The open-source Stainless — point your existing stainless.yml at it and get the same idiomatic Python SDK. Zero migration. No SaaS.
stainful is an open-source tool that transforms an API description and a configuration file into a complete, production-ready Python client library. It generates typed models, auto-pagination, named error classes, retry logic, and streaming support — everything a polished SDK needs. The output looks like it was hand-written by a Python expert, and it works identically to the commercial alternative but runs entirely on your own machine without any account or hosted service.
How It Works
You heard about a commercial tool that creates Python client libraries, but found stainful instead — the same results, completely free and running on your own computer.
You gather two files: an OpenAPI spec that describes your API, and a configuration file that tells stainful how you want your client library organized.
With a single instruction, stainful reads your files and generates a complete, production-ready Python SDK — models, error classes, pagination, everything.
The generated SDK includes clean class names, typed data models, auto-pagination helpers, and proper error handling — all organized the way you'd write it yourself.
Simple, straightforward calls that wait for responses.
Non-blocking calls that handle many requests at once.
Instead of guessing at response shapes or checking status codes, you get autocomplete, type hints, and named exceptions like 'RateLimitError' that catch themselves.
Retries happen automatically, pagination flows naturally, and your code reads like it was written by someone who really understands Python — because the SDK thinks like a Python developer.
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