diff --git a/flo_ai/flo_ai/llm/anthropic_llm.py b/flo_ai/flo_ai/llm/anthropic_llm.py
index 05c45cf1..aa3e9c2f 100644
--- a/flo_ai/flo_ai/llm/anthropic_llm.py
+++ b/flo_ai/flo_ai/llm/anthropic_llm.py
@@ -95,6 +95,11 @@ def format_tool_for_llm(self, tool: 'Tool') -> Dict[str, Any]:
                     name: {
                         'type': info.get('type', 'string'),
                         'description': info.get('description', ''),
+                        **(
+                            {'items': info['items']}
+                            if info.get('type') == 'array' and 'items' in info
+                            else {}
+                        ),
                     }
                     for name, info in tool.parameters.items()
                 },
diff --git a/flo_ai/flo_ai/llm/gemini_llm.py b/flo_ai/flo_ai/llm/gemini_llm.py
index 6b3f2550..55885659 100644
--- a/flo_ai/flo_ai/llm/gemini_llm.py
+++ b/flo_ai/flo_ai/llm/gemini_llm.py
@@ -106,6 +106,11 @@ def format_tool_for_llm(self, tool: 'Tool') -> Dict[str, Any]:
                     name: {
                         'type': info.get('type', 'string'),
                         'description': info.get('description', ''),
+                        **(
+                            {'items': info['items']}
+                            if info.get('type') == 'array' and 'items' in info
+                            else {}
+                        ),
                     }
                     for name, info in tool.parameters.items()
                 },
diff --git a/flo_ai/flo_ai/llm/ollama_llm.py b/flo_ai/flo_ai/llm/ollama_llm.py
index 01dfc320..d4e12602 100644
--- a/flo_ai/flo_ai/llm/ollama_llm.py
+++ b/flo_ai/flo_ai/llm/ollama_llm.py
@@ -82,6 +82,11 @@ def format_tool_for_llm(self, tool: 'Tool') -> Dict[str, Any]:
                     name: {
                         'type': info.get('type', 'string'),
                         'description': info.get('description', ''),
+                        **(
+                            {'items': info['items']}
+                            if info.get('type') == 'array' and 'items' in info
+                            else {}
+                        ),
                     }
                     for name, info in tool.parameters.items()
                 },
diff --git a/flo_ai/flo_ai/llm/openai_llm.py b/flo_ai/flo_ai/llm/openai_llm.py
index 6c823bb3..383ed916 100644
--- a/flo_ai/flo_ai/llm/openai_llm.py
+++ b/flo_ai/flo_ai/llm/openai_llm.py
@@ -80,7 +80,15 @@ def format_tool_for_llm(self, tool: 'Tool') -> Dict[str, Any]:
             'parameters': {
                 'type': 'object',
                 'properties': {
-                    name: {'type': info['type'], 'description': info['description']}
+                    name: {
+                        'type': info['type'],
+                        'description': info['description'],
+                        **(
+                            {'items': info['items']}
+                            if info.get('type') == 'array' and 'items' in info
+                            else {}
+                        ),
+                    }
                     for name, info in tool.parameters.items()
                 },
                 'required': list(tool.parameters.keys()),
diff --git a/flo_ai/flo_ai/models/agent.py b/flo_ai/flo_ai/models/agent.py
index 22f8b526..a3b78b26 100644
--- a/flo_ai/flo_ai/models/agent.py
+++ b/flo_ai/flo_ai/models/agent.py
@@ -210,7 +210,10 @@ async def _run_with_tools(
                     # Execute the tool
                     try:
                         function_name = function_call['name']
-                        function_args = json.loads(function_call['arguments'])
+                        if isinstance(function_call['arguments'], str):
+                            function_args = json.loads(function_call['arguments'])
+                        else:
+                            function_args = function_call['arguments']
 
                         tool = self.tools_dict[function_name]
                         function_response = await tool.execute(**function_args)