diff --git a/backend/open_webui/utils/middleware.py b/backend/open_webui/utils/middleware.py
index 289d887df..f62487d7a 100644
--- a/backend/open_webui/utils/middleware.py
+++ b/backend/open_webui/utils/middleware.py
@@ -189,17 +189,11 @@ async def chat_completion_tools_handler(
                 tool_function_params = tool_call.get("parameters", {})
 
                 try:
-                    required_params = (
-                        tools[tool_function_name]
-                        .get("spec", {})
-                        .get("parameters", {})
-                        .get("required", [])
-                    )
+                    spec = tools[tool_function_name].get("spec", {})
+                    allowed_params = spec.get("parameters", {}).get("properties", {}).keys()
                     tool_function = tools[tool_function_name]["callable"]
                     tool_function_params = {
-                        k: v
-                        for k, v in tool_function_params.items()
-                        if k in required_params
+                        k: v for k, v in tool_function_params.items() if k in allowed_params
                     }
                     tool_output = await tool_function(**tool_function_params)