prompt-ninja is a Python library that treats LLM prompts as version-controlled software artifacts. It enables developers to version, validate, and run regression tests on prompts, integrating with tools like OpenRouter. Ideal for teams building reliable LLM-powered applications that require reproducible and testable prompt engineering workflows.
prompt-ninja is an AI & ML product. It focuses on treating LLM prompts as unversioned text that cannot be reliably tested or iterated on like traditional software. prompt-ninja is an open-source project aimed at developers. The project is open source (MIT). prompt-ninja is available on the command line.
haami-com builds and maintains prompt-ninja, and the product first shipped in 2026. Among its 4 catalogued features are Prompt Versioning, Prompt Validation, and Regression Testing. It exposes integrations via a public API.
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