# How packs work
Once you know what comes in the built-in packs, use these pages to understand the underlying architecture: how source files become importable archives, how `.agent.yaml` definitions bind agents to behavior, and how annotated Markdown becomes reusable capabilities and prompts.

{{< cards >}}
  {{< card link="./pack-structure/" title="Pack structure" subtitle="Source directories, manifests, generated archives, and import preflight" icon="cube" >}}
  {{< card link="./agent-definitions/" title="Agent definitions" subtitle="How .agent.yaml files declare runnable agents and bindings" icon="user" >}}
  {{< card link="./capabilities-and-prompts/" title="Capabilities and prompts" subtitle="How annotated Markdown becomes reusable agent behavior" icon="speakerphone" >}}
{{< /cards >}}