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Ableton MCP Server

fire_scene

Launch a specified Session scene in Ableton Live, triggering all playable clips in that scene using the current launch quantization.

Instructions

Fire one Session scene using Live's current launch quantization.

Side effects: triggers all playable clips in the selected scene. Example: fire_scene(0) launches the first scene. Edge cases: an out-of-range index returns INVALID_PARAMS.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
scene_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.7.0

TDQS

A3.7/5.0
Behavior4/5

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

With no annotations, the description carries the full burden and largely succeeds: it discloses the side effect (triggers all playable clips in the selected scene), the timing behavior (uses current launch quantization), and the error case (out-of-range index returns INVALID_PARAMS). It omits reversibility and what happens on partially-empty scenes, keeping it short of a 5.

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?

Three tight sentences, each earning its place: purpose first, then side effects, then example and edge case. Front-loaded and scannable with no filler.

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 single-parameter action tool with no annotations and no output schema, the description covers purpose, side effects, an example, and the failure mode. Near-complete; only the acceptable index range is left 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 coverage is 0%, so the description must compensate. The example 'fire_scene(0) launches the first scene' does establish that the index is zero-based, which the bare integer schema does not convey, but range bounds and valid max are not given beyond the generic INVALID_PARAMS note.

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 (fire) plus resource (Session scene) and adds the launch-quantization qualifier, so the agent knows exactly what action occurs. It does not explicitly name the closely-related sibling fire_clip, but the resource distinction makes them separable.

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?

Usage context is implied ('one Session scene') and reinforced by a concrete example, but there is no explicit when-to-use / when-not guidance and no reference to alternatives such as fire_clip or get_scenes for discovering valid indices.

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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