More than 276,000 KPMG employees will soon have access to Anthropic’s Claude, following a strategic alliance that expands the AI assistant’s real-world deployment. This move coincides with Anthropic’s acquisition of Stainless, the company that has generated every official Anthropic SDK since the beginning of the Claude API. Founded in 2022, Stainless creates the essential libraries and tools that allow developers and AI agents to connect with and utilize the API. “Agents are only as useful as what they can connect to,” said Katelyn Lesse, Head of Platform Engineering at Anthropic, explaining the acquisition aims to advance Claude’s ability to integrate with data and tools through Anthropic’s Multi-tool Capability Protocol, or MCP.
Stainless SDKs and Tooling Power Anthropic’s Claude API
The ability for artificial intelligence agents to interact with external tools depends on robust software development kits, and Anthropic’s recent acquisition of Stainless highlights the importance of this infrastructure. Since its founding in 2022, Stainless has generated every official Anthropic SDK, creating libraries for languages including TypeScript, Python, Go, and Java, ensuring developers have a fast and reliable interface with the Claude API. This is not merely a technical detail; hundreds of companies currently depend on Stainless-generated SDKs, command-line tools, and MCP servers to integrate Claude into their applications. Alex Rattray, Founder and CEO of Stainless, explained his motivation for joining Anthropic, stating, “I started Stainless because SDKs deserve as much care as the APIs they wrap.” This integration extends beyond the technical realm, as evidenced by KPMG’s simultaneous announcement of integrating Claude across its workforce of over 276,000 employees, a deployment facilitated by Stainless’s prior work. By uniting the Stainless and Anthropic teams, the company aims to further refine developer experience and agent connectivity, solidifying Claude’s position in AI agent technology.
MCP Server Development Advances Agent Connectivity for Claude
Current focus on artificial intelligence extends beyond creating responsive models; the emphasis is shifting toward agents capable of independent action, a capability reliant on robust connectivity to external tools and data sources. Anthropic’s Multi-tool Capability Protocol, or MCP, is central to this ambition, and recent developments demonstrate investment in expanding Claude’s agent functionality. These software development kits, available in languages like TypeScript, Python, and Go, provide the interface between Claude and external systems. Stainless’s expertise in generating SDKs, command-line interfaces, and MCP servers allows developers to seamlessly integrate Claude with diverse APIs, a process powered by Stainless since the beginning of the API.
Stainless has shaped how developers experience the Claude API since the start, and it’s been great to work with them on that.
Katelyn Lesse, Head of Platform Engineering at Anthropic
