# Rudder CLI Validation Rules


Every spec you apply with the Rudder CLI is checked against the rules in this guide before it reaches your workspace.

Each rule includes <span class="vr-term vr-term--valid">valid</span> and <span class="vr-term vr-term--invalid">invalid</span> example specs and the diagnostics you see when validation fails.

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**How to use this guide**

- Use the **Spec version** toggle to switch between `rudder/v1` and legacy `rudder/0.1` spec. 
- Filter by **phase** or search to narrow the list.
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