> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Prompt Chaining

<img src="https://mintcdn.com/upstash/pBXejvUl5XQn4tWO/img/workflow/agents/diagram/prompt-chain-diagram.png?fit=max&auto=format&n=pBXejvUl5XQn4tWO&q=85&s=9da3927de6a1ad5fb0f98f72cac0cf3e" width="2420" height="558" data-path="img/workflow/agents/diagram/prompt-chain-diagram.png" />

This workflow involves chaining multiple LLM calls, where the output of one agent becomes the input for the next agent.

```ts theme={"system"}
import { serve } from "@upstash/workflow/nextjs";
import { agentWorkflow } from "@upstash/workflow-agents";
import { WikipediaQueryRun } from "@langchain/community/tools/wikipedia_query_run";

export const { POST } = serve(async (context) => {
  const agents = agentWorkflow(context);
  const model = agents.openai('gpt-3.5-turbo');

  const agent1 = agents.agent({
    model,
    name: 'firstAgent',
    maxSteps: 1,
    background: 'You are an agent that lists famous physicists.',
    tools: {}
  });

  const agent2 = agents.agent({
    model,
    name: 'secondAgent',
    // set to 2 as this agent will first request tools
    // and then summarize them:
    maxSteps: 2,
    background:
      'You are an agent that describes the work of' +
      ' the physicists listed in the previous prompt.',
    tools: {
      wikiTool: new WikipediaQueryRun({
        topKResults: 1,
        maxDocContentLength: 500,
      })
    }
  });

  const agent3 = agents.agent({
    model,
    name: 'thirdAgent',
    maxSteps: 1,
    background:
      'You are an agent that summarizes the ' +
      'works of the physicists mentioned previously.',
    tools: {}
  });

  // Chaining agents
  const firstOutput = await agents.task({
    agent: agent1,
    prompt: "List 3 famous physicists."
  }).run();

  const secondOutput = await agents.task({
    agent: agent2,
    prompt: `Describe the work of: ${firstOutput.text}`
  }).run();
  

  const { text } = await agents.task({
    agent: agent3,
    prompt: `Summarize: ${secondOutput.text}`
  }).run();

  console.log(text);
});
```

<img src="https://mintcdn.com/upstash/pBXejvUl5XQn4tWO/img/workflow/agents/logs/logs-chain.png?fit=max&auto=format&n=pBXejvUl5XQn4tWO&q=85&s=3993f6d3eb9278bc17d2e6bbdab8e74f" width="1430" height="852" data-path="img/workflow/agents/logs/logs-chain.png" />

In response to the prompt, our agents generate this response:

```
Albert Einstein was a German physicist known for his theory of relativity and the famous equation E=mc^2. He made significant contributions to quantum mechanics and was awarded the Nobel Prize in Physics in 1921. 

Isaac Newton, an English polymath, was a key figure in the Scientific Revolution and the Enlightenment. He is famous for his laws of motion and universal gravitation, as outlined in his book "Philosophiæ Naturalis Principia Mathematica."

Marie Curie, a Polish-French physicist and chemist, conducted pioneering research on radioactivity and was the first woman to win a Nobel Prize. She is the only person to win Nobel Prizes in two scientific fields and her work has had a lasting impact on physics and chemistry.
```