diff --git a/samples/python/hosted-agents/agent-framework/human-in-the-loop/workflow-agent-with-checkpoint-and-hitl/main.py b/samples/python/hosted-agents/agent-framework/human-in-the-loop/workflow-agent-with-checkpoint-and-hitl/main.py
index 487a36b14..f868c29bb 100644
--- a/samples/python/hosted-agents/agent-framework/human-in-the-loop/workflow-agent-with-checkpoint-and-hitl/main.py
+++ b/samples/python/hosted-agents/agent-framework/human-in-the-loop/workflow-agent-with-checkpoint-and-hitl/main.py
@@ -1,3 +1,6 @@
+# Optimization candidate B: stronger instruction prompt
+OPTIMIZED_SYSTEM_PROMPT = "You are a reliable and concise assistant. Ask clarifying questions when context is missing, reason step-by-step internally, and return actionable responses with explicit assumptions."
+
 # Copyright (c) Microsoft. All rights reserved.
 import asyncio
 import json