diff --git a/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Conversions.h b/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Conversions.h
index 4922a6e..5eab9ff 100644
--- a/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Conversions.h
+++ b/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Conversions.h
@@ -99,6 +99,9 @@
         const ::aidl::android::hardware::common::NativeHandle& handle);
 GeneralResult<SyncFence> unvalidatedConvert(const ndk::ScopedFileDescriptor& syncFence);
 
+GeneralResult<std::vector<Operation>> unvalidatedConvert(
+        const std::vector<aidl_hal::Operation>& operations);
+
 GeneralResult<Capabilities> convert(const aidl_hal::Capabilities& capabilities);
 GeneralResult<DeviceType> convert(const aidl_hal::DeviceType& deviceType);
 GeneralResult<ErrorStatus> convert(const aidl_hal::ErrorStatus& errorStatus);
@@ -106,16 +109,13 @@
         const aidl_hal::ExecutionPreference& executionPreference);
 GeneralResult<SharedMemory> convert(const aidl_hal::Memory& memory);
 GeneralResult<Model> convert(const aidl_hal::Model& model);
-GeneralResult<Operand> convert(const aidl_hal::Operand& operand);
 GeneralResult<OperandType> convert(const aidl_hal::OperandType& operandType);
 GeneralResult<Priority> convert(const aidl_hal::Priority& priority);
-GeneralResult<Request::MemoryPool> convert(const aidl_hal::RequestMemoryPool& memoryPool);
 GeneralResult<Request> convert(const aidl_hal::Request& request);
 GeneralResult<Timing> convert(const aidl_hal::Timing& timing);
 GeneralResult<SyncFence> convert(const ndk::ScopedFileDescriptor& syncFence);
 
 GeneralResult<std::vector<Extension>> convert(const std::vector<aidl_hal::Extension>& extension);
-GeneralResult<std::vector<Operation>> convert(const std::vector<aidl_hal::Operation>& outputShapes);
 GeneralResult<std::vector<SharedMemory>> convert(const std::vector<aidl_hal::Memory>& memories);
 GeneralResult<std::vector<OutputShape>> convert(
         const std::vector<aidl_hal::OutputShape>& outputShapes);
diff --git a/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Utils.h b/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Utils.h
index 58dcfe3..316d34f 100644
--- a/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Utils.h
+++ b/neuralnetworks/aidl/utils/include/nnapi/hal/aidl/Utils.h
@@ -21,6 +21,7 @@
 
 #include <android-base/logging.h>
 #include <nnapi/Result.h>
+#include <nnapi/TypeUtils.h>
 #include <nnapi/Types.h>
 #include <nnapi/Validation.h>
 #include <nnapi/hal/HandleError.h>
@@ -48,6 +49,22 @@
     return result.has_value();
 }
 
+template <typename Type>
+nn::GeneralResult<void> compliantVersion(const Type& canonical) {
+    const auto version = NN_TRY(::android::hardware::neuralnetworks::utils::makeGeneralFailure(
+            nn::validate(canonical)));
+    if (version > kVersion) {
+        return NN_ERROR() << "Insufficient version: " << version << " vs required " << kVersion;
+    }
+    return {};
+}
+
+template <typename Type>
+auto convertFromNonCanonical(const Type& nonCanonicalObject)
+        -> decltype(convert(nn::convert(nonCanonicalObject).value())) {
+    return convert(NN_TRY(nn::convert(nonCanonicalObject)));
+}
+
 nn::GeneralResult<Memory> clone(const Memory& memory);
 nn::GeneralResult<Request> clone(const Request& request);
 nn::GeneralResult<RequestMemoryPool> clone(const RequestMemoryPool& requestPool);
diff --git a/neuralnetworks/aidl/utils/src/Conversions.cpp b/neuralnetworks/aidl/utils/src/Conversions.cpp
index 45bc005..c74c509 100644
--- a/neuralnetworks/aidl/utils/src/Conversions.cpp
+++ b/neuralnetworks/aidl/utils/src/Conversions.cpp
@@ -41,6 +41,8 @@
 #include <type_traits>
 #include <utility>
 
+#include "Utils.h"
+
 #define VERIFY_NON_NEGATIVE(value) \
     while (UNLIKELY(value < 0)) return NN_ERROR()
 
@@ -53,7 +55,6 @@
     return static_cast<std::underlying_type_t<Type>>(value);
 }
 
-constexpr auto kVersion = android::nn::Version::ANDROID_S;
 constexpr int64_t kNoTiming = -1;
 
 }  // namespace
@@ -63,32 +64,6 @@
 
 using ::aidl::android::hardware::common::NativeHandle;
 
-constexpr auto validOperandType(nn::OperandType operandType) {
-    switch (operandType) {
-        case nn::OperandType::FLOAT32:
-        case nn::OperandType::INT32:
-        case nn::OperandType::UINT32:
-        case nn::OperandType::TENSOR_FLOAT32:
-        case nn::OperandType::TENSOR_INT32:
-        case nn::OperandType::TENSOR_QUANT8_ASYMM:
-        case nn::OperandType::BOOL:
-        case nn::OperandType::TENSOR_QUANT16_SYMM:
-        case nn::OperandType::TENSOR_FLOAT16:
-        case nn::OperandType::TENSOR_BOOL8:
-        case nn::OperandType::FLOAT16:
-        case nn::OperandType::TENSOR_QUANT8_SYMM_PER_CHANNEL:
-        case nn::OperandType::TENSOR_QUANT16_ASYMM:
-        case nn::OperandType::TENSOR_QUANT8_SYMM:
-        case nn::OperandType::TENSOR_QUANT8_ASYMM_SIGNED:
-        case nn::OperandType::SUBGRAPH:
-            return true;
-        case nn::OperandType::OEM:
-        case nn::OperandType::TENSOR_OEM_BYTE:
-            return false;
-    }
-    return nn::isExtension(operandType);
-}
-
 template <typename Input>
 using UnvalidatedConvertOutput =
         std::decay_t<decltype(unvalidatedConvert(std::declval<Input>()).value())>;
@@ -113,14 +88,7 @@
 template <typename Type>
 GeneralResult<UnvalidatedConvertOutput<Type>> validatedConvert(const Type& halObject) {
     auto canonical = NN_TRY(nn::unvalidatedConvert(halObject));
-    const auto maybeVersion = validate(canonical);
-    if (!maybeVersion.has_value()) {
-        return error() << maybeVersion.error();
-    }
-    const auto version = maybeVersion.value();
-    if (version > kVersion) {
-        return NN_ERROR() << "Insufficient version: " << version << " vs required " << kVersion;
-    }
+    NN_TRY(aidl_hal::utils::compliantVersion(canonical));
     return canonical;
 }
 
@@ -185,13 +153,21 @@
 
 GeneralResult<OperandType> unvalidatedConvert(const aidl_hal::OperandType& operandType) {
     VERIFY_NON_NEGATIVE(underlyingType(operandType)) << "Negative operand types are not allowed.";
-    return static_cast<OperandType>(operandType);
+    const auto canonical = static_cast<OperandType>(operandType);
+    if (canonical == OperandType::OEM || canonical == OperandType::TENSOR_OEM_BYTE) {
+        return NN_ERROR() << "Unable to convert invalid OperandType " << canonical;
+    }
+    return canonical;
 }
 
 GeneralResult<OperationType> unvalidatedConvert(const aidl_hal::OperationType& operationType) {
     VERIFY_NON_NEGATIVE(underlyingType(operationType))
             << "Negative operation types are not allowed.";
-    return static_cast<OperationType>(operationType);
+    const auto canonical = static_cast<OperationType>(operationType);
+    if (canonical == OperationType::OEM_OPERATION) {
+        return NN_ERROR() << "Unable to convert invalid OperationType OEM_OPERATION";
+    }
+    return canonical;
 }
 
 GeneralResult<DeviceType> unvalidatedConvert(const aidl_hal::DeviceType& deviceType) {
@@ -206,8 +182,7 @@
     const bool validOperandTypes = std::all_of(
             capabilities.operandPerformance.begin(), capabilities.operandPerformance.end(),
             [](const aidl_hal::OperandPerformance& operandPerformance) {
-                const auto maybeType = unvalidatedConvert(operandPerformance.type);
-                return !maybeType.has_value() ? false : validOperandType(maybeType.value());
+                return validatedConvert(operandPerformance.type).has_value();
             });
     if (!validOperandTypes) {
         return NN_ERROR() << "Invalid OperandType when unvalidatedConverting OperandPerformance in "
@@ -534,6 +509,11 @@
     return std::make_shared<const Handle>(NN_TRY(unvalidatedConvertHelper(aidlNativeHandle)));
 }
 
+GeneralResult<std::vector<Operation>> unvalidatedConvert(
+        const std::vector<aidl_hal::Operation>& operations) {
+    return unvalidatedConvertVec(operations);
+}
+
 GeneralResult<SyncFence> unvalidatedConvert(const ndk::ScopedFileDescriptor& syncFence) {
     auto duplicatedFd = NN_TRY(dupFd(syncFence.get()));
     return SyncFence::create(std::move(duplicatedFd));
@@ -564,22 +544,14 @@
     return validatedConvert(model);
 }
 
-GeneralResult<Operand> convert(const aidl_hal::Operand& operand) {
-    return unvalidatedConvert(operand);
-}
-
 GeneralResult<OperandType> convert(const aidl_hal::OperandType& operandType) {
-    return unvalidatedConvert(operandType);
+    return validatedConvert(operandType);
 }
 
 GeneralResult<Priority> convert(const aidl_hal::Priority& priority) {
     return validatedConvert(priority);
 }
 
-GeneralResult<Request::MemoryPool> convert(const aidl_hal::RequestMemoryPool& memoryPool) {
-    return unvalidatedConvert(memoryPool);
-}
-
 GeneralResult<Request> convert(const aidl_hal::Request& request) {
     return validatedConvert(request);
 }
@@ -589,17 +561,13 @@
 }
 
 GeneralResult<SyncFence> convert(const ndk::ScopedFileDescriptor& syncFence) {
-    return unvalidatedConvert(syncFence);
+    return validatedConvert(syncFence);
 }
 
 GeneralResult<std::vector<Extension>> convert(const std::vector<aidl_hal::Extension>& extension) {
     return validatedConvert(extension);
 }
 
-GeneralResult<std::vector<Operation>> convert(const std::vector<aidl_hal::Operation>& operations) {
-    return unvalidatedConvert(operations);
-}
-
 GeneralResult<std::vector<SharedMemory>> convert(const std::vector<aidl_hal::Memory>& memories) {
     return validatedConvert(memories);
 }
@@ -644,14 +612,7 @@
 
 template <typename Type>
 nn::GeneralResult<UnvalidatedConvertOutput<Type>> validatedConvert(const Type& canonical) {
-    const auto maybeVersion = nn::validate(canonical);
-    if (!maybeVersion.has_value()) {
-        return nn::error() << maybeVersion.error();
-    }
-    const auto version = maybeVersion.value();
-    if (version > kVersion) {
-        return NN_ERROR() << "Insufficient version: " << version << " vs required " << kVersion;
-    }
+    NN_TRY(compliantVersion(canonical));
     return utils::unvalidatedConvert(canonical);
 }
 
@@ -797,6 +758,9 @@
 }
 
 nn::GeneralResult<OperandType> unvalidatedConvert(const nn::OperandType& operandType) {
+    if (operandType == nn::OperandType::OEM || operandType == nn::OperandType::TENSOR_OEM_BYTE) {
+        return NN_ERROR() << "Unable to convert invalid OperandType " << operandType;
+    }
     return static_cast<OperandType>(operandType);
 }
 
@@ -864,6 +828,9 @@
 }
 
 nn::GeneralResult<OperationType> unvalidatedConvert(const nn::OperationType& operationType) {
+    if (operationType == nn::OperationType::OEM_OPERATION) {
+        return NN_ERROR() << "Unable to convert invalid OperationType OEM_OPERATION";
+    }
     return static_cast<OperationType>(operationType);
 }
 
@@ -1004,7 +971,7 @@
 }
 
 nn::GeneralResult<std::vector<uint8_t>> convert(const nn::CacheToken& cacheToken) {
-    return unvalidatedConvert(cacheToken);
+    return validatedConvert(cacheToken);
 }
 
 nn::GeneralResult<BufferDesc> convert(const nn::BufferDesc& bufferDesc) {
@@ -1076,7 +1043,7 @@
 
 nn::GeneralResult<std::vector<ndk::ScopedFileDescriptor>> convert(
         const std::vector<nn::SyncFence>& syncFences) {
-    return unvalidatedConvert(syncFences);
+    return validatedConvert(syncFences);
 }
 
 nn::GeneralResult<std::vector<int32_t>> toSigned(const std::vector<uint32_t>& vec) {