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Deep Agents · Interface

AgentCheckpointer

A LangChain agent is a model that calls tools in a loop until a task is complete. In JavaScript, createAgent builds the configurable harness around that loop.

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Syntax

createAgent({ model, tools })

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • harness
  • model
  • tools
  • middleware

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