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

# list_public_brains

> List the public brains available to query. Returns metadata only.

Lists the public [brains](/brains/overview) you can query: graph-based knowledge bases such as indexed library and framework documentation. Returns metadata only, no content. Use this first to find the right brain before searching it with [query\_brain](/mcp/tools/query-brain).

## Input

| Parameter | Type   | Required | Description                                 |
| --------- | ------ | -------- | ------------------------------------------- |
| `limit`   | number | No       | Max results to return. Default 50, max 100. |

## Example

**Prompt:**

> *"What public brains can I query?"*

**Tool call:**

```json theme={null}
{}
```

**Response:**

```
1 public brain available:

- Name: Supabase Docs
- ID: fa8d5392-fc77-4eb4-8a4c-64e0005c56b6
- Source: https://supabase.com/docs/
- Description: Brain for entire `supabase/docs/`
- Overview: Supabase is a PostgreSQL database as a service that provides additional features such as authentication and file storage. It is designed to simplify the process of building serverless applications. The platform offers a range of features including real-time data synchronization, scalable storage, and secure authentication. It also provides guides and tutorials for getting started with Supabase, including quickstart guides and step-by-step tutorials for popular frameworks. Supabase also offers a range of integrations with third-party services, including Vercel and AWS Marketplace. The platform is designed to be flexible and scalable, making it suitable for a wide range of applications and use cases.
- Tokens: 1516775
- Nodes: 28201
- Last updated: 2026-06-08
```

Each entry includes the brain ID you pass to the other brain tools. Fields that aren't set (source, tokens, pages) are omitted.

## When to use it

* The agent needs context about a library or topic and you want it to pick the right brain first.
* You want to see what knowledge bases are available before querying.
* You have a brain ID from a previous result and want to confirm its details.

## See also

* [query\_brain](/mcp/tools/query-brain): search a brain for relevant passages.
* [get\_brain\_tree](/mcp/tools/get-brain-tree): see how a brain is organized.
* [Brains overview](/brains/overview): how brains are structured.