WEBVTT

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The react agent pattern has undergone significant evolution since it was introduced in LinkedIn back

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in November of 2022, and initially, the Lang chain react agent relied purely on react prompting,

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where the model would reason about the actions and observations in a text based format.

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And as the LM landscape evolved with the native function calling feature capabilities of large language

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models, this architecture transitioned into tool calling agents, which leveraged the structured function

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calling instead of prompt based tool selection.

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And this made tool execution more reliable and more efficient.

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Now the next major leap came with the react agent, which maintained function calling but rebuilt the

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agent on top of the graph's low level orchestration framework, providing with durable execution, persistence

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ability and fine grained control needed for production grade applications.

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Replications, and in the long chain version 1.0 linked Chain introduced the create agent function,

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which provides a clean, high level interface while being powered with the battle tested Landgraf React

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agent under the hood, and in this course, we'll walk through each one of these agent iterations.

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Hands on.

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Starting from the latest and greatest create agent function.

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Moving back to the original OG react implementation in progressively build up towards the modern V1

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agent architecture.

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So you can understand not just how to use these agents, but how they actually work underneath the hood,

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what each iteration improved and it will give you a very strong intuition when implementing production

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grade agents.

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Now, I know I mentioned tool calling and Landgraf and we haven't really discussed any of this.

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We'll have plenty of time to do that.

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And we'll be diving very, very deep into each one of those iterations and into each one of those agents

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and each one of those topics like tool calling, like line graph.

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And the only thing you need to remember from this video is that we're going to be iterating through

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agent implementations until we get to a final agent implementation, which is robust and production

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ready.

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We're going to be starting with the latest create agent function.

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And in this section we are going to learn how to use this function and how to create modern link chain

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agents.

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And now because learning about agents can be a bit overwhelming.

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So what I decided to do is teach you in this section just the interface.

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So how to create and how to get started really, really quick.

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And in the sections afterward, we're going to be diving one layer deeper and understand how those agents

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originated.

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What is this magic of agents, how it's happening under the hood?

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A lot of very cool and important things that every engineer must know.

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And I promise you, it's going to be very cool.