Implement stream-based download_file tool for downloading media files directly to flash or SD card

mcp_server.py

@@ -263,6 +263,19 @@ class MCPServer:
                                 },
                                 "required": ["wav_base64"]
                             }
+                        },
+                        {
+                            "name": "download_file",
+                            "description": "Download a file from a URL over Wi-Fi directly to the board storage or microSD card.",
+                            "inputSchema": {
+                                "type": "object",
+                                "properties": {
+                                    "url": {"type": "string", "description": "The URL of the file to download"},
+                                    "filename": {"type": "string", "description": "The destination filename (e.g. 'podcast1.wav')"},
+                                    "use_sd": {"type": "boolean", "description": "Save to microSD card if true, or local flash if false (default true)", "default": True}
+                                },
+                                "required": ["url", "filename"]
+                            }
                         }
                     ]
                 },
@@ -522,5 +535,17 @@ class MCPServer:
             else:
                 raise RuntimeError("Failed to play decoded audio stream. Check format (16kHz 16-bit PCM WAV recommended).")
                 
+        elif name == "download_file":
+            url = str(args.get("url"))
+            filename = str(args.get("filename"))
+            use_sd = bool(args.get("use_sd", True))
+            
+            from download_util import download_file
+            saved_path = download_file(url, filename, use_sd=use_sd)
+            if saved_path:
+                return f"Successfully downloaded file to '{saved_path}'."
+            else:
+                raise RuntimeError(f"Failed to download file from '{url}'.")
+                
         else:
             raise ValueError(f"Unknown tool: {name}")