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create_clip

Create a new MIDI clip in Ableton Live by specifying track and clip slot indices, with customizable length for music production.

Instructions

Create a new MIDI clip in the specified track and clip slot.

Parameters:

  • track_index: The index of the track to create the clip in

  • clip_index: The index of the clip slot to create the clip in

  • length: The length of the clip in beats (default: 4.0)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
track_indexYes
clip_indexYes
lengthNo

Implementation Reference

  • The actual Ableton Live API implementation for creating a clip in a specific track/slot.
    def _create_clip(self, track_index, clip_index, length):
        """Create a new MIDI clip in the specified track and clip slot"""
        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]
            
            # Check if the clip slot already has a clip
            if clip_slot.has_clip:
                raise Exception("Clip slot already has a clip")
            
            # Create the clip
            clip_slot.create_clip(length)
  • The MCP tool handler for create_clip, which invokes the command in the Remote Script.
    def create_clip(ctx: Context, track_index: int, clip_index: int,
                    length: float = 4.0) -> str:
        """
        Create a new MIDI clip in the specified track and clip slot.
    
        Parameters:
        - track_index: The index of the track to create the clip in
        - clip_index: The index of the clip slot to create the clip in
        - length: The length of the clip in beats (default: 4.0)
        """
        try:
            _run("create_clip", {
                "track_index": track_index,
                "clip_index": clip_index,
                "length": length
            })
            return f"Created clip at track {track_index}, slot {clip_index} ({length} beats)"
        except Exception as e:
            return f"Error creating clip: {e}"
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It states the tool creates a clip, implying a write operation, but doesn't disclose behavioral traits like whether it overwrites existing clips, requires specific permissions, has side effects (e.g., on playback), or error handling. The description adds minimal context beyond the basic action.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is appropriately sized and front-loaded: the first sentence states the core purpose, followed by a parameter list. Each sentence earns its place, with no redundant or vague phrasing. Minor improvement could come from integrating parameter details more seamlessly.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations, 0% schema coverage, and no output schema, the description is incomplete. It covers the basic action and parameters but lacks critical context for a mutation tool: no error cases, no output details, no permissions or side effects. This leaves the agent under-informed for reliable use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It lists all three parameters with brief explanations (e.g., 'index of the track', 'length in beats'), adding meaning beyond the schema's bare types. However, it doesn't clarify constraints (e.g., valid index ranges, beat units) or interactions (e.g., how length affects clip behavior), leaving gaps.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Create a new MIDI clip') and specifies the target resources ('in the specified track and clip slot'). It distinguishes from siblings like 'add_notes_to_clip' (modifies existing clips) and 'create_midi_track' (creates tracks, not clips). However, it doesn't explicitly differentiate from all siblings (e.g., 'fire_clip' triggers playback).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., whether the track must exist), exclusions (e.g., what happens if the clip slot is occupied), or contextual cues (e.g., use this to prepare for adding notes). The agent must infer usage from the purpose alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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