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---
title: "System Prompt"
description: "Customize the system prompt to control agent behavior and capabilities"
icon: "message"
---
## Overview
You can customize the system prompt in two ways:
1. Extend the default system prompt with additional instructions
2. Override the default system prompt entirely
<Note>
Custom system prompts allow you to modify the agent's behavior at a
fundamental level. Use this feature carefully as it can significantly impact
the agent's performance and reliability.
</Note>
### Extend System Prompt (recommended)
To add additional instructions to the default system prompt:
```python
from browser_use import Agent
from langchain_openai import ChatOpenAI
# Add your custom instructions
extend_system_message = """
REMEMBER the most important RULE:
ALWAYS open first a new tab and go first to url wikipedia.com no matter the task!!!
"""
# Create agent with extended system prompt
agent = Agent(
task="Your task here",
llm=ChatOpenAI(model='gpt-4'),
extend_system_message=extend_system_message
)
```
### Override System Prompt
<Warning>
Not recommended! If you must override the [default system
prompt](https://github.com/browser-use/browser-use/blob/main/browser_use/agent/system_prompt.md),
make sure to test the agent yourself.
</Warning>
Anyway, to override the default system prompt:
```python
# Define your complete custom prompt
override_system_message = """
You are an AI agent that helps users with web browsing tasks.
[Your complete custom instructions here...]
"""
# Create agent with custom system prompt
agent = Agent(
task="Your task here",
llm=ChatOpenAI(model='gpt-4'),
override_system_message=override_system_message
)
```
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