Anthropic has acquired developer tooling startup Stainless as the company pushes deeper into infrastructure for AI agents capable of interacting with external tools, APIs, and enterprise systems.
Founded in 2022, Stainless develops software that automatically generates SDKs, command-line tools, and MCP servers from API specifications. The company has already played a central role in Anthropic’s developer ecosystem, powering every official Anthropic SDK since the early days of the Claude API.
Anthropic said the acquisition is intended to improve how developers and AI agents connect Claude to external data sources, applications, and workflows. The company described agent connectivity as a critical next step in AI development as the industry shifts from chatbot-style systems toward autonomous agents capable of taking actions across software environments.
Stainless currently supports SDK generation across multiple programming languages including TypeScript, Python, Go, Java, and Kotlin. The platform is used by hundreds of companies to create developer tooling that allows applications and AI systems to interact reliably with APIs and services.
Anthropic said Stainless will help strengthen the Claude Platform’s developer experience and expand support for Model Context Protocol, or MCP, the open standard Anthropic introduced to simplify connections between AI systems and external tools.
AI Agents Need Access to External Systems
The acquisition reflects a broader shift across the AI industry as companies move beyond standalone models toward agentic systems that can perform actions inside real software environments.
While earlier AI assistants focused primarily on answering questions or generating text, newer AI agents increasingly rely on APIs, plugins, databases, productivity software, and enterprise infrastructure to complete tasks autonomously. That makes developer tooling and integration layers strategically important for AI companies competing to build broader ecosystems around their models.
Anthropic said SDKs, CLIs, and MCP servers are becoming foundational infrastructure for enabling AI agents to interact safely and reliably with external systems.
The company has been steadily expanding its focus on developer tooling and enterprise integrations through products such as Claude Code, Claude Cowork, and MCP. Anthropic recently partnered with consulting firms including PwC and KPMG to embed Claude into enterprise workflows, financial systems, and operational platforms.
