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staminna

ableton-mcp-extended

by staminna

add_notes_to_clip

Add MIDI notes to an Ableton clip by providing track index, clip index, and note data. This enables programmatic composition and editing of musical notes in Live.

Instructions

Add MIDI notes to a clip.

Parameters:

  • track_index: The index of the track containing the clip

  • clip_index: The index of the clip slot containing the clip

  • notes: List of note dictionaries, each with pitch, start_time, duration, velocity, and mute

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
notesYes
clip_indexYes
track_indexYes
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states what the tool does without explaining side effects, whether notes are appended or replace existing ones, whether the clip is modified in place, or any error conditions. This leaves significant ambiguity for an agent invoking the tool.

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 concise and front-loaded. It opens with a one-sentence purpose, then lists parameters with short explanations. Every sentence adds value and there is no redundancy or wasted words. This is an efficient structure.

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

Completeness2/5

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

For a tool with no annotations and no output schema, the description is incomplete. It does not explain what happens after notes are added (e.g., return value, visual undo), any limitations (e.g., only applies to MIDI clips), or how the notes array is processed (append vs replace). Given the complexity of a MIDI editing tool, more behavioral context is needed.

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?

The schema description coverage is 0%, so the description must compensate. It does so by explaining each parameter: track_index and clip_index refer to the containing track and clip slot, and notes are described as a list of dictionaries with pitch, start_time, duration, velocity, and mute. This adds meaning beyond the schema, which only provides types. However, it lacks units or value ranges, which would further improve clarity.

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 tool's function: 'Add MIDI notes to a clip.' This is a specific verb+resource pair that distinguishes it from siblings like create_clip (creating a clip) or fire_clip (triggering playback). It is unambiguous and immediately understandable.

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 no guidance on when to use this tool versus alternatives, such as create_clip or fire_clip. It does not state prerequisites (e.g., the target clip must exist and be a MIDI clip) or situations where it should be avoided. The usage context is only implied by the tool's name and description.

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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