claude.

**Tags:** [API](https://yomu.fyi/topic/api), [Developer Experience](https://yomu.fyi/topic/developer-experience), [MCP](https://yomu.fyi/topic/mcp)

- Source: [Anthropic](https://www.anthropic.com/news/anthropic-acquires-stainless)
- Source URL: https://www.anthropic.com/news/anthropic-acquires-stainless
- Ingested by Yomu: 2026-09-09T16:01:39.601Z

[Read original post](https://www.anthropic.com/news/anthropic-acquires-stainless)