AbletonMCP

Instructions

Implementation Reference

• MCP_Server/server.py:440-458 (handler)

  MCP tool handler for 'fire_clip' that proxies the command to the Ableton remote script via socket connection.

  @mcp.tool()
  def fire_clip(ctx: Context, track_index: int, clip_index: int) -> str:
      """
      Start playing a clip.
      
      Parameters:
      - track_index: The index of the track containing the clip
      - clip_index: The index of the clip slot containing the clip
      """
      try:
          ableton = get_ableton_connection()
          result = ableton.send_command("fire_clip", {
              "track_index": track_index,
              "clip_index": clip_index
          })
          return f"Started playing clip at track {track_index}, slot {clip_index}"
      except Exception as e:
          logger.error(f"Error firing clip: {str(e)}")
          return f"Error firing clip: {str(e)}"

• AbletonMCP_Remote_Script/__init__.py:564-588 (helper)

  Actual Ableton Live API implementation that fires the clip slot using Live's Python API.

  def _fire_clip(self, track_index, clip_index):
      """Fire a clip"""
      try:
          if track_index < 0 or track_index >= len(self._song.tracks):
              raise IndexError("Track index out of range")
          
          track = self._song.tracks[track_index]
          
          if clip_index < 0 or clip_index >= len(track.clip_slots):
              raise IndexError("Clip index out of range")
          
          clip_slot = track.clip_slots[clip_index]
          
          if not clip_slot.has_clip:
              raise Exception("No clip in slot")
          
          clip_slot.fire()
          
          result = {
              "fired": True
          }
          return result
      except Exception as e:
          self.log_message("Error firing clip: " + str(e))
          raise

• AbletonMCP_Remote_Script/__init__.py:265-268 (helper)

  Dispatching logic in remote script that routes 'fire_clip' command to the _fire_clip handler.

  elif command_type == "fire_clip":
      track_index = params.get("track_index", 0)
      clip_index = params.get("clip_index", 0)
      result = self._fire_clip(track_index, clip_index)

• MCP_Server/server.py:104-107 (registration)

  'fire_clip' listed as a state-modifying command in AbletonConnection.send_command for special handling (delays).

  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",