| Category | Category |
| Description | Human readable name e.g Physics Prop |
| DisplayName | Display name e.g Physics Prop |
| EditorHelpers | In-editor helpers for this class, such as box visualizers for certain properties, etc. |
| GameIdent | What game does this belong to? ( TODO: Might not be best place for this? ) |
| Icon | Icon ( Material ) |
| Inputs | List of inputs for this class. |
| IsCableClass | A cable entity, will appear in the Path Tool. |
| IsPathClass | A path entity, will appear in the Path Tool. |
| IsPointClass | A point entity, i.e. a model entity, etc. |
| IsSolidClass | A solid class entity, triggers, etc., entities that are tied to from a mesh in Hammer |
| Metadata | General purpose key-value store to alter functionality of UI, map compilation, editor helpers, etc. |
| Name | Class name e.g prop_physics |
| Outputs | List of outputs for this class. |
| Package | What package did this entity come from? |
| Tags | General purpose tags, some with special meanings within Hammer and map compilers. |
| Type | C# Type of this class |
| Variables | List of properties exposed to tools for this class. |