diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f4e334..f2c4e8d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.1.0-beta.12-wip]
 
+### Changed
+- **Internal attribute keys now come from the generated registry enums**
+  (`Service.*`, `ExceptionAttributes.*`, `Otel.*`) instead of string
+  literals, across resource creation, exception recording, the
+  `package:logging` bridge, the OTLP span/log transformers, the sampler,
+  and the env resource-attribute parsing. A mistyped key is now a compile
+  error — the same hardening applied to the resource detector after #90.
+  No wire change: `Enum.key` resolves to the identical registry string.
+  
 ### Fixed
 - **`host.arch` no longer reports the hostname** (#90). The IO resource
   detector copy-pasted `Platform.localHostname` into `host.arch`; it now
diff --git a/lib/src/environment/otel_env.dart b/lib/src/environment/otel_env.dart
index 87a66e7..9074cc3 100644
--- a/lib/src/environment/otel_env.dart
+++ b/lib/src/environment/otel_env.dart
@@ -304,9 +304,9 @@ class OTelEnv {
           final key = pair.substring(0, equalIndex).trim();
           final value = pair.substring(equalIndex + 1).trim();
 
-          if (key == 'service.name') {
+          if (key == Service.serviceName.key) {
             config['serviceName'] = value;
-          } else if (key == 'service.version') {
+          } else if (key == Service.serviceVersion.key) {
             config['serviceVersion'] = value;
           }
         }
diff --git a/lib/src/logs/bridge/dart_log_bridge.dart b/lib/src/logs/bridge/dart_log_bridge.dart
index d131f83..5a0ba53 100644
--- a/lib/src/logs/bridge/dart_log_bridge.dart
+++ b/lib/src/logs/bridge/dart_log_bridge.dart
@@ -181,13 +181,13 @@ class DartLogBridge {
     }
     if (error != null) {
       attributes.add(OTelAPI.attributeString(
-          'exception.type', error.runtimeType.toString()));
-      attributes
-          .add(OTelAPI.attributeString('exception.message', error.toString()));
+          ExceptionAttributes.exceptionType.key, error.runtimeType.toString()));
+      attributes.add(OTelAPI.attributeString(
+          ExceptionAttributes.exceptionMessage.key, error.toString()));
     }
     if (stackTrace != null) {
       attributes.add(OTelAPI.attributeString(
-          'exception.stacktrace', stackTrace.toString()));
+          ExceptionAttributes.exceptionStacktrace.key, stackTrace.toString()));
     }
 
     // Emit the log
diff --git a/lib/src/logs/export/console_log_record_exporter.dart b/lib/src/logs/export/console_log_record_exporter.dart
index 836486a..939d029 100644
--- a/lib/src/logs/export/console_log_record_exporter.dart
+++ b/lib/src/logs/export/console_log_record_exporter.dart
@@ -78,7 +78,7 @@ class ConsoleLogRecordExporter implements LogRecordExporter {
     // Format resource
     if (logRecord.resource != null) {
       final serviceName =
-          _getResourceAttribute(logRecord.resource!, 'service.name');
+          _getResourceAttribute(logRecord.resource!, Service.serviceName.key);
       if (serviceName != null) {
         buffer.write(' service=$serviceName');
       }
diff --git a/lib/src/logs/export/otlp/log_record_transformer.dart b/lib/src/logs/export/otlp/log_record_transformer.dart
index a528e91..ee72d09 100644
--- a/lib/src/logs/export/otlp/log_record_transformer.dart
+++ b/lib/src/logs/export/otlp/log_record_transformer.dart
@@ -45,7 +45,7 @@ class OtlpLogRecordTransformer {
       if (OTelLog.isDebug()) {
         OTelLog.debug('LogRecordTransformer: Extracting resource attributes:');
         resourceAttrs.toList().forEach((attr) {
-          if (attr.key == 'service.name') {
+          if (attr.key == Service.serviceName.key) {
             OTelLog.debug('  ${attr.key}: ${attr.value}');
           }
         });
@@ -103,7 +103,7 @@ class OtlpLogRecordTransformer {
   /// Get service name from resource attributes.
   static String _getResourceServiceName(Attributes attributes) {
     for (final attr in attributes.toList()) {
-      if (attr.key == 'service.name') {
+      if (attr.key == Service.serviceName.key) {
         return attr.value.toString();
       }
     }
diff --git a/lib/src/logs/logger_provider.dart b/lib/src/logs/logger_provider.dart
index a774f00..6e8529b 100644
--- a/lib/src/logs/logger_provider.dart
+++ b/lib/src/logs/logger_provider.dart
@@ -181,7 +181,7 @@ class LoggerProvider implements APILoggerProvider {
         if (resource != null) {
           OTelLog.debug('Resource attributes:');
           resource!.attributes.toList().forEach((attr) {
-            if (attr.key == 'service.name') {
+            if (attr.key == Service.serviceName.key) {
               OTelLog.debug('  ${attr.key}: ${attr.value}');
             }
           });
diff --git a/lib/src/otel.dart b/lib/src/otel.dart
index bb93fd3..74700d5 100644
--- a/lib/src/otel.dart
+++ b/lib/src/otel.dart
@@ -276,8 +276,8 @@ class OTel {
     }
 
     final serviceResourceAttributes = {
-      'service.name': serviceName,
-      'service.version': serviceVersion,
+      Service.serviceName.key: serviceName,
+      Service.serviceVersion.key: serviceVersion,
     };
     // Create initial resource with service attributes
     var baseResource = OTel.resource(
@@ -295,7 +295,7 @@ class OTel {
       if (OTelLog.isDebug()) {
         OTelLog.debug('Resource after platform merge:');
         mergedResource.attributes.toList().forEach((attr) {
-          if (attr.key == 'service.name') {
+          if (attr.key == Service.serviceName.key) {
             OTelLog.debug('  ${attr.key}: ${attr.value}');
           }
         });
@@ -309,7 +309,7 @@ class OTel {
       if (OTelLog.isDebug()) {
         OTelLog.debug('Resource after user attributes merge:');
         mergedResource.attributes.toList().forEach((attr) {
-          if (attr.key == 'service.name') {
+          if (attr.key == Service.serviceName.key) {
             OTelLog.debug('  ${attr.key}: ${attr.value}');
           }
         });
@@ -574,7 +574,7 @@ class OTel {
         OTelLog.debug('OTel.tracerProvider: Setting resource from default');
         if (defaultResource != null) {
           defaultResource!.attributes.toList().forEach((attr) {
-            if (attr.key == 'service.name') {
+            if (attr.key == Service.serviceName.key) {
               OTelLog.debug('  ${attr.key}: ${attr.value}');
             }
           });
diff --git a/lib/src/resource/resource.dart b/lib/src/resource/resource.dart
index 2b28160..ee36720 100644
--- a/lib/src/resource/resource.dart
+++ b/lib/src/resource/resource.dart
@@ -95,7 +95,7 @@ class Resource {
     if (OTelLog.isDebug()) {
       OTelLog.debug('Resource merge result attributes:');
       result._attributes.toList().forEach((attr) {
-        if (attr.key == 'service.name') {
+        if (attr.key == Service.serviceName.key) {
           OTelLog.debug('  ${attr.key}: ${attr.value}');
         }
       });
diff --git a/lib/src/trace/export/otlp/span_transformer.dart b/lib/src/trace/export/otlp/span_transformer.dart
index a848f65..c3718e7 100644
--- a/lib/src/trace/export/otlp/span_transformer.dart
+++ b/lib/src/trace/export/otlp/span_transformer.dart
@@ -40,7 +40,7 @@ class OtlpSpanTransformer {
       if (OTelLog.isDebug()) {
         OTelLog.debug('Extracting resource attributes for export:');
         resourceAttrs.toList().forEach((attr) {
-          if (attr.key == 'service.name') {
+          if (attr.key == Service.serviceName.key) {
             OTelLog.debug('  ${attr.key}: ${attr.value}');
           }
         });
@@ -49,7 +49,7 @@ class OtlpSpanTransformer {
       if (OTelLog.isDebug()) {
         OTelLog.debug('Extracting resource attributes for export:');
         resourceAttrs.toList().forEach((attr) {
-          if (attr.key == 'service.name') {
+          if (attr.key == Service.serviceName.key) {
             OTelLog.debug('  ${attr.key}: ${attr.value}');
           }
         });
@@ -104,7 +104,7 @@ class OtlpSpanTransformer {
   /// Get service name from resource attributes
   static String _getResourceServiceName(Attributes attributes) {
     for (final attr in attributes.toList()) {
-      if (attr.key == 'service.name') {
+      if (attr.key == Service.serviceName.key) {
         return attr.value.toString();
       }
     }
diff --git a/lib/src/trace/sampling/counting_sampler.dart b/lib/src/trace/sampling/counting_sampler.dart
index 9149fe3..6b76fd2 100644
--- a/lib/src/trace/sampling/counting_sampler.dart
+++ b/lib/src/trace/sampling/counting_sampler.dart
@@ -135,8 +135,8 @@ class ErrorSamplingCondition extends SamplingCondition {
     if (attributes == null) return false;
 
     // Check for error status
-    final statusCode = attributes.getString('otel.status_code');
-    final statusMessage = attributes.getString('otel.status_description');
+    final statusCode = attributes.getString(Otel.otelStatusCode.key);
+    final statusMessage = attributes.getString(Otel.otelStatusDescription.key);
 
     return statusCode == 'ERROR' ||
         (statusMessage != null && statusMessage.isNotEmpty);
diff --git a/lib/src/trace/tracer.dart b/lib/src/trace/tracer.dart
index a52bde4..1980d03 100644
--- a/lib/src/trace/tracer.dart
+++ b/lib/src/trace/tracer.dart
@@ -514,8 +514,8 @@ class Tracer implements APITracer {
           error,
           stackTrace: sanitized.stackTrace,
           attributes: OTel.attributesFromMap(<String, Object>{
-            'exception.type': sanitized.type,
-            'exception.message': sanitized.message,
+            ExceptionAttributes.exceptionType.key: sanitized.type,
+            ExceptionAttributes.exceptionMessage.key: sanitized.message,
           }),
         );
       }
diff --git a/lib/src/trace/tracer_provider.dart b/lib/src/trace/tracer_provider.dart
index c39fdec..88b4e59 100644
--- a/lib/src/trace/tracer_provider.dart
+++ b/lib/src/trace/tracer_provider.dart
@@ -227,7 +227,7 @@ class TracerProvider implements APITracerProvider {
         if (resource != null) {
           OTelLog.debug('Resource attributes:');
           resource!.attributes.toList().forEach((attr) {
-            if (attr.key == 'service.name') {
+            if (attr.key == Service.serviceName.key) {
               OTelLog.debug('  ${attr.key}: ${attr.value}');
             }
           });