diff --git a/Dalamud.Test/Compliance/PublicApiTests.cs b/Dalamud.Test/Compliance/PublicApiTests.cs
new file mode 100644
index 000000000..4e51bb932
--- /dev/null
+++ b/Dalamud.Test/Compliance/PublicApiTests.cs
@@ -0,0 +1,76 @@
+using System;
+using System.Linq;
+using System.Reflection;
+
+using Dalamud.Utility;
+
+using Xunit;
+using Xunit.Abstractions;
+
+
+namespace Dalamud.Test.Compliance;
+
+public class PublicApiTests
+{
+    private readonly ITestOutputHelper testOutputHelper;
+    public PublicApiTests(ITestOutputHelper testOutputHelper)
+    {
+        this.testOutputHelper = testOutputHelper;
+    }
+
+    [Fact]
+    public void NoClientStructsTypes()
+    {
+        var clientStructsAssembly = typeof(FFXIVClientStructs.ThisAssembly).Assembly;
+
+        var publicTypes = typeof(Dalamud).Assembly.GetTypes().Where(t => t.IsPublic);
+
+        foreach (var t in publicTypes)
+        {
+            if (t.GetCustomAttribute<ObsoleteAttribute>() != null) continue;
+
+            var methods = t.GetMethods().Where(m => m.IsPublic && !m.IsSpecialName);
+
+            foreach (var m in methods)
+            {
+                if (m.GetCustomAttribute<ObsoleteAttribute>() != null || m.GetCustomAttribute<Api14ToDoAttribute>() != null) continue;
+                if (m.IsPrivate) continue;
+
+                if (m.ReturnType.Assembly == clientStructsAssembly)
+                {
+                    Assert.Fail($"Method {t.FullName}.{m.Name} returns a type from FFXIVClientStructs: {m.ReturnType.FullName}");
+                }
+
+                foreach (var param in m.GetParameters())
+                {
+                    if (param.ParameterType.Assembly == clientStructsAssembly)
+                    {
+                        Assert.Fail($"Method {t.FullName}.{m.Name} has a parameter from FFXIVClientStructs: {param.ParameterType.FullName}");
+                    }
+                }
+            }
+
+            foreach (var p in t.GetProperties())
+            {
+                if (p.GetCustomAttribute<ObsoleteAttribute>() != null || p.GetCustomAttribute<Api14ToDoAttribute>() != null) continue;
+                if (p.GetMethod?.IsPrivate == true && p.SetMethod?.IsPrivate == true) continue;
+
+                if (p.PropertyType.Assembly == clientStructsAssembly)
+                {
+                    Assert.Fail($"Property {t.FullName}.{p.Name} is a type from FFXIVClientStructs: {p.PropertyType.FullName}");
+                }
+            }
+
+            foreach (var field in t.GetFields())
+            {
+                if (field.GetCustomAttribute<ObsoleteAttribute>() != null || field.GetCustomAttribute<Api14ToDoAttribute>() != null) continue;
+                if (field.IsPrivate) continue;
+
+                if (field.FieldType.Assembly == clientStructsAssembly)
+                {
+                    Assert.Fail($"Field {t.FullName}.{field.Name} is of a type from FFXIVClientStructs: {field.FieldType.FullName}");
+                }
+            }
+        }
+    }
+}
diff --git a/Dalamud.Test/Dalamud.Test.csproj b/Dalamud.Test/Dalamud.Test.csproj
index c6c8f8e8a..0839a39d3 100644
--- a/Dalamud.Test/Dalamud.Test.csproj
+++ b/Dalamud.Test/Dalamud.Test.csproj
@@ -43,14 +43,14 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
-        <PackageReference Include="xunit" Version="2.4.1" />
+        <PackageReference Include="xunit" Version="2.4.2" />
         <PackageReference Include="xunit.abstractions" Version="2.0.3" />
-        <PackageReference Include="xunit.analyzers" Version="0.10.0" />
-        <PackageReference Include="xunit.assert" Version="2.4.1" />
-        <PackageReference Include="xunit.core" Version="2.4.1" />
-        <PackageReference Include="xunit.extensibility.core" Version="2.4.1" />
-        <PackageReference Include="xunit.extensibility.execution" Version="2.4.1" />
-        <PackageReference Include="xunit.runner.console" Version="2.4.1">
+        <PackageReference Include="xunit.analyzers" Version="1.0.0" />
+        <PackageReference Include="xunit.assert" Version="2.4.2" />
+        <PackageReference Include="xunit.core" Version="2.4.2" />
+        <PackageReference Include="xunit.extensibility.core" Version="2.4.2" />
+        <PackageReference Include="xunit.extensibility.execution" Version="2.4.2" />
+        <PackageReference Include="xunit.runner.console" Version="2.4.2">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
diff --git a/Dalamud/Memory/MemoryHelper.cs b/Dalamud/Memory/MemoryHelper.cs
index 2eae1be6d..acdc37a34 100644
--- a/Dalamud/Memory/MemoryHelper.cs
+++ b/Dalamud/Memory/MemoryHelper.cs
@@ -382,6 +382,8 @@ public static unsafe class MemoryHelper
     /// <param name="utf8String">The memory address to read from.</param>
     /// <returns>The read in string.</returns>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [Obsolete("CS types in Dalamud are deprecated.")]
+    [Api14ToDo(Api14ToDoAttribute.Remove)]
     public static SeString ReadSeString(Utf8String* utf8String) =>
         utf8String == null ? string.Empty : SeString.Parse(utf8String->AsSpan());
 
@@ -613,6 +615,8 @@ public static unsafe class MemoryHelper
     /// <param name="utf8String">The memory address to read from.</param>
     /// <param name="value">The read in string.</param>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [Obsolete("CS types in Dalamud are deprecated.")]
+    [Api14ToDo(Api14ToDoAttribute.Remove)]
     public static unsafe void ReadSeString(Utf8String* utf8String, out SeString value)
         => value = ReadSeString(utf8String);
 
diff --git a/Dalamud/Utility/Numerics/VectorExtensions.cs b/Dalamud/Utility/Numerics/VectorExtensions.cs
index 910dbdd00..ffb32b266 100644
--- a/Dalamud/Utility/Numerics/VectorExtensions.cs
+++ b/Dalamud/Utility/Numerics/VectorExtensions.cs
@@ -56,6 +56,8 @@ public static class VectorExtensions
         return new Vector2(v.X, y);
     }
 
+    [Obsolete("CS type is deprecated. Use ByteColor instead.")]
+    [Api14ToDo(Api14ToDoAttribute.Remove)]
     public static ByteColor ToByteColor(this Vector4 v)
     {
         return new ByteColor { A = (byte)(v.W * 255), R = (byte)(v.X * 255), G = (byte)(v.Y * 255), B = (byte)(v.Z * 255) };