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An SDK generator is a particular program application designed to generate full and ready-to-use Software Development Kits (SDKs) or client libraries from API definitions, often in the form of OpenAPI/Swagger definitions. These tools dynamically generate idiomatic and type-safe code, rather than requiring the developer to write hundreds of lines of code in many languages for HTTP requests, authentication, error handling, etc.

Some common tools that are available include Speakeasy, Fern, Stainless (not so long ago acquired by Anthropic), Postman SDK Generator, and APIMatic. They can be used in various languages such as TypeScript, Python, Java, Go, C++, and others.

The vast array of AI APIs and agentic tools, especially in the era of AI, has made SDK generators highly desirable. There is a growing need for high-quality SDKs that can be quickly developed by companies to encourage the adoption of new LLM models, AI agents, and vector databases. Newcomers to the space—including companies launching new models, AI agents, and vector databases—require a high-quality SDK to pave a path toward greater adoption. It would take a significant amount of time to manage SDKs by hand in each language. In the fast-paced world of AI, where updates occur on a weekly basis, consistency is key, as are quicker updates when APIs evolve and improved developer experience. AI startups and enterprises are able to speed up their integrations while easing support onslaught, thanks to this automation.