# useAssistantInstructions
URL: /docs/copilots/use-assistant-instructions

React hook for setting system instructions to guide assistant behavior.

`useAssistantInstructions` is a React hook that allows you to set system instructions for your assistant-ui components.

Usage \[#usage]

```tsx
import { useAssistantInstructions } from "@assistant-ui/react";

function MyComponent() {
  // Simple string usage
  useAssistantInstructions("You are a helpful form assistant...");

  // With configuration object
  useAssistantInstructions({
    instruction: "You are a helpful form assistant...",
    disabled: false, // Optional: disable the instructions
  });

  return <div>My Component</div>;
}
```

API Reference \[#api-reference]

Parameters \[#parameters]

The hook accepts either:

* A string containing the system instructions
* A configuration object with:
  * `instruction`: The system instructions
  * `disabled`: Optional boolean to disable the instructions

Behavior \[#behavior]

The hook will:

1. Register the provided instructions as system instructions in the model context
2. Automatically clean up when the component unmounts
3. Update when the instructions change
4. Do nothing if disabled is set to true

Example \[#example]

```tsx
function SmartForm() {
  useAssistantInstructions({
    instruction: `
      You are a form assistant that:
      - Validates user input
      - Provides helpful suggestions
      - Explains any errors
      - Guides users through complex fields
    `,
  });

  return <form>{/* Your form fields here */}</form>;
}
```