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

# Role • Rust AI Agent SDK

> Role: Message role in a conversation

# Role

> Defined in the [**LLM**](../modules/llm) module.

<Badge color="orange">Rust AI Agent SDK</Badge>

Message role in a conversation

## Fields

| Name        | Type      | Description                   |
| ----------- | --------- | ----------------------------- |
| `System`    | `variant` | -                             |
| `message`   | `variant` | -                             |
| `System`    | `variant` | System message (instructions) |
| `User`      | `variant` | -                             |
| `message`   | `variant` | -                             |
| `User`      | `variant` | User message                  |
| `Assistant` | `variant` | -                             |
| `message`   | `variant` | -                             |
| `Assistant` | `variant` | Assistant message             |
| `Tool`      | `variant` | -                             |
| `function`  | `variant` | -                             |
| `result`    | `variant` | -                             |
| `Tool`      | `variant` | Tool/function result          |

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-rust/praisonai/src/llm/mod.rs">
  `praisonai/src/llm/mod.rs` at line 0
</Card>