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

# What are Assistants?

> Reusable AI personas with custom instructions

Assistants in BlackMountain are reusable AI personas that you configure with custom instructions, a default model, and metadata. When you start a chat with an assistant, the system prompt you defined shapes every response.

## Why Use Assistants?

Instead of repeating the same instructions at the start of every conversation, create an assistant once and reuse it:

* **Research assistant** -- Configured to provide thorough, cited research
* **Support agent** -- Trained to respond in your company's tone and style
* **Code reviewer** -- Set up with your coding standards and review checklist
* **Writing editor** -- Customised with your preferred writing style and guidelines

## How Assistants Differ from Regular Chats

| Feature       | Regular Chat                   | Assistant Chat                   |
| ------------- | ------------------------------ | -------------------------------- |
| System prompt | None (default model behaviour) | Custom instructions you define   |
| Default model | Your global default            | Model selected for the assistant |
| Reusability   | One-off conversation           | Reusable persona                 |
| Organisation  | Manual                         | Labelled and categorised         |

## Getting Started

<CardGroup cols={2}>
  <Card icon="plus" href="/assistants/creating-assistants" title="Create an Assistant">
    Set up your first custom AI persona.
  </Card>

  <Card icon="play" href="/assistants/using-assistants" title="Use an Assistant">
    Start a conversation with an assistant.
  </Card>
</CardGroup>