Fix Anthropic tool-less usage

src/pipecat/adapters/services/anthropic_adapter.py

@@ -35,7 +35,7 @@ class AnthropicLLMInvocationParams(TypedDict):
 
     system: str | NotGiven
     messages: List[MessageParam]
-    tools: List[ToolUnionParam] | NotGiven
+    tools: List[ToolUnionParam]
 
 
 class AnthropicLLMAdapter(BaseLLMAdapter[AnthropicLLMInvocationParams]):
@@ -68,7 +68,7 @@ class AnthropicLLMAdapter(BaseLLMAdapter[AnthropicLLMInvocationParams]):
                 else messages.messages
             ),
             # NOTE: LLMContext's tools are guaranteed to be a ToolsSchema (or NOT_GIVEN)
-            "tools": self.from_standard_tools(context.tools),
+            "tools": self.from_standard_tools(context.tools) or [],
         }
 
     def get_messages_for_logging(self, context: LLMContext) -> List[Dict[str, Any]]:

src/pipecat/services/anthropic/llm.py

@@ -311,7 +311,7 @@ class AnthropicLLMService(LLMService):
         return AnthropicLLMInvocationParams(
             system=context.system,
             messages=messages,
-            tools=context.tools,
+            tools=context.tools or [],
         )
 
     @traced_llm