Agents vs. chains vs. tools

Hello, I have a theoretical question. I don’t quite understand what the difference is between using an agent or several chains. Chains contain LLM, so what function do agents have that is different from the concatenation of several chains? If an agent can use tools, what is the difference between these tools and chains, can I use chains in an agent?
Thank you very much in advance!

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  • Agents are like characters or personas with specific capabilities. They use chains and tools to perform their functions.
  • Chains are sequences of processing steps for prompts. They are used within agents to define how the agent processes information.
  • Tools are specialized functionalities that can be used by agents or within chains for specific tasks.

But… I thought that it was possible to create a dialogue system just by concatenating chains. I mean, in Langchain you can use sequential chains, router chains, etc. (where the output of a chain is the input of the next one) without using agents, right?
Thank you so much for answering! :slight_smile:

i think agents make your application smart where based on the prompt it will utilize the tools provided and return a response.

chains are not smart unless you do a RAG on it.