# contentSourceBuildSessionGuid

> For scripts-only or incremental Player builds that reuse an earlier build's content, the _buildSessionGuid of that source build. A default-valued GUID for all other builds.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor.Build.Reporting](/engine/6000.6/script-reference/unityeditor/build/reporting.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public readonly GUID contentSourceBuildSessionGuid { get; }
```

### Remarks

Scripts-only and incremental builds recompile scripts but reuse the content of a prior full build, so they record no content of their own. Use this identifier with the [BuildHistory](/engine/6000.6/script-reference/unityeditor/build/buildhistory.md) API to look up the source build and its recorded content information.