deepagent_quickstart.md

Quickstart

Build your first deep agent in minutes

This guide walks you through creating your first deep agent with planning, file system tools, and subagent capabilities. You'll build a research agent that can conduct research and write reports.

Prerequisites

Before you begin, make sure you have an API key from a model provider (e.g., Anthropic, OpenAI).

Step 1: Install dependencies

```bash pip theme={null} pip install deepagents tavily-python ```

uv add deepagents tavily-python

poetry add deepagents tavily-python

Step 2: Set up your API keys

export ANTHROPIC_API_KEY="your-api-key"
export TAVILY_API_KEY="your-tavily-api-key"

Step 3: Create a search tool

import os
from typing import Literal
from tavily import TavilyClient
from deepagents import create_deep_agent

tavily_client = TavilyClient(api_key=os.environ["TAVILY_API_KEY"])

def internet_search(
    query: str,
    max_results: int = 5,
    topic: Literal["general", "news", "finance"] = "general",
    include_raw_content: bool = False,
):
    """Run a web search"""
    return tavily_client.search(
        query,
        max_results=max_results,
        include_raw_content=include_raw_content,
        topic=topic,
    )

Step 4: Create a deep agent

# System prompt to steer the agent to be an expert researcher
research_instructions = """You are an expert researcher. Your job is to conduct thorough research and then write a polished report.

You have access to an internet search tool as your primary means of gathering information.

## `internet_search`

Use this to run an internet search for a given query. You can specify the max number of results to return, the topic, and whether raw content should be included.
"""

agent = create_deep_agent(
    tools=[internet_search],
    system_prompt=research_instructions
)

Step 5: Run the agent

result = agent.invoke({"messages": [{"role": "user", "content": "What is langgraph?"}]})

# Print the agent's response
print(result["messages"][-1].content)

What happened?

Your deep agent automatically:

1. Planned its approach: Used the built-in write_todos tool to break down the research task
2. Conducted research: Called the internet_search tool to gather information
3. Managed context: Used file system tools (write_file, read_file) to offload large search results
4. Spawned subagents (if needed): Delegated complex subtasks to specialized subagents
5. Synthesized a report: Compiled findings into a coherent response

Next steps

Now that you've built your first deep agent:

• Customize your agent: Learn about customization options, including custom system prompts, tools, and subagents.
• Understand middleware: Dive into the middleware architecture that powers deep agents.
• Add long-term memory: Enable persistent memory across conversations.
• Deploy to production: Learn about deployment options for LangGraph applications.

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