diff --git a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Headers/AGTypeID.h b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Headers/AGTypeID.h
index d6ce4e88..b7a48f34 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Headers/AGTypeID.h
+++ b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Headers/AGTypeID.h
@@ -20,6 +20,10 @@ AG_EXPORT
 AG_REFINED_FOR_SWIFT
 AGTypeKind AGTypeGetKind(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.kind(self:));
 
+AG_EXPORT
+AG_REFINED_FOR_SWIFT
+const void * AGTypeNominalDescriptor(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.nominalDescriptor(self:));
+
 AG_EXTERN_C_END
 
 #endif /* AGTypeID_h */
diff --git a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Headers/AGTypeID.h b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Headers/AGTypeID.h
index d6ce4e88..b7a48f34 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Headers/AGTypeID.h
+++ b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Headers/AGTypeID.h
@@ -20,6 +20,10 @@ AG_EXPORT
 AG_REFINED_FOR_SWIFT
 AGTypeKind AGTypeGetKind(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.kind(self:));
 
+AG_EXPORT
+AG_REFINED_FOR_SWIFT
+const void * AGTypeNominalDescriptor(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.nominalDescriptor(self:));
+
 AG_EXTERN_C_END
 
 #endif /* AGTypeID_h */
diff --git a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Headers/AGTypeID.h b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Headers/AGTypeID.h
index d6ce4e88..b7a48f34 100644
--- a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Headers/AGTypeID.h
+++ b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Headers/AGTypeID.h
@@ -20,6 +20,10 @@ AG_EXPORT
 AG_REFINED_FOR_SWIFT
 AGTypeKind AGTypeGetKind(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.kind(self:));
 
+AG_EXPORT
+AG_REFINED_FOR_SWIFT
+const void * AGTypeNominalDescriptor(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.nominalDescriptor(self:));
+
 AG_EXTERN_C_END
 
 #endif /* AGTypeID_h */
diff --git a/AG/Sources/Headers/AGTypeID.h b/AG/Sources/Headers/AGTypeID.h
index d6ce4e88..b7a48f34 100644
--- a/AG/Sources/Headers/AGTypeID.h
+++ b/AG/Sources/Headers/AGTypeID.h
@@ -20,6 +20,10 @@ AG_EXPORT
 AG_REFINED_FOR_SWIFT
 AGTypeKind AGTypeGetKind(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.kind(self:));
 
+AG_EXPORT
+AG_REFINED_FOR_SWIFT
+const void * AGTypeNominalDescriptor(AGTypeID typeID) AG_SWIFT_NAME(getter:AGTypeID.nominalDescriptor(self:));
+
 AG_EXTERN_C_END
 
 #endif /* AGTypeID_h */
diff --git a/Sources/_OpenGraph/Runtime/OGTypeID.cpp b/Sources/_OpenGraph/Runtime/OGTypeID.cpp
index 5c0eb25a..58766aaa 100644
--- a/Sources/_OpenGraph/Runtime/OGTypeID.cpp
+++ b/Sources/_OpenGraph/Runtime/OGTypeID.cpp
@@ -11,3 +11,7 @@ OGTypeKind OGTypeGetKind(OGTypeID typeID) {
     // FIXME: Unimplemented
     return OGTypeKindNone;
 }
+
+const void * OGTypeNominalDescriptor(OGTypeID typeID) {
+    return nullptr;
+}
diff --git a/Sources/_OpenGraph/Runtime/OGTypeID.h b/Sources/_OpenGraph/Runtime/OGTypeID.h
index ee6a8aa2..2e2fc72a 100644
--- a/Sources/_OpenGraph/Runtime/OGTypeID.h
+++ b/Sources/_OpenGraph/Runtime/OGTypeID.h
@@ -20,6 +20,10 @@ OG_EXPORT
 OG_REFINED_FOR_SWIFT
 OGTypeKind OGTypeGetKind(OGTypeID typeID) OG_SWIFT_NAME(getter:OGTypeID.kind(self:));
 
+OG_EXPORT
+OG_REFINED_FOR_SWIFT
+const void * OGTypeNominalDescriptor(OGTypeID typeID) OG_SWIFT_NAME(getter:OGTypeID.nominalDescriptor(self:));
+
 OG_EXTERN_C_END
 
 #endif /* OGTypeID_h */
diff --git a/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift b/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift
new file mode 100644
index 00000000..969b52e9
--- /dev/null
+++ b/Tests/OpenGraphCompatibilityTests/Runtime/OGTypeIDTests.swift
@@ -0,0 +1,19 @@
+//
+//  OGTypeIDTests.swift
+//  OpenGraphCompatibilityTests
+
+import Testing
+
+@Suite(.disabled(if: !compatibilityTestEnabled, "OGTypeID is not implemented"))
+struct OGTypeIDTests {
+
+    @Test
+    func descriptor() throws {
+        let n1 = try #require(OGTypeID(Int.self).nominalDescriptor)
+        let n2 = try #require(OGTypeID(String.self).nominalDescriptor)
+        let n3 = try #require(OGTypeID(Int.self).nominalDescriptor)
+        
+        #expect(n1 != n2)
+        #expect(n1 == n3)
+    }
+}
diff --git a/Tests/OpenGraphCompatibilityTests/Runtime/TupleTypeTests.swift b/Tests/OpenGraphCompatibilityTests/Runtime/TupleTypeTests.swift
index 12cc69e1..3781d3cf 100644
--- a/Tests/OpenGraphCompatibilityTests/Runtime/TupleTypeTests.swift
+++ b/Tests/OpenGraphCompatibilityTests/Runtime/TupleTypeTests.swift
@@ -1,8 +1,6 @@
 //
 //  TupleTypeTests.swift
-//  
-//
-//
+//  OpenGraphCompatibilityTests
 
 import Testing