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Ableton MCP Server

get_device_list

List devices and parameter snapshots on a specified Ableton Live track by track index, returning device path-ids for inspection.

Instructions

List devices and parameter snapshots on one track.

Side effects: none. Example: get_device_list(0) returns device path-ids. Edge cases: special tracks may expose an empty device list.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.7.0

TDQS

A3.6/5.0
Behavior4/5

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

With no annotations present the description carries the full burden, and it does disclose key traits: explicit "Side effects: none," the return format ("returns device path-ids"), and a meaningful edge case about special tracks returning empty lists. It stops short of permissions or pagination, but for a simple read tool this is solid disclosure.

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?

Four short, labeled lines that are front-loaded with the purpose and each add distinct information (side effects, example, edge cases). No filler or repetition.

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?

For a one-parameter read tool with no output schema or annotations, the description supplies the purpose, safety profile, sample return shape, and an edge case. The only gap is that the sole parameter's meaning is left partially implicit.

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 0% and the single parameter track_index is undocumented in the schema. The example "get_device_list(0)" implicitly conveys that it is a zero-based track index, but no explicit semantics, valid range, or relationship to other track identifiers is given.

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 clear verb and resource ("List devices and parameter snapshots") scoped to a single track. An agent can identify the operation, though the phrase "parameter snapshots" slightly blurs the line with the sibling list_device_params, and no sibling is named to disambiguate.

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 phrase "on one track" hints at scope, but there is no explicit when-to-use guidance, no prerequisites, and no routing to alternatives such as list_device_params, get_device_chains, or get_track_list. The agent must infer selection from the name alone.

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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