What is Pydantic?
Python's most popular data validation library (200M+ monthly downloads). Infrastructure for AI: define tool schemas, validate structured output, configure agents.
TL;DR: #1 Python data validation (200M+/mo). AI essentials: LLM tool schemas + structured-output validation + agent config. Depended on by all major AI frameworks. V2 is 5–50x faster than V1. 22k+ stars.
Best for: Python developers building AI agents, APIs, or data pipelines.
Pydantic in AI
1. Tool Definition — auto-generated JSON Schema
2. Output Validation — validate structured data returned by LLMs
3. Agent Config — type-safe config files
FAQ
Q: V1 or V2? A: Always V2 — 5–50x faster; the ecosystem has migrated.