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midi_quantize

Quantize MIDI note start times to a musical grid. Adjust grid spacing in seconds and snap strength (0–1) to align notes precisely to the tempo.

Instructions

Quantize notes in a MIDI item to a time grid.

Grid math: for 120 BPM, a 16th note = 0.125s, 8th = 0.25s, quarter = 0.5s. At tempo T: grid_sec = (60 / T) * (4 / divisor). For 140 BPM 16ths: (60/140) * (4/16) = 0.107s.

Args: item_index: Global item index of the MIDI item. grid_seconds: Grid spacing in seconds (see above). strength: 0.0 (no quantize) to 1.0 (hard snap). 0.5 = pull halfway.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
item_indexYes
grid_secondsYes
strengthNo
Behavior3/5

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

With no annotations, the description partially explains behavior: grid_seconds calculation and strength range. However, it does not disclose side effects (e.g., whether it modifies the item destructively, affects only selected notes, or is undoable).

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, starting with a clear one-sentence summary, followed by relevant math and parameter details. No superfluous content.

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?

While it covers purpose and parameter details, it lacks behavioral context (e.g., reversibility, scope of quantization) and does not differentiate from sibling tools like midi_humanize. Given no output schema, completeness is moderate.

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 coverage is 0%, so the description must add meaning. It provides grid math for grid_seconds, strength range (0 to 1), and clarifies item_index as a global item index. This adds significant context beyond the schema's titles.

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 verb ('Quantize') and resource ('notes in a MIDI item to a time grid'). It distinguishes itself from sibling tools like midi_humanize or midi_sort by specifying grid quantization.

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?

No guidance on when to use this tool versus alternatives like midi_humanize or when not to use it. The description lacks explicit context for tool selection.

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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