Runtime/AgentCore/Editor/ModelStreamingAssetsBuildStep.cs

#if UNITY_EDITOR
using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using OnDeviceAgent.Inference;

namespace OnDeviceAgent.AgentCore.Editor
{
    // The com.sky.sentis.* weights aren't committed (fetched from Hugging Face into Models~ on demand), and the
    // Editor loads them straight from the packages. A player build needs them baked into StreamingAssets, so
    // ensure they're downloaded, copy them in before the build, and remove them afterwards to keep the tree clean.
    public sealed class ModelStreamingAssetsBuildStep : IPreprocessBuildWithReport, IPostprocessBuildWithReport
    {
        public int callbackOrder => 0;

        public void OnPreprocessBuild(BuildReport report)
        {
            SentisModelProvisioner.EnsureAll();
            ModelPathResolver.ProvisionToStreamingAssets();
            AssetDatabase.Refresh();
        }

        public void OnPostprocessBuild(BuildReport report)
        {
            ModelPathResolver.RemoveFromStreamingAssets();
            AssetDatabase.Refresh();
        }
    }
}
#endif