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AI Agents · Concept

Planning

An agent is a model that calls tools in a loop until a task is complete. A harness surrounds that loop with prompts, tools, and middleware; use create_agent for a smaller configurable harness, or Deep Agents for complex long-running work.

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Syntax

create_agent(model, tools, system_prompt=None, middleware=None)

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  • LangGraph
  • Deep Agents
  • create_agent
  • create_deep_agent
  • middleware
  • subagents
  • TodoListMiddleware
  • LangSmith Deployment

Source: Agents - Docs by LangChain Documentation. Checked 2026-11-03.