diff --git a/psalm.xml b/psalm.xml
index f6603e7..e05e5e0 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -10,18 +10,16 @@
     findUnusedPsalmSuppress="true"
     findUnusedBaselineEntry="true"
     findUnusedCode="false"
-    ensureOverrideAttribute="false"
+    ensureOverrideAttribute="true"
     findUnusedVariablesAndParams="true"
     ensureArrayStringOffsetsExist="true"
     addParamDefaultToDocblockType="true"
 >
     <issueHandlers>
+        <!-- Runtime guards for callers that ignore docblock types (Context offsets, service interface NAME). -->
         <RedundantConditionGivenDocblockType errorLevel="suppress" />
-        <MixedReturnStatement errorLevel="suppress" />
-        <UnusedPsalmSuppress errorLevel="suppress" />
-        <InvalidAttribute errorLevel="suppress" />
-        <UndefinedAttributeClass errorLevel="suppress" />
         <DocblockTypeContradiction errorLevel="suppress" />
+        <!-- Typed class constants need PHP 8.3, the package supports 8.2. -->
         <MissingClassConstType errorLevel="suppress" />
     </issueHandlers>
     <projectFiles>
diff --git a/src/Method.php b/src/Method.php
index b1e821a..fcebbad 100644
--- a/src/Method.php
+++ b/src/Method.php
@@ -124,7 +124,6 @@ private static function assertContextParameter(\ReflectionMethod $method, \Refle
             // If the type is not declared as a generic "mixed" or "object",
             // then it can only be a type that implements ContextInterface.
             if (!\in_array($type->getName(), ['mixed', 'object'], true)) {
-                /** @psalm-suppress ArgumentTypeCoercion */
                 $isContextImplementedType = !$type->isBuiltin()
                     && (new \ReflectionClass($type->getName()))->implementsInterface(ContextInterface::class);
 
@@ -172,7 +171,6 @@ private static function assertInputParameter(\ReflectionMethod $method, \Reflect
             throw new \DomainException($message, 0x05);
         }
 
-        /** @psalm-suppress ArgumentTypeCoercion */
         $isProtobufMessageType = !$type->isBuiltin()
             && (new \ReflectionClass($type->getName()))
                 ->isSubclassOf(Message::class);
@@ -207,7 +205,6 @@ private static function assertOutputReturnType(\ReflectionMethod $method): void
             throw new \DomainException($message, 0x08);
         }
 
-        /** @psalm-suppress ArgumentTypeCoercion */
         $isProtobufMessageType = !$type->isBuiltin()
             && (new \ReflectionClass($type->getName()))->isSubclassOf(Message::class);
 
diff --git a/src/Server.php b/src/Server.php
index 78607fc..a782314 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -140,9 +140,6 @@ private function workerError(WorkerInterface $worker, string $message): void
         $worker->error($message);
     }
 
-    /**
-     * @psalm-suppress InaccessibleMethod
-     */
     private function workerSend(WorkerInterface $worker, string $body, string $headers): void
     {
         $worker->respond(new Payload($body, $headers));
diff --git a/tests/Stub/TestService.php b/tests/Stub/TestService.php
index b98d914..23730ab 100644
--- a/tests/Stub/TestService.php
+++ b/tests/Stub/TestService.php
@@ -15,11 +15,13 @@
 
 class TestService implements TestInterface
 {
+    #[Override]
     public function Echo(ContextInterface $ctx, Message $in): Message
     {
         return $in->setMsg('pong');
     }
 
+    #[Override]
     public function Throw(ContextInterface $ctx, Message $in): Message
     {
         $out = new Message();
@@ -55,6 +57,7 @@ public function Throw(ContextInterface $ctx, Message $in): Message
         return $out;
     }
 
+    #[Override]
     public function Die(ContextInterface $ctx, Message $in): Message
     {
         \error_log($in->getMsg());
@@ -62,6 +65,7 @@ public function Die(ContextInterface $ctx, Message $in): Message
         return $in;
     }
 
+    #[Override]
     public function Info(ContextInterface $ctx, Message $in): Message
     {
         $out = new Message();
@@ -86,6 +90,7 @@ public function Info(ContextInterface $ctx, Message $in): Message
         return $out;
     }
 
+    #[Override]
     public function Ping(GRPC\ContextInterface $ctx, EmptyMessage $in): EmptyMessage
     {
         return new EmptyMessage();