AbletonMCP

Implementation Reference

• MCP_Server/server.py:340-348 (handler)

  The handler function for the 'set_tempo' MCP tool. It retrieves the Ableton connection, sends the 'set_tempo' command with the specified tempo, and returns a confirmation message or error.

  @mcp.tool()
  def set_tempo(ctx: Context, tempo: float) -> str:
      try:
          ableton = get_ableton_connection()
          ableton.send_command("set_tempo", {"tempo": tempo})
          return f"Set tempo to {tempo} BPM"
      except Exception as e:
          logger.error(f"Error setting tempo: {str(e)}")
          return f"Error setting tempo: {str(e)}"

• MCP_Server/server.py:104-110 (helper)

  Helper logic in send_command method that identifies 'set_tempo' as a modifying command, applying extra delays and timeout for reliable execution.

  is_modifying_command = command_type in [
      "create_midi_track", "create_audio_track", "set_track_name",
      "create_clip", "add_notes_to_clip", "set_clip_name",
      "set_tempo", "fire_clip", "stop_clip", "set_device_parameter",
      "start_playback", "stop_playback", "load_instrument_or_effect",
      "load_browser_item"
  ]