diff --git a/src/app/endpoints/a2a.py b/src/app/endpoints/a2a.py
index a00ece91e..e5fe2abd1 100644
--- a/src/app/endpoints/a2a.py
+++ b/src/app/endpoints/a2a.py
@@ -340,7 +340,7 @@ async def _process_task_streaming(  # pylint: disable=too-many-locals
             stream = await client.responses.create(**responses_params.model_dump())
         except APIConnectionError as e:
             error_message = (
-                f"Unable to connect to Llama Stack backend service: {str(e)}. "
+                f"Unable to connect to Llama Stack backend service: {e!s}. "
                 "The service may be temporarily unavailable. Please try again later."
             )
             logger.error(
diff --git a/src/app/endpoints/health.py b/src/app/endpoints/health.py
index 7a8058d79..563f2fca1 100644
--- a/src/app/endpoints/health.py
+++ b/src/app/endpoints/health.py
@@ -91,7 +91,7 @@ async def get_providers_health_statuses() -> list[ProviderHealthStatus]:
             ProviderHealthStatus(
                 provider_id="unknown",
                 status=HealthStatus.ERROR.value,
-                message=f"Failed to initialize health check: {str(e)}",
+                message=f"Failed to initialize health check: {e!s}",
             )
         ]