diff --git a/swarms/structs/__init__.py b/swarms/structs/__init__.py
index 7b99e637..e6383155 100644
--- a/swarms/structs/__init__.py
+++ b/swarms/structs/__init__.py
@@ -100,6 +100,7 @@ from swarms.structs.swarming_architectures import (
     staircase_swarm,
     star_swarm,
 )
+from swarms.structs.aop import AOP
 
 __all__ = [
     "Agent",
@@ -184,4 +185,5 @@ __all__ = [
     "check_end",
     "AgentLoader",
     "BatchedGridWorkflow",
+    "AOP",
 ]
diff --git a/swarms/structs/aop.py b/swarms/structs/aop.py
index fbb21f19..d04b956e 100644
--- a/swarms/structs/aop.py
+++ b/swarms/structs/aop.py
@@ -983,21 +983,23 @@ class AOP:
             port: Port to bind the server to
         """
         logger.info(
-            f"Starting MCP server '{self.server_name}' on {self.host}:{self.port}"
+            f"Starting MCP server '{self.server_name}' on {self.host}:{self.port}\n"
+            f"Transport: {self.transport}\n"
+            f"Log level: {self.log_level}\n"
+            f"Verbose mode: {self.verbose}\n"
+            f"Traceback enabled: {self.traceback_enabled}\n"
+            f"Available tools: {self.list_agents()}"
         )
-        logger.info(f"Transport: {self.transport}")
-        logger.info(f"Log level: {self.log_level}")
-        logger.info(f"Verbose mode: {self.verbose}")
-        logger.info(f"Traceback enabled: {self.traceback_enabled}")
-        logger.info(f"Available tools: {self.list_agents()}")
 
         if self.verbose:
-            logger.debug("Server configuration:")
-            logger.debug(f"  - Server name: {self.server_name}")
-            logger.debug(f"  - Host: {self.host}")
-            logger.debug(f"  - Port: {self.port}")
-            logger.debug(f"  - Transport: {self.transport}")
-            logger.debug(f"  - Total agents: {len(self.agents)}")
+            logger.debug(
+                "Server configuration:\n"
+                f"  - Server name: {self.server_name}\n"
+                f"  - Host: {self.host}\n"
+                f"  - Port: {self.port}\n"
+                f"  - Transport: {self.transport}\n"
+                f"  - Total agents: {len(self.agents)}"
+            )
             for tool_name, config in self.tool_configs.items():
                 logger.debug(
                     f"  - Tool '{tool_name}': timeout={config.timeout}s, verbose={config.verbose}, traceback={config.traceback_enabled}"
@@ -1005,12 +1007,12 @@ class AOP:
 
         self.mcp_server.run(transport=self.transport)
 
-        # Note: FastMCP doesn't have a direct start method in the current implementation
-        # This would need to be implemented based on the specific MCP server setup
-        print(
+        logger.info(
             f"MCP Server '{self.server_name}' is ready with {len(self.agents)} tools"
         )
-        print(f"Tools available: {', '.join(self.list_agents())}")
+        logger.info(
+            f"Tools available: {', '.join(self.list_agents())}"
+        )
 
     def run(self) -> None:
         """
diff --git a/swarms/tools/base_tool.py b/swarms/tools/base_tool.py
index af08f11e..24d71b40 100644
--- a/swarms/tools/base_tool.py
+++ b/swarms/tools/base_tool.py
@@ -231,9 +231,10 @@ class BaseTool(BaseModel):
     def base_model_to_dict(
         self,
         pydantic_type: type[BaseModel],
+        output_str: bool = False,
         *args: Any,
         **kwargs: Any,
-    ) -> dict[str, Any]:
+    ) -> Union[dict[str, Any], str]:
         """
         Convert a Pydantic BaseModel to OpenAI function calling schema dictionary.
 
@@ -247,7 +248,7 @@ class BaseTool(BaseModel):
             **kwargs: Additional keyword arguments
 
         Returns:
-            dict[str, Any]: OpenAI function calling schema dictionary
+            Union[dict[str, Any], str]: OpenAI function calling schema dictionary or JSON string
 
         Raises:
             ToolValidationError: If pydantic_type validation fails
@@ -278,9 +279,13 @@ class BaseTool(BaseModel):
 
             # Get the base function schema
             base_result = base_model_to_openai_function(
-                pydantic_type, *args, **kwargs
+                pydantic_type, output_str=output_str, *args, **kwargs
             )
 
+            # If output_str is True, return the string directly
+            if output_str and isinstance(base_result, str):
+                return base_result
+
             # Extract the function definition from the functions array
             if (
                 "functions" in base_result
@@ -314,8 +319,8 @@ class BaseTool(BaseModel):
             ) from e
 
     def multi_base_models_to_dict(
-        self, base_models: List[BaseModel]
-    ) -> dict[str, Any]:
+        self, base_models: List[BaseModel], output_str: bool = False
+    ) -> Union[dict[str, Any], str]:
         """
         Convert multiple Pydantic BaseModels to OpenAI function calling schema.
 
@@ -323,12 +328,11 @@ class BaseTool(BaseModel):
         a unified OpenAI function calling schema format.
 
         Args:
-            return_str (bool): Whether to return string format
-            *args: Additional positional arguments
-            **kwargs: Additional keyword arguments
+            base_models (List[BaseModel]): List of Pydantic models to convert
+            output_str (bool): Whether to return string format. Defaults to False.
 
         Returns:
-            dict[str, Any]: Combined OpenAI function calling schema
+            dict[str, Any] or str: Combined OpenAI function calling schema or JSON string
 
         Raises:
             ToolValidationError: If base_models validation fails
@@ -344,10 +348,18 @@ class BaseTool(BaseModel):
             )
 
         try:
-            return [
-                self.base_model_to_dict(model)
+            results = [
+                self.base_model_to_dict(model, output_str=output_str)
                 for model in base_models
             ]
+
+            # If output_str is True, return the string directly
+            if output_str:
+                import json
+
+                return json.dumps(results, indent=2)
+
+            return results
         except Exception as e:
             self._log_if_verbose(
                 "error", f"Failed to convert multiple models: {e}"
diff --git a/swarms/tools/pydantic_to_json.py b/swarms/tools/pydantic_to_json.py
index ae8b6a44..0efb060b 100644
--- a/swarms/tools/pydantic_to_json.py
+++ b/swarms/tools/pydantic_to_json.py
@@ -39,12 +39,14 @@ def check_pydantic_name(pydantic_type: type[BaseModel]) -> str:
 
 def base_model_to_openai_function(
     pydantic_type: type[BaseModel],
+    output_str: bool = False,
 ) -> dict[str, Any]:
     """
     Convert a Pydantic model to a dictionary representation of functions.
 
     Args:
         pydantic_type (type[BaseModel]): The Pydantic model type to convert.
+        output_str (bool): Whether to return string output format. Defaults to False.
 
     Returns:
         dict[str, Any]: A dictionary representation of the functions.
@@ -85,7 +87,7 @@ def base_model_to_openai_function(
     _remove_a_key(parameters, "title")
     _remove_a_key(parameters, "additionalProperties")
 
-    return {
+    result = {
         "function_call": {
             "name": name,
         },
@@ -98,6 +100,14 @@ def base_model_to_openai_function(
         ],
     }
 
+    # Handle output_str parameter
+    if output_str:
+        import json
+
+        return json.dumps(result, indent=2)
+
+    return result
+
 
 def multi_base_model_to_openai_function(
     pydantic_types: List[BaseModel] = None,
@@ -114,13 +124,21 @@ def multi_base_model_to_openai_function(
 
     """
     functions: list[dict[str, Any]] = [
-        base_model_to_openai_function(pydantic_type, output_str)[
-            "functions"
-        ][0]
+        base_model_to_openai_function(
+            pydantic_type, output_str=False
+        )["functions"][0]
         for pydantic_type in pydantic_types
     ]
 
-    return {
+    result = {
         "function_call": "auto",
         "functions": functions,
     }
+
+    # Handle output_str parameter
+    if output_str:
+        import json
+
+        return json.dumps(result, indent=2)
+
+    return result
diff --git a/tests/utils/test_output_str_fix.py b/tests/utils/test_output_str_fix.py
new file mode 100644
index 00000000..27882567
--- /dev/null
+++ b/tests/utils/test_output_str_fix.py
@@ -0,0 +1,150 @@
+from pydantic import BaseModel
+from swarms.tools.pydantic_to_json import (
+    base_model_to_openai_function,
+    multi_base_model_to_openai_function,
+)
+from swarms.tools.base_tool import BaseTool
+
+
+# Test Pydantic model
+class TestModel(BaseModel):
+    """A test model for validation."""
+
+    name: str
+    age: int
+    email: str = "test@example.com"
+
+
+def test_base_model_to_openai_function():
+    """Test that base_model_to_openai_function accepts output_str parameter."""
+    print(
+        "Testing base_model_to_openai_function with output_str=False..."
+    )
+    result_dict = base_model_to_openai_function(
+        TestModel, output_str=False
+    )
+    print(f"✓ Dict result type: {type(result_dict)}")
+    print(f"✓ Dict result keys: {list(result_dict.keys())}")
+
+    print(
+        "\nTesting base_model_to_openai_function with output_str=True..."
+    )
+    result_str = base_model_to_openai_function(
+        TestModel, output_str=True
+    )
+    print(f"✓ String result type: {type(result_str)}")
+    print(f"✓ String result preview: {result_str[:100]}...")
+
+
+def test_multi_base_model_to_openai_function():
+    """Test that multi_base_model_to_openai_function handles output_str correctly."""
+    print(
+        "\nTesting multi_base_model_to_openai_function with output_str=False..."
+    )
+    result_dict = multi_base_model_to_openai_function(
+        [TestModel], output_str=False
+    )
+    print(f"✓ Dict result type: {type(result_dict)}")
+    print(f"✓ Dict result keys: {list(result_dict.keys())}")
+
+    print(
+        "\nTesting multi_base_model_to_openai_function with output_str=True..."
+    )
+    result_str = multi_base_model_to_openai_function(
+        [TestModel], output_str=True
+    )
+    print(f"✓ String result type: {type(result_str)}")
+    print(f"✓ String result preview: {result_str[:100]}...")
+
+
+def test_base_tool_methods():
+    """Test that BaseTool methods handle output_str parameter correctly."""
+    print(
+        "\nTesting BaseTool.base_model_to_dict with output_str=False..."
+    )
+    tool = BaseTool()
+    result_dict = tool.base_model_to_dict(TestModel, output_str=False)
+    print(f"✓ Dict result type: {type(result_dict)}")
+    print(f"✓ Dict result keys: {list(result_dict.keys())}")
+
+    print(
+        "\nTesting BaseTool.base_model_to_dict with output_str=True..."
+    )
+    result_str = tool.base_model_to_dict(TestModel, output_str=True)
+    print(f"✓ String result type: {type(result_str)}")
+    print(f"✓ String result preview: {result_str[:100]}...")
+
+    print(
+        "\nTesting BaseTool.multi_base_models_to_dict with output_str=False..."
+    )
+    result_dict = tool.multi_base_models_to_dict(
+        [TestModel], output_str=False
+    )
+    print(f"✓ Dict result type: {type(result_dict)}")
+    print(f"✓ Dict result length: {len(result_dict)}")
+
+    print(
+        "\nTesting BaseTool.multi_base_models_to_dict with output_str=True..."
+    )
+    result_str = tool.multi_base_models_to_dict(
+        [TestModel], output_str=True
+    )
+    print(f"✓ String result type: {type(result_str)}")
+    print(f"✓ String result preview: {result_str[:100]}...")
+
+
+def test_agent_integration():
+    """Test that the Agent class can use the fixed methods without errors."""
+    print("\nTesting Agent integration...")
+    try:
+        from swarms import Agent
+
+        # Create a simple agent with a tool schema
+        agent = Agent(
+            model_name="gpt-4o-mini",
+            tool_schema=TestModel,
+            max_loops=1,
+            verbose=True,
+        )
+
+        # This should not raise an error anymore
+        agent.handle_tool_schema_ops()
+        print(
+            "✓ Agent.handle_tool_schema_ops() completed successfully"
+        )
+
+    except Exception as e:
+        print(f"✗ Agent integration failed: {e}")
+        return False
+
+    return True
+
+
+if __name__ == "__main__":
+    print("=" * 60)
+    print("Testing output_str parameter fix")
+    print("=" * 60)
+
+    try:
+        test_base_model_to_openai_function()
+        test_multi_base_model_to_openai_function()
+        test_base_tool_methods()
+
+        if test_agent_integration():
+            print("\n" + "=" * 60)
+            print(
+                "✅ All tests passed! The output_str parameter fix is working correctly."
+            )
+            print("=" * 60)
+        else:
+            print("\n" + "=" * 60)
+            print(
+                "❌ Some tests failed. Please check the implementation."
+            )
+            print("=" * 60)
+
+    except Exception as e:
+        print(f"\n❌ Test failed with error: {e}")
+        import traceback
+
+        traceback.print_exc()