# Understand Supply-Y

Learn what the protocol changes, what crosses a company boundary and where it creates value.

This is a task-focused entry point. Open only the guide required for the next decision or implementation step.

## Guides in this section

1. [Protocol Concepts](https://supply-y.net/docs/markdown/concepts.md): Understand controlled reasoning, Packages, policies, collaboration loops, participant value and Native versus Catena-X transport.
2. [Package Example](https://supply-y.net/docs/markdown/package-example.md): Inspect a complete fixture-backed Supply-Y reasoning Package, including shared fields, hidden data, policy boundaries and response requirements.
3. [Use Cases](https://supply-y.net/docs/markdown/use-cases.md): Compare six fixture-backed Supply-Y collaboration loops for material risk, weekly planning, incident mitigation, quality, engineering change and compliance evidence.
4. [Architecture](https://supply-y.net/docs/markdown/architecture.md): The Supply-Y logical architecture for customer Agents, Native encrypted transport, Catena-X EDC, identity, APIs, storage, events and audit.

For less common topics, browse [all Supply-Y documentation](https://supply-y.net/docs/markdown/all.md).

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Canonical HTML: [Understand Supply-Y](https://supply-y.net/docs/understand)
Agent documentation index: [llms.txt](https://supply-y.net/llms.txt)