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Building Effective Agents with Pydantic AI

Code examples for the agentic AI patterns discussed in the excellent article Building Effective Agents by Erik Schluntz and Barry Zhang of Anthropic, inspired, ported and adapted from the code samples by the authors.

The examples rely on Pydantic AI, an agentic AI orchestration library that is particularly well-suited for implementing these patterns with clarity and precision.

These examples complement the original code accompanying the article and hopefully serve a dual purpose, demonstrating both the foundational agentic AI patterns discussed in the article and the use of Pydantic AI.

Notebooks

Setup

  1. Copy dot.env to .env

  2. Fill in the API keys for one or more of your LLM provider(s)

  3. Set AI_MODEL to the model you want to use (see https://ai.pydantic.dev/models/ for supported providers and models)

    For example:

    OPENAI_API_KEY=sk-123456789
AI_MODEL=openai:gpt-4o

    or

    GEMINI_API_KEY=ABC-123_xyz
AI_MODEL=gemini-1.5-pro

    or

    ANTHROPIC_API_KEY=ABC-sk-123456789
AI_MODEL=claude-3-5-sonnet-latest

    You can also omit the AI_MODEL variable, which will result in a random model from all the models you have API keys for being chosen (you can use that to play with different models and compare).

  4. You can optionally set the LOGFIRE_TOKEN variable to instrument Pydantic AI and follow the agent calls with Pydantic Logfire.