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create_midi_track

Add a new MIDI track to an Ableton Live session at a chosen insert position, or append it to the end of the track list.

Instructions

Create a new MIDI track.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
indexNo0-indexed track insert position, or -1 for end of list

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.8/5.0
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 behavioral burden. 'Create' implies a mutation, but nothing is said about required permissions, whether the new track is auto-armed or selected, side effects on existing tracks, or the returned handle — a significant gap for a mutation tool with zero annotation coverage.

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

Conciseness3/5

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

The single sentence is front-loaded and waste-free, but it is essentially the tool name restated, so its brevity reflects under-specification rather than disciplined concision.

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 1-parameter mutation tool with no annotations and no output schema, the description omits behavior an agent needs: insertion semantics when index is omitted, effect on the session/track list, and any confirmation of what is created beyond the bare action.

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 100%, so the lone 'index' parameter (0-indexed insert position, -1 for end) is fully documented in the schema. The description adds nothing beyond that, which is the expected baseline when the schema does the work.

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?

States a specific verb and resource ('Create a new MIDI track'), which is unambiguous about the operation. It does not, however, distinguish itself from siblings that also create objects (create_clip) or explain how it relates to get_track_structure / set_track_name.

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?

There is no guidance on when to use this over alternatives, no prerequisites, and no mention of what happens when the track list is already populated. An agent must infer everything from the name and the single parameter.

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