Implement play_wav, record_voice, and host-side voice assistant coordinator script

mcp_server.py

@@ -228,6 +228,29 @@ class MCPServer:
                                     "volume": {"type": "integer", "description": "Volume of the tone from 0 to 100 (default 50)", "default": 50}
                                 }
                             }
+                        },
+                        {
+                            "name": "play_audio",
+                            "description": "Play a standard WAV audio file on the speaker.",
+                            "inputSchema": {
+                                "type": "object",
+                                "properties": {
+                                    "filename": {"type": "string", "description": "WAV file path to play (e.g. 'response.wav')"},
+                                    "volume": {"type": "integer", "description": "Volume from 0 to 100 (default 50)", "default": 50}
+                                },
+                                "required": ["filename"]
+                            }
+                        },
+                        {
+                            "name": "record_voice",
+                            "description": "Record voice command from the microphone to a raw stereo PCM file.",
+                            "inputSchema": {
+                                "type": "object",
+                                "properties": {
+                                    "duration_sec": {"type": "integer", "description": "Duration in seconds (default 4)", "default": 4},
+                                    "filename": {"type": "string", "description": "Destination file path (e.g. 'recording.pcm')", "default": "recording.pcm"}
+                                }
+                            }
                         }
                     ]
                 },
@@ -429,5 +452,30 @@ class MCPServer:
             play_tone(frequency=freq, duration_ms=duration, volume=vol)
             return f"Played tone of {freq}Hz for {duration}ms at volume {vol}."
             
+        elif name == "play_audio":
+            filename = str(args.get("filename"))
+            vol = int(args.get("volume", 50))
+            vol = max(0, min(100, vol))
+            
+            from audio_util import play_wav
+            success = play_wav(filename, volume=vol)
+            if success:
+                return f"Successfully played audio file '{filename}'."
+            else:
+                raise RuntimeError(f"Failed to play audio file '{filename}'. Check format (16kHz 16-bit PCM WAV recommended).")
+                
+        elif name == "record_voice":
+            duration = int(args.get("duration_sec", 4))
+            filename = str(args.get("filename", "recording.pcm"))
+            # Clamp duration to a reasonable range
+            duration = max(1, min(15, duration))
+            
+            from audio_util import record_audio
+            success = record_audio(duration_seconds=duration, filename=filename)
+            if success:
+                return f"Successfully recorded {duration} seconds of audio to '{filename}'."
+            else:
+                raise RuntimeError("Audio recording failed.")
+                
         else:
             raise ValueError(f"Unknown tool: {name}")