Code execution is a new technique to power MCP tools through LLM-generated code. Stainless has observed that a technique we call "SDK code mode" provides state-of-the-art performance and accuracy for MCP tools that expose an API. Learn how SDK code mode works, and check out our eval results in this post.

In this post, we examine the reasons you might consider building an SDK for your product. SDKs speed developer adoption, reduce support burden, unlock enterprise customers, and help LLMs use your API more effectively.

Handling multiple resource variants in a REST API can be a tricky design challenge, with many considerations and trade-offs to take into account. In this post, we’ll look at an AI image generation API as an example, but the concepts we’re going to discuss are broadly applicable to any API with multiple resource variants.

When your job is building SDKs, a dependency manager that defies everyone’s expectations can wreak havoc, and working around third-party behavior can be tricky. Learn how and why we rejected a quick fix and took the time to develop a robust solution that meets our high quality bar.

Despite the hype, Model Context Protocol (MCP) isn’t magic or revolutionary. But, it’s simple, well-timed, and well-executed. At Stainless, we’re betting it’s here to stay.

How we handled $refs, client quirks, recursive schemas, and tool selection in a clean, extensible way.

Ensure forwards compatibility in Java SDKs by wrapping enums with a fallback _UNKNOWN case.

How to preserve source and binary compatibility for nullable fields in Java.