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

# Brains

> Brains hold the facts, notes and documents your AI assistant should know. Keep them in SprintBrain and add them to an AI chat when a task needs them.

A Brain is a collection of what your AI assistant should know about your work: facts, notes, documents and saved conversations. You keep it in SprintBrain, and add the relevant parts to a chat in ChatGPT, Claude or another assistant when you need them.

## Create a Brain

<Steps>
  <Step title="Open Brains">
    In the dashboard sidebar, click **Brains**.
  </Step>

  <Step title="Click New Brain">
    Give it a name, like `Product reference`, and a line on what belongs in it. Use the words its items will use: SprintBrain reads them to suggest this Brain when you save something.
  </Step>

  <Step title="Click Create Brain">
    It opens, ready for its first item.
  </Step>
</Steps>

One Brain is your default. It can't be moved to the trash.

## Fill a Brain

* **Add text**: write a fact, a note or a conversation. Give it a name, a one-line **Summary** and the **Body**. The editor shows how long it is in tokens, the unit AI assistants measure text in. **Draft from text** at the top of the editor names and summarises text you paste. See [Draft with AI](/draft/overview).
* **Upload file**: PDF, Word (`.docx`), text (`.txt`, `.md`) or CSV files up to 20 MB. SprintBrain reads the text and splits it into pieces your assistant can use.
* **Always attached**: switch this on for items that should go into every context you add, like your house style.

Keep each fact to a single idea. Short, separate items fit into a chat more easily than one long one.

Each item keeps its earlier versions: open it and click **History** to see them and restore one.

## Review status

Each item has a review status, like snippets and prompts. Items an AI assistant saves into your Brains are marked **AI generated** until you approve them. A deprecated item still works, and the Context button marks it before you add it to a chat. An archived item is never added to a chat. See [Review and approval](/review/overview).

## Use a Brain in an AI chat

On ChatGPT, Claude, Gemini, Grok, Perplexity, DeepSeek and Copilot, the extension adds a **Context** button next to the message box.

1. Start writing your message.
2. Click **Context**, or press <kbd>Ctrl</kbd> <kbd>Shift</kbd> <kbd>M</kbd> (<kbd>Cmd</kbd> <kbd>Shift</kbd> <kbd>M</kbd> on a Mac).
3. SprintBrain picks the items that match what you're writing and puts them above your message as normal text.

You see exactly what will be sent, and you can edit or delete any of it before you send.

### On your phone

On the [phone page](/apps/mobile#brains), tap **Brains**, open a Brain and tap **Copy whole Brain**. Paste it into the AI app at the start of your message. You can also copy or share a single item.

## Save things into a Brain

* **Selected text on any page**: highlight it, right-click and choose **Save selection to SprintBrain**. Pick a Brain and click **Save**.
* **A whole AI conversation**: on a ChatGPT or Claude conversation, open the SprintBrain popup. A **Save this chat** card appears. Pick a Brain and click **Save**.
* **From your phone**: share text or a link from any app to SprintBrain, or copy it and tap **Paste & save**. See [Save from other apps](/apps/mobile#save-from-other-apps). To write an item yourself, open a Brain on the [phone page](/apps/mobile#brains) and tap **Add text**.

Each of these suggests the Brain that fits best: the one whose name, description and items share the most words with what you're saving. A line under the Brain list says why, or that no Brain fits yet, in which case the Brain you used last stays selected. You can always pick another. A Brain's description helps here: list the words its items use.

## Trash

Items, files and whole Brains go to the trash first. Open **Trash** to restore them, or delete them for good. Deleting a Brain for good removes everything in it, files included.

<Note>
  You manage Brains in the dashboard. The phone page reads, copies and adds to them; creating, renaming and deleting Brains, editing items and uploading files happen on a computer.
</Note>


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