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reaper-mcp

reaper-mcp

by T-Rzeznik
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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reaper_add_midi_note

Insert a MIDI note at a specified pitch, start time, and duration into an existing MIDI item on any track.

Instructions

Insert a single MIDI note into an existing MIDI item on a track.

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>",
      "item_index": "<item_index>",
      "pitch": "<pitch>",
      "start_sec": "<start_sec>",
      "length_sec": "<length_sec>"
    },
    "name": "reaper_add_midi_note"
  }
}

Input Schema

NameRequiredDescriptionDefault
track_indexYes0-based track index
item_indexYes0-based item index from reaper_list_items
pitchYesMIDI note number 0-127 (60 = middle C)
start_secYesNote start in seconds (project time)
length_secYesNote duration in seconds
velocityNoNote velocity 1-127
channelNoMIDI channel 0-15

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior2/5

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

Annotations indicate the tool is not read-only, destructive, or idempotent, but the description adds no further behavioral context. It does not mention side effects (e.g., project state modification) or prerequisites (e.g., item must exist).

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?

The description is a single, clear sentence with no wasted words. It is front-loaded and easy to read, though it could benefit from structuring (e.g., bullet points) for complex tools.

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 the tool's complexity (7 parameters, no nested objects, no output schema), the description is adequate but minimal. It covers the core function but omits details like return value (none) or project state change. With good schema coverage, it is minimally sufficient.

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 100%, so the schema already documents all parameters. The description adds no extra meaning beyond what the schema provides. Baseline of 3 is appropriate.

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 action ('insert a single MIDI note') and the target ('existing MIDI item on a track'). It distinguishes from sibling tools like reaper_insert_midi_item, which likely creates a new item.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies use when adding a note to an existing MIDI item, but does not explicitly state when not to use it or mention alternatives like reaper_insert_midi_item for new items. No exclusions or context are provided.

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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