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ableton12-mcp

ableton12-mcp

by verove-jordan
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

create_midi_track

Add a new MIDI track to your Ableton Live session. Use an index to insert at a position, or -1 to append; re-read session info to get the actual index.

Instructions

Create a new MIDI track. index=-1 appends at the end. Re-read get_session_info afterwards to learn the real new index.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "create_midi_track"
  }
}

Input Schema

NameRequiredDescriptionDefault
indexNo

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.0

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations, the description carries the full burden. It discloses a non-obvious behavioral trait: the supplied index may not be final, so the caller must re-read get_session_info to learn the actual index. This is useful behavioral context beyond the schema, though it does not cover permissions or error conditions.

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?

Two sentences, front-loaded with the primary purpose, and a follow-up instruction. Every word earns its place; no fluff.

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

Completeness5/5

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

The tool has a single simple parameter and an output schema, so the description is complete. It explains the index behavior and provides a cross-reference to get_session_info, making it self-sufficient for an agent to invoke correctly.

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?

Schema description coverage is 0%, so the description must explain parameters. It explains that index=-1 appends at the end, giving meaning to the integer parameter beyond the schema's default. It does not explain other values, but the key special value is covered.

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

Purpose5/5

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

The description clearly states the verb 'Create' and the resource 'new MIDI track', distinguishing it from sibling tools like create_audio_track and create_return_track by specifying the track type. It is specific and unambiguous.

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

Usage Guidelines4/5

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

The description provides clear context by explaining the index=-1 default behavior (append at end) and instructs the agent to re-read get_session_info to discover the real index, implying a verification step. However, it does not explicitly mention when not to use it or name alternatives.

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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