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

# Key Concepts

> Facets, assets, and the three asset types

This page introduces the core concepts behind Facets. For normative requirements, see the [Specification](/specification).

## Facets

A **facet** is a versioned collection of [assets](#assets) defined by a [facet manifest](/specification/manifest) (`facet.json`) — the same bundle an author creates locally, publishes to the registry, and installs into a project.

## Assets

An asset is a discrete unit of content within a facet. A facet bundles any combination of the three text asset types below. Skills follow the [Agent Skills](https://agentskills.io/specification) specification; agents and commands are single-file conventions defined by the [facet specification](/specification).

<Columns cols={3}>
  <Card title="Skills" href="/docs/learn/skills">
    Reusable knowledge and guidelines the assistant applies passively.
  </Card>

  <Card title="Commands" href="/docs/learn/commands">
    User-invokable workflows, exposed as slash commands.
  </Card>

  <Card title="Agents" href="/docs/learn/agents">
    Personas with a defined role, behavior, and tool access.
  </Card>
</Columns>