diff --git a/src/guidellm/benchmark/profiles.py b/src/guidellm/benchmark/profiles.py
index 08fea0efc..848722809 100644
--- a/src/guidellm/benchmark/profiles.py
+++ b/src/guidellm/benchmark/profiles.py
@@ -432,6 +432,10 @@ def resolve_args(
         kwargs.pop("random_seed", None)
         if rate is not None and len(rate) > 0:
             kwargs["max_concurrency"] = rate[0]
+        else:
+            # Require explicit max_concurrency; in the future max_concurrency
+            # should be dynamic and rate can specify some tunable
+            raise ValueError("ThroughputProfile requires a rate parameter")
         return kwargs
 
     @property
diff --git a/src/guidellm/scheduler/strategies.py b/src/guidellm/scheduler/strategies.py
index dfdd97f58..0522d300a 100644
--- a/src/guidellm/scheduler/strategies.py
+++ b/src/guidellm/scheduler/strategies.py
@@ -387,7 +387,7 @@ def __str__(self) -> str:
         """
         :return: String identifier for throughput strategy
         """
-        return "throughput"
+        return f"throughput@{self.max_concurrency or 'unlimited'}"
 
     @property
     def processes_limit(self) -> PositiveInt | None:
diff --git a/tests/unit/scheduler/test_strategies.py b/tests/unit/scheduler/test_strategies.py
index 7f01fc89b..cc9d3b0a4 100644
--- a/tests/unit/scheduler/test_strategies.py
+++ b/tests/unit/scheduler/test_strategies.py
@@ -335,9 +335,10 @@ def test_string_representation(
         self, valid_instances: tuple[ThroughputStrategy, dict]
     ):
         """Test __str__ method for ThroughputStrategy."""
-        instance, _ = valid_instances
+        instance, constructor_args = valid_instances
+        max_concurrency = constructor_args.get("max_concurrency")
         result = str(instance)
-        assert result == "throughput"
+        assert result == f"throughput@{max_concurrency or 'unlimited'}"
 
     @pytest.mark.smoke
     def test_marshalling(self, valid_instances: tuple[ThroughputStrategy, dict]):