Automated Prompt Optimization with GEPA, Pydantic AI, and Pydantic Evals

Prompt engineering, crucial for optimizing large language model applications, often involves a time-consuming and inconsistent manual process of iteratively refining prompts to achieve desired outputs. GEPA (Genetic-Pareto Prompt Evolution) automates this process by applying evolutionary algorithms to improve prompts based on set success criteria and evaluation feedback. Integrated with Pydantic AI, GEPA uses Agent.override() to inject candidate prompts during optimization without altering agent definitions, while Pydantic Evals provides a robust evaluation harness with parallel execution, rich metrics, and OpenTelemetry tracing. The approach systematically explores prompt variations, allowing algorithms to optimize prompts across multiple modules through genetic crossover and intelligent mutations proposed by LLMs, ultimately transforming prompt optimization from an art into a science. This methodology is demonstrated through a case study on extracting contact information from unstructured text, highlighting the benefits of automation, efficiency, and fresh perspectives in prompt engineering.

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