#23 · Primary category： Prompt Engineering Tools
ell
A language model programming library.
Project last updated：06/05/25
GitHub Stars
5.9K
Forks
341
Contributors
46
License
MIT
Why we included this project
ell treats prompts as code rather than strings scattered through your project. Each language model call is a decorated Python function, a language model program, with system and user messages written inline so they sit next to the logic that uses them. The framework borrows a trick from training checkpoints: every run automatically serializes and versions the prompt, complete with generated commit messages, so you can trace which edit changed the output. A local companion tool, Ell Studio, handles prompt versioning, monitoring, and visualization, which makes it easier to spot regressions before they ship. For teams juggling complex or shared prompts, that turns prompt engineering from guesswork into something you can track and review like normal code.
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