What problem does it solve?
LangChain simplifies the complex work of composing language models, tools, memory, and streaming into reliable agents so developers can build multi-step, tool-enabled AI workflows without reinventing orchestration and integration patterns.
Core Features & Use Cases
- Agent Creation: Unified create_agent interface for composing models, tools, and middleware.
- Model & Provider Integration: Connect OpenAI, Anthropic, Google, Azure, and other providers with configuration and fallback patterns.
- Tools & RAG: Define deterministic tools, runtime tool registration, and retrieval-augmented generation pipelines for knowledge-backed answers.
- Memory & Streaming: Short-term memory management, summarization middleware, and streaming output for real-time user experiences.
- Middleware & Safety: Error handling, logging, human-in-the-loop approvals, and retry/circuit-breaker patterns for production robustness.
- Use Case: Build a customer-support agent that searches knowledge bases, calls external APIs safely, streams partial answers to the UI, and returns validated structured data.
Quick Start
Create a Python agent using LangChain to integrate a weather lookup tool, enable streaming to the client, and produce structured JSON output.