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fire_clip

Start playing a specific clip in Ableton Live by specifying the track and clip index numbers for music production control.

Instructions

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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
track_indexYes
clip_indexYes

Implementation Reference

  • The actual logic that fires the clip in Ableton Live.
    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
            }
  • The MCP tool definition and handler that triggers the remote script execution.
    @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:
            _run("fire_clip", {"track_index": track_index, "clip_index": clip_index})
            return f"Playing clip at track {track_index}, slot {clip_index}"
        except Exception as e:
Behavior2/5

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

With no annotations, the description carries full burden but provides minimal behavioral context. It states the action ('Start playing') but doesn't disclose what happens if indices are invalid, whether playback is immediate or queued, if it overrides other playback, or what the expected outcome is. For a mutation tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

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

Conciseness5/5

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

The description is extremely concise and front-loaded: the first sentence states the purpose clearly, followed by a bulleted list of parameters. There is no wasted text, and every sentence earns its place by providing essential information efficiently.

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 the tool's complexity (a mutation action with 2 parameters), no annotations, no output schema, and low schema coverage (0%), the description is incomplete. It lacks details on behavior, error conditions, prerequisites, and how it interacts with sibling tools (e.g., 'stop_clip'). For a tool that initiates playback, more context is needed to use it effectively.

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?

The description lists parameters and their roles (track_index for track, clip_index for clip slot), adding meaning beyond the schema which has 0% description coverage and only titles. However, it doesn't explain index ranges (e.g., zero-based?), what constitutes a valid clip, or how to determine these indices from other tools. It partially compensates for low schema coverage but not fully.

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 ('Start playing a clip') and identifies the resource (a clip). It distinguishes from siblings like 'stop_clip' (which stops playback) and 'create_clip' (which creates new clips). However, it doesn't specify what type of clip (audio, MIDI, etc.) or playback context, making it slightly less specific than ideal.

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?

No guidance is provided on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., whether a clip must exist at the indices), differentiate from 'start_playback' (which might start overall session playback), or indicate when not to use it (e.g., if a clip is already playing). The description only states what it does, not when to apply it.

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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