fix: prevent duplicate MCP tools by only extending with newly added tools (#217)

Author: DeepBhupatkar

videosdk-agents/videosdk/agents/agent.py

@@ -137,9 +137,11 @@ async def initialize_mcp(self) -> None:
 
     async def add_server(self, mcp_server: MCPServiceProvider) -> None:
         """Internal Method: Initialize the MCP server and register the tools"""
+        existing_tool_count = len(self.mcp_manager.tools)
         await self.mcp_manager.add_mcp_server(mcp_server)
-        self._tools.extend(self.mcp_manager.tools)
-    
+        new_tools = self.mcp_manager.tools[existing_tool_count:]
+        self._tools.extend(new_tools)
+
     @abstractmethod
     async def on_enter(self) -> None:
         """Called when session starts, to be implemented in your custom agent implementation."""