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Ableton MCP Server

set_clip_properties

Set a selected Session clip's loop start/end or name, then verify the edit in one undoable Ableton Live step.

Instructions

Set and verify selected Session clip loop bounds or name.

Side effects: changes one clip in one Live undo step. Example: set_clip_properties(0, 1, loop_end=8, name="Verse") edits a clip. Edge cases: the final loop interval must remain positive and non-empty.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNo
loop_endNo
clip_indexYes
loop_startNo
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.7.0

TDQS

B3.3/5.0
Behavior3/5

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

With no annotations, the description carries the full burden. It discloses side effects ('changes one clip in one Live undo step') and a constraint ('the final loop interval must remain positive and non-empty'), which is useful. However, it omits permissions, error behavior, and what the 'verify' process returns, leaving gaps for a mutation 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?

Four tightly written lines: purpose first, then side effects, example, and edge cases. No redundant wording; each sentence adds information.

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?

Given no annotations, no output schema, and 0% schema coverage, the description supplies side effects, an example, and an edge case, but it leaves key gaps: the meaning of 'verify' (return values), the role of loop_start, and error handling. For a 5-parameter mutation tool, it is adequate but not fully complete.

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 compensate. The example shows that track_index and clip_index are positional and that loop_end and name can be passed as keywords, but it never mentions the loop_start parameter. The edge case hints at the interaction between loop_start and loop_end but doesn't define them.

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 ('Set and verify') and resource ('Session clip loop bounds or name'), which differentiates it from siblings like set_arrangement_clip_properties and set_clip_color. The word 'selected' is slightly imprecise since the clip is identified by track_index and clip_index parameters, but the core purpose is clear.

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 an example and an edge case but offers no explicit guidance on when to choose this tool over alternatives such as set_arrangement_clip_properties or set_clip_color. Usage context is only implied through the example.

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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