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Build, Test, Deploy, Monitor: The Agent Development Lifecycle Explained

LangChain3 October 2026Watch on YouTube

What you'll learn

  • The agent development lifecycle has four phases: build, test, deploy and monitor.
  • Building happens in code with a framework such as Deep Agents.
  • Testing revolves around real inputs and expected outputs.
  • After deployment, monitoring follows with tracing and evals.
  • The cycle helps agent engineers build and improve their agents.

Frequently asked questions

What are the four phases of the agent development lifecycle?
According to Amy and Sean from LangChain, they are building, testing, deploying and monitoring.
What do you build an agent in code with according to the episode?
You build the agent in code with a framework such as Deep Agents.
How is the testing phase described in the episode?
Testing is done with real inputs and expected outputs.
How do you monitor an agent after deployment?
After deployment the agent is monitored with tracing and evals.

Topics

In this video

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Description from the channel

Amy and Sean from LangChain break down the agent development lifecycle, the process agent engineers use to build and improve their agents. It comes down to four phases: build it in code with a framework like Deep Agents, test it with real inputs and expected outputs, deploy it into production, and monitor it with tracing and evals. This is a clip from our full conversation where Amy and Sean answer the most commonly searched questions about AI agents, from the basics like what is an agent, what is RAG, and what is MCP, to harder questions like why agents hallucinate, how to evaluate them, and what LangChain actually does.