Update prompt templates to use simpler format

app.py

@@ -22,9 +22,36 @@ model = HfApiModel(
     token=hf_token,
 )
 
-with open("prompts.yaml", 'r') as stream:
-    prompt_templates = yaml.safe_load(stream)
-    
+# Define prompt templates directly in the code
+prompt_templates = {
+    "system": """You are a helpful AI assistant that can use tools to solve problems.
+You have access to the following tools:
+{{tools}}
+
+When you want to use a tool, use this format:
+```python
+get_weather(location="New York")
+```
+or
+```python
+duck_duck_go_search(query="latest news about artificial intelligence")
+```
+
+When you have a final answer, use:
+```python
+final_answer("Your detailed response here")
+```""",
+    "user": "{{query}}",
+    "tool_response": """The result of your tool call was:
+{{observation}}
+
+What would you like to do next?""",
+    "final_answer": {
+        "pre_messages": "Please provide your final answer.",
+        "post_messages": "Let me know if you have any other questions!"
+    }
+}
+
 # We're creating our CodeAgent with multiple tools
 agent = CodeAgent(
     model=model,