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AbletonMCP

AbletonMCP

by juampicosta
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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set_parameter_by_index

Set a device parameter value using its numeric index. First list parameters to find the correct index and valid range.

Instructions

Set a device parameter value by its index. Use list_parameters first to find the right index and valid range.

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>",
      "device_index": "<device_index>",
      "param_index": "<param_index>",
      "value": "<value>"
    },
    "name": "set_parameter_by_index"
  }
}

Input Schema

NameRequiredDescriptionDefault
track_indexYes
device_indexYes
param_indexYes
valueYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A3.6/5.0
Behavior2/5

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

No annotations are provided, so the description must bear the full burden. It only states 'Set', implying mutation, but does not disclose any side effects, authorization needs, or behavior beyond the basic operation. The existence of an output schema is not mentioned.

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 two sentences, front-loaded with the purpose, and wastes no words. It is appropriately sized for the tool's simplicity.

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?

The description covers the basic purpose and prerequisite, but given the 4 required parameters and the fact that an output schema exists (but is not referenced), it lacks completeness on what the tool returns or additional behavioral context. Adequate but has clear gaps.

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 description coverage is 0%, but the description adds no explanation for the four parameters. The parameter names (track_index, device_index, param_index, value) are somewhat self-explanatory, but the description does not add any additional meaning, such as formats, ranges, or dependencies.

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 action ('Set a device parameter value') and the method ('by its index'), and distinguishes from the sibling tool 'set_parameter_by_name' which uses a name instead.

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 explicit guidance: 'Use list_parameters first to find the right index and valid range.' This helps the agent prepare, but it does not explicitly state when NOT to use this tool (e.g., when a name is known).

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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