# Deep Agent Search

This project demonstrates a simple search agent built with **LangChain**'s `DeepAgent` and the **OpenAI** language model. The agent can answer user queries and perform web searches when needed.

## Prerequisites

- Node.js 18+ (ES modules support)
- An OpenAI API key. Set it in your environment:

```bash
export OPENAI_API_KEY="your-api-key-here"
```

## Installation

```bash
npm install
```

## Usage

### CLI

Run the agent interactively:

```bash
npm start
```

You will be prompted to enter a question. The agent will respond.

### Programmatic

```js
import { ask } from "./src/index.js";

async function main() {
  const answer = await ask("Who wrote 'Pride and Prejudice'?");
  console.log(answer);
}

main();
```

## Testing

A simple test script is provided:

```bash
npm test
```

It queries the agent with a sample question and prints the answer.

## Project Structure

- `src/agent.js` – Configures the `DeepAgent` with OpenAI LLM and the search tool.
- `src/index.js` – Exposes the `ask` function and a CLI demo.
- `test.js` – Quick test script.
- `package.json` – Project metadata and dependencies.

## Dependencies

- `langchain` – Core LangChain library.
- `langchain-openai` – OpenAI wrapper for LangChain.
- `langchain-community` – Community tools, including the web search tool.

## License

MIT