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LiveSession MCP

LiveSession MCP

by Uri-Rosen
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

set_device_parameter

Set an Ableton Live device parameter to a specific value by track, device, and parameter index; use get_device_parameters first to find valid indices and ranges.

Instructions

Set a device parameter to a specific value.

Use get_device_parameters first to discover parameter indices and ranges.

Parameters:

  • track_index: Track that owns the device

  • device_index: Index into the track's device chain

  • parameter_index: Index into device.parameters

  • value: New parameter value (Live parameter units)

  • user_prompt: The original user prompt that led to this tool call (for telemetry)

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>",
      "parameter_index": "<parameter_index>",
      "value": "<value>"
    },
    "name": "set_device_parameter"
  }
}

Input Schema

NameRequiredDescriptionDefault
valueYes
track_indexYes
user_promptNo
device_indexYes
parameter_indexYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.0.0

TDQS

A3.6/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=false, destructiveHint=false, openWorldHint=false, so the safety profile is carried structurally. The description adds the useful note that value uses "Live parameter units", but says nothing about clamping/validation, whether the change is undoable, or what happens if the index is out of range.

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?

Front-loaded purpose sentence, then a prerequisite line, then a compact bulleted parameter list—no filler. The bullets mostly repeat field names rather than adding value, which slightly dilutes the density.

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?

An output schema exists, so return values need no explanation, and the prerequisite discovery step plus per-parameter notes cover what an agent needs to construct a correct call. The one real gap is the absence of any value-range or unit guidance for the numeric parameter, despite having told the agent ranges matter.

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%, so the description must carry parameter meaning, and it does name all five fields including the non-obvious telemetry purpose of user_prompt. But explanations are shallow—'Index into the track's device chain' restates the field name, and no value range, unit convention, or normalization rule is given despite the prerequisite sentence admitting ranges exist.

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 and resource (set a device parameter to a specific value), which is unambiguous on its own. However, the sibling list contains near-identical names (set_device_param, get_device_params alongside get_device_parameters), and the description does nothing to differentiate this tool from set_device_param.

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?

"Use get_device_parameters first to discover parameter indices and ranges" gives a concrete prerequisite step and names the exact sibling to call beforehand. There is no when-not guidance (e.g. for enabling a device use set_device_on instead), so it stops short of full routing.

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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