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Ableton MCP Extended

Ableton MCP Extended

by zabolotniydj
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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set_track_arm

Toggle recording readiness on any track by specifying its number and setting arm to true or false. Works for standard tracks; group and return tracks cannot be armed.

Instructions

Arm or disarm a track for recording. Group and return tracks cannot be armed.

Parameters:

  • track_index: Track number (1-based).

  • arm: True to arm, False to disarm.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "track_index": "<track_index>",
      "arm": "<arm>"
    },
    "name": "set_track_arm"
  }
}

Input Schema

NameRequiredDescriptionDefault
armYes
track_indexYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.1/5.0
Behavior3/5

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

Annotations are absent, so the description must cover behavioral traits. It discloses that group and return tracks cannot be armed and explains the arm parameter's effect, but does not mention potential side effects, error handling, or requirements beyond this constraint. Minimal but functional.

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 concise: a single lead sentence plus a two-item parameter list. No filler or irrelevant content, and the critical constraint is front-loaded.

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

Completeness4/5

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

The tool is simple with only two well-explained parameters and an output schema present, so the description need not elaborate on returns. It includes a key constraint (group/return tracks) and covers parameter semantics sufficiently, though it omits edge-case behaviors or detailed error conditions, which are not critical for this straightforward operation.

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

Parameters5/5

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

With a schema description coverage of 0%, the description fully compensates by explicitly defining each parameter: track_index as a 1-based track number and arm as a boolean toggling arm/disarm. This adds meaningful semantics beyond the basic type definitions.

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 tool 'Arm or disarm a track for recording' with a specific verb and resource, distinguishing it from sibling tools like set_track_name or set_track_volume. The scope is explicit 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 Guidelines3/5

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

The description implies usage for recording arm toggling but provides no explicit guidance on when to choose this tool over alternatives. It only notes a constraint (group/return tracks cannot be armed) without referencing when other tools might be more appropriate.

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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