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create_midi_track

Add a MIDI track to your Ableton Live session at a specified position for composing and arranging music with virtual instruments.

Instructions

Create a new MIDI track in the Ableton session.

Parameters:

  • index: The index to insert the track at (-1 = end of list)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
indexNo

Implementation Reference

  • The actual implementation of the MIDI track creation logic, interacting with the Ableton Live object model via self._song.
    def _create_midi_track(self, index):
        """Create a new MIDI track at the specified index"""
        try:
            # Create the track
            self._song.create_midi_track(index)
            
            # Get the new track
  • The MCP tool handler function which proxies the command to the Ableton remote script via _run.
    def create_midi_track(ctx: Context, index: int = -1) -> str:
        """
        Create a new MIDI track in the Ableton session.
    
        Parameters:
        - index: The index to insert the track at (-1 = end of list)
        """
        try:
            result = _run("create_midi_track", {"index": index})
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states the tool creates something, implying a write/mutation operation, but doesn't disclose important behavioral traits like: whether this requires specific permissions, what happens on failure, if the track is empty or has default settings, or how it interacts with existing tracks. The description is minimal and leaves critical behavioral aspects unspecified.

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 concise with two sentences: one stating the purpose and one explaining the single parameter. Both sentences earn their place by providing essential information without unnecessary elaboration. The structure is clear and front-loaded with the main purpose.

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?

For a mutation tool with no annotations and no output schema, the description is insufficiently complete. It doesn't explain what the tool returns (e.g., track ID, success status), what happens on errors, or important behavioral constraints. While it covers the parameter semantics adequately, it leaves too many contextual gaps for a tool that modifies the Ableton session state.

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

Parameters4/5

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

With only 1 parameter and 0% schema description coverage, the description provides meaningful semantic context that the schema lacks. It explains that 'index' represents 'The index to insert the track at' and clarifies that '-1 = end of list', which adds crucial understanding beyond the bare schema's integer type and default value.

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 track') and the target resource ('in the Ableton session'), providing a specific verb+resource combination. However, it doesn't differentiate from sibling tools like 'create_clip' or explain how this differs from other track creation operations that might exist.

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., needing an open Ableton session), when-not-to-use scenarios, or how this relates to sibling tools like 'create_clip' or 'get_track_info'.

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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