Easy LangChain Question 49 of 223

What is the difference between an agent and a simple chain?

GenAI / LLM · Speak this in 60–90 seconds · Faridabad & Delhi NCR

Flex — one line

Grid — rows + cols

A simple chain follows a fixed graph of steps.

Why interviewers care about LangChain:

They want a clean

contrast on LangChain, not two memorised paragraphs.

Say what changes for

the developer, then one case where picking wrong hurts.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
A simple chain follows
a fixed graph of steps.
2
An agent lets the
model decide which tool to call, with what arguments, and when to stop.
3
Agents are more flexible
and also more failure-prone.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“An agent lets the model decide which tool to call, with what arguments, and when”

Break into beats

Anagentletsthemodeldecide

Speaking order

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Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

A simple chain follows a fixed graph of steps. An agent lets the model decide which tool to call, with what arguments, and when to stop.