Ableton MCP Extended

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add_wavetable_mod_target

Make a parameter a modulation target in Wavetable's matrix. Specify track, device, chain, and parameter indices to expose device parameters as automatable.

Instructions

Make a parameter a modulation target in Wavetable's matrix.

Reports which device parameters appeared as a result, which shows whether the matrix amounts become ordinary automatable parameters.

Parameters:

track_index: Track number (1-based).
parameter_name: Target parameter name (or use parameter_index).
parameter_index: Target parameter number (1-based).
device_index: Device number on the track (1-based).
chain_index: Chain number inside a rack (1-based, 0 = not in a rack).

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>"
    },
    "name": "add_wavetable_mod_target"
  }
}

Input Schema

Name	Required	Description	Default
`chain_index`	No
`track_index`	Yes
`device_index`	No
`parameter_name`	No
`parameter_index`	No

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Aug 21, 2026

TDQS

B3.4/5.0

Behavior3/5

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

With no annotations provided, the description carries the behavioral transparency burden. It does add useful post-condition information by reporting which device parameters appear afterward and whether matrix amounts become automatable parameters. However, it does not disclose side effects, error cases, or reversibility for this mutating operation, so transparency is partial.

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 compact and well organized: one purpose sentence, one result-explanation sentence, and a clear bulleted parameter list. Every sentence adds value without unnecessary repetition or filler.

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 core purpose, parameter details, and a hint about the return value, which makes invocation feasible. However, for a 5-parameter mutation tool with no annotations, it lacks usage alternatives, prerequisites, and edge-case behavior, so completeness is only adequate.

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

Parameters4/5

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

Schema description coverage is 0%, so the description must compensate, and it does: it documents all five parameters with 1-based semantics, clarifies parameter_name can be used instead of parameter_index, and explains chain_index 0 means not in a rack. It lacks some detail about precedence when both parameter_name and parameter_index are supplied, but it is substantially helpful.

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?

The description clearly states the action: making a parameter a modulation target in Wavetable's matrix. It identifies the exact resource and operation, but it does not explicitly differentiate itself from similar sibling tools like set_wavetable_modulation or set_wavetable_property, so it stops short of full sibling differentiation.

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 description provides parameter-selection guidance (parameter_name or parameter_index) but no guidance on when to use this tool versus alternatives, when not to use it, or any prerequisites such as requiring a Wavetable device to be loaded. This leaves usage context largely implied.

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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