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3 production projects and 3 rule sets built with Pydantic.
Production projects
- LLM Application Framework & Agent Orchestrator AI-agent LangChain The current langchain package is a thin agent-building layer on top of LangGraph, with the older chain-based API kept separately as langchain-classic, and every model provider ships as its own versioned package so integrations can release independently of the core library.
- High-Performance Python Web API Framework Classic FastAPI FastAPI keeps its own dependency surface to Starlette and Pydantic and pushes servers, CLI, templating, forms and settings into an optional 'standard' extra, so a bare install stays minimal while typical apps opt into one bundle instead of assembling it dependency by dependency.
- Financial Data Platform Hybrid OpenBB A Poetry-managed core package with router-based provider extensions keeps roughly thirty data sources independently versioned, while the CLI, FastAPI/Uvicorn REST server, MCP server, and Tauri desktop app all wrap that same core library instead of reimplementing it.
Often used with Pydantic
AGENTS.md rules and agent skills with Pydantic
fastapi-jev-decision-service/AGENTS.mdFastAPI + Jev Decision Service (Python)Python rules for a Jev decision service: FastAPI, the async typesafe-sdk client, a typed question registry, confidence thresholds, decision logs and replay tests. intermediatefastapi-python-postgres/AGENTS.mdFastAPI + Python + PostgreSQL (Async SQLAlchemy & Pydantic v2)Production guidelines for FastAPI, Pydantic v2 validation, Async SQLAlchemy 2.0 (asyncpg), Alembic migrations, and PostgreSQL/Redis. intermediatelanggraph-python-fastapi/AGENTS.mdLangGraph + Python + FastAPI (Agentic AI Workflows)Production architecture for autonomous multi-agent systems, LangGraph cyclic state graphs, Pydantic v2 structured tool calling, and Chroma/Qdrant vector stores. advanced
Questions about Pydantic
How many production projects use Pydantic?
3 verified production projects in the STACK IT FAST directory use Pydantic, each with a full architecture breakdown.
What is Pydantic most often used with?
Across projects in the directory, Pydantic is most commonly paired with Python, LangChain, LangGraph.
Is there an AGENTS.md rule or Claude Code skill for Pydantic?
Yes — FastAPI + Jev Decision Service (Python), FastAPI + Python + PostgreSQL (Async SQLAlchemy & Pydantic v2), LangGraph + Python + FastAPI (Agentic AI Workflows) each include a full AGENTS.md, CLAUDE.md, Cursor .mdc rule set and an installable SKILL.md covering Pydantic.