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

# Catalogue

> Browse the governed datasets in your workspace (i.e., what's available to ask about over MCP), organized by how query-ready they are.

The **Catalogue** is the inventory of governed datasets in your workspace — the same
datasets your AI tools can query over MCP. It's a read-only browse: each dataset is a
card showing its friendly title, the exact technical name (e.g. `silver_sales`), a
one-line description of what it holds, its layer, and how many columns it documents.

## Layers

Every dataset sits in one of four **layers**, describing how far it's been refined from
raw source data toward analysis-ready. The catalogue orders the most query-ready first:

| Layer         | What it is                                                                |
| ------------- | ------------------------------------------------------------------------- |
| **Silver**    | Cleaned and joined — conformed data you can query directly                |
| **Gold**      | Aggregated, analysis-ready tables built for reporting                     |
| **Canonical** | Your mastered records (see [canonical entities](/context-layer/ontology)) |
| **Bronze**    | Raw mirrors of each source, exactly as it arrived                         |

<Note>
  The Catalogue is where you confirm *what's available to ask about*. To see *which
  systems* feed these datasets and how fresh they are, head to
  [Sources](/context-layer/sources).
</Note>