Claude Code CLI Pydantic

A high-performance data validation library that integrates with Claude Code CLI to enforce strict type safety using Python type hints.

Pydantic provides the backbone for structured data exchange in CLI tools like Claude Code by leveraging Rust-based validation logic. It converts untrusted JSON inputs into verified Python objects (v2 models) with sub-millisecond latency. Developers use it to define clear schemas for tool-calling and configuration, ensuring that LLM-generated outputs adhere to exact specifications. By enforcing types at runtime, Pydantic eliminates common parsing errors and provides clear error logs for complex automation workflows.

https://github.com/pydantic/pydantic