LangChain – AI Agent Framework

LangChain is the foundational framework for building AI agents with tool integration, memory, chain-of-thought reasoning, and RAG.

• GitHub: github.com/langchain-ai/langchain (112 000+ ⭐)
• License: MIT
• Security: Sequoia-backed. Active security team. No malware.

Environment Variables

Variable	Description
{{LANGSERVE_URL}}	Base URL of a LangServe deployment

Usage Examples

Invoke a LangServe chain

curl -s -X POST "{{LANGSERVE_URL}}/invoke" \
  -H "Content-Type: application/json" \
  -d '{"input": {"question": "Summarise this document"}}'

Stream responses

curl -s -X POST "{{LANGSERVE_URL}}/stream" \
  -H "Content-Type: application/json" \
  -d '{"input": {"question": "Explain quantum computing"}}'

AI Agent Tips

• LangServe exposes LangChain chains as REST APIs.
• Use LangGraph for complex stateful agent orchestration.
• Supports 100+ LLM providers, vector stores, and tool integrations.
• LCEL (LangChain Expression Language) enables composable chain building.