AbletonMCP

by juampicosta

Overview Schema Source Related Servers Discussions Admin

Python

Local

set_loop

Enable or disable a loop and set its start and length in bars to define playback range.

Instructions

Enable/disable loop and optionally set loop start and length in bars.

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": {
      "enabled": "<enabled>"
    },
    "name": "set_loop"
  }
}

Input Schema

Name	Required	Description	Default
`enabled`	Yes
`start_bars`	No
`length_bars`	No

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Jun 14, 2026

TDQS

C2.9/5.0

Behavior2/5

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

No annotations provided, and the description lacks behavioral details. It does not mention effects on playback, constraints on parameters, or whether start/length are ignored when disabled. Minimal beyond the schema.

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?

Single sentence with no fluff. Front-loaded with action and resource, then optional parameters. Highly concise and efficient.

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

Completeness3/5

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

Tool is simple (3 params, output schema exists). Description covers basic functionality but lacks details on parameter interactions (e.g., start/length only matter when enabled) or edge cases. Adequate but not fully complete.

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

Parameters2/5

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

Schema coverage is 0%, so description must compensate. It adds 'in bars' for start and length, but does not explain units explicitly, constraints, mutual dependencies, or behavior when enabled=false. Minimal value added.

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?

Description clearly states the tool enables/disables loop and optionally sets start/length in bars. It uniquely identifies the action on a specific resource, distinguishing it from sibling tools like set_tempo or set_metronome.

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?

No guidance on when to use this tool versus alternatives, or any context about prerequisites or scenarios. The description only states what it does, not when to use it.

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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