Environment Variables

Required keys for AI features. Add per app in Getting Started → Environment Variables, or keep this page as the AI-specific reference.

LangGraph Platform (hosted graphs)

Variable	Required	Purpose
LANG_GRAPH_URL	Yes	LangGraph Platform API base
LANG_GRAPH_API_KEY	Yes	SDK authentication
LANG_GRAPH_BACKEND_TOKEN	Yes	Bearer token on SDK default headers
WEBHOOK_PUBLIC_BASE_URL	Prod / local tunnel	Public origin for webhook callbacks

LLM and embeddings

Variable	Required	Purpose
OPENAI_API_KEY	Yes	In-process agents and embeddings fallback
USE_AZURE_OPENAI	Optional	Switch to Azure
AZURE_EMBEDDINGS_*	If Azure	Embedding deployment

Observability

Variable	Required	Purpose
LANGSMITH_PROJECT	Optional	LangSmith project on graph host

See also

• Integration flow
• Local development
• Integrations Overview → OpenAI, Azure OpenAI, LangSmith

Official documentation

• LangGraph Platform env
• OpenAI API keys
• Azure OpenAI