Marvin AI

Python toolkit for building reliable AI-powered functions and pipelines

Code & DevelopmentFree

Marvin is an open-source Python toolkit by Prefect that makes it easy to add AI capabilities to existing applications by decorating standard Python functions with AI behaviors. Developers use simple decorators to turn functions into LLM-powered classifiers, extractors, and generators — with type-safe outputs guaranteed by Pydantic models. Marvin focuses on reliability and predictability, making AI functions behave like well-tested code rather than unpredictable prompts.

Key Features

• ✓Python decorators
• ✓Type-safe AI
• ✓Classification
• ✓Entity extraction
• ✓Text transformation
• ✓Pydantic integration