Anthropic
@AnthropicAI
Anthropic is acquiring @stainlessapi, an SDK and MCP server platform that has powered every Anthropic SDK since the earliest days of our API. Read more: https://t.co/ZQbsZKnicv
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View on XAnthropic Acquires Stainless to Scale Agent Connectivity Through Native SDKs
Anthropic is acquiring Stainless, a platform that generates software development kits (SDKs — libraries for interacting with an API) and servers for Anthropic's MCP production framework. Stainless converts API specifications into language-native code and has powered Anthropic's official SDKs since the earliest days of its API.
The acquisition signals a shift toward the agentic paradigm, where AI utility depends on the ability to act within external systems. By bringing Stainless in-house, Anthropic secures the "factory" that builds the connectors required for Claude Agent SDK usage. This ensures Claude remains deeply integrated across diverse programming environments.
For organizations building on the Claude Platform, this integration promises more robust tools for connecting agents to proprietary data. Stainless will continue supporting existing customers while advancing Anthropic's goal of making agents more capable of multi-step actions. The team joins Anthropic's platform engineering division immediately.
Still wondering? A few quick answers below.
Stainless is a specialized platform that generates software development kits and Model Context Protocol servers by converting API specifications into high-quality code. Anthropic acquired the company to vertically integrate its developer tools, ensuring that Claude has reliable, language-native connectors to interact with external data and software systems as the industry shifts toward autonomous agents.
Stainless generates native libraries across a wide range of popular programming languages, including TypeScript, Python, Go, Java, and Kotlin. By supporting these diverse environments, the platform ensures that developers can integrate Claude into their existing tech stacks using tools that feel native to their specific language, rather than relying on generic or manual API wrappers.
The acquisition strengthens the Model Context Protocol, which is an open standard Anthropic created to help AI models connect to external tools. By bringing the Stainless team in-house, Anthropic can more effectively build the connectors and servers that allow AI agents to move beyond simple chat responses and perform multi-step actions across different software applications and databases.
Yes, Stainless will continue to support the hundreds of companies that currently rely on its platform to generate their own SDKs, command-line tools, and connectors. While the team is joining Anthropic to focus on the Claude Platform, the acquisition is designed to advance the broader ecosystem of agent connectivity that many developers and businesses already use.
Stainless has a long-standing relationship with Anthropic, having powered the generation of every official Anthropic SDK since the earliest days of the Claude API. The two companies have worked closely together for years to shape the developer experience, making the decision to join forces a natural evolution of their existing technical partnership and shared goals.
