list_emulators

Instructions

Implementation Reference

• puppeteer.py:238-331 (handler)

  The handler function decorated with @mcp.tool() that implements the list_emulators tool. It uses ADB to list connected devices/emulators, fetches additional info like AVD name/model and screen dimensions, and returns a structured list.

  @mcp.tool()
  async def list_emulators() -> dict:
      """List all available Android emulators and devices with their name, ID, status, and dimensions"""
      try:
          # Execute adb devices to get connected devices/emulators
          result = subprocess.run(['adb', 'devices'], capture_output=True, text=True, check=True)
  
          devices = []
          lines = result.stdout.strip().split('\n')[1:]  # Skip header line
  
          for line in lines:
              if line.strip():
                  parts = line.strip().split('\t')
                  if len(parts) >= 2:
                      device_id = parts[0]
                      status = parts[1]
  
                      # Try to get AVD name if it's an emulator
                      avd_name = "Unknown"
                      if device_id.startswith('emulator-'):
                          try:
                              avd_result = subprocess.run(
                                  ['adb', '-s', device_id, 'emu', 'avd', 'name'],
                                  capture_output=True, text=True, timeout=5
                              )
                              if avd_result.returncode == 0:
                                  avd_name = avd_result.stdout.strip()
                          except (subprocess.TimeoutExpired, subprocess.CalledProcessError):
                              pass
                      else:
                          # For physical devices, try to get device model
                          try:
                              model_result = subprocess.run(
                                  ['adb', '-s', device_id, 'shell', 'getprop', 'ro.product.model'],
                                  capture_output=True, text=True, timeout=5
                              )
                              if model_result.returncode == 0:
                                  avd_name = model_result.stdout.strip()
                          except (subprocess.TimeoutExpired, subprocess.CalledProcessError):
                              pass
  
                      # Get device dimensions
                      width, height, dimensions = None, None, None
                      try:
                          size_result = subprocess.run(
                              ['adb', '-s', device_id, 'shell', 'wm', 'size'],
                              capture_output=True, text=True, timeout=5
                          )
                          if size_result.returncode == 0:
                              output = size_result.stdout.strip()
                              if 'Physical size:' in output:
                                  size_part = output.split('Physical size:')[1].strip()
                                  width, height = map(int, size_part.split('x'))
                                  dimensions = f"{width}x{height}"
                      except (subprocess.TimeoutExpired, subprocess.CalledProcessError, ValueError):
                          pass
  
                      devices.append({
                          "id": device_id,
                          "name": avd_name,
                          "status": status,
                          "type": "emulator" if device_id.startswith('emulator-') else "device",
                          "width": width,
                          "height": height,
                          "dimensions": dimensions
                      })
  
          return {
              "success": True,
              "devices": devices,
              "count": len(devices)
          }
  
      except subprocess.CalledProcessError as e:
          return {
              "success": False,
              "error": f"Failed to execute adb command: {e}",
              "devices": [],
              "count": 0
          }
      except FileNotFoundError:
          return {
              "success": False,
              "error": "ADB not found. Please ensure Android SDK is installed and adb is in PATH.",
              "devices": [],
              "count": 0
          }
      except Exception as e:
          return {
              "success": False,
              "error": f"Unexpected error: {e}",
              "devices": [],
              "count": 0
          }

• puppeteer.py:238-238 (registration)

  The @mcp.tool() decorator registers the list_emulators function as an MCP tool.

  @mcp.tool()