FastAPI + LangChain LLM Agent Starter Kit

A complete, production-ready backend template for building AI agents with FastAPI and LangChain.

This starter kit gives you a fully structured, tested, and documented project that you can run locally, extend, and deploy. It includes a working synchronous agent with tool support, OpenAPI documentation, environment configuration, CI setup, and clean project structure.

What’s Included

• Full FastAPI application with automatic OpenAPI docs

• LangChain synchronous agent with tool support

• Health, root, and agent invocation endpoints

• Sample calculator tool

• Configurable .env settings

• Pydantic settings management

• CI pipeline (tests + linting)

• Local development instructions

• Fully structured project ready for production

• Test suite using pytest

• Developer-quality folder structure and code formatting

Who Is This For?

• Developers building AI-powered backend services

• Engineers wanting a clean, professional FastAPI template

• Students learning how to structure real-world AI projects

• Indie builders launching agent workflows or microservices

• Teams that want a reliable boilerplate without vendor lock-in

Example Endpoints

✔ / — Root metadata

✔ /docs — Full interactive Swagger UI

✔ /health — Health check

✔ /agent/invoke — Execute the LLM agent with tools

License

This project is licensed for commercial and personal use. Buyers receive free lifetime updates.

Files Included

• Source code

• Project structure

• .env.example

• Requirements

• Test suite

• README

• Release build (ZIP)