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configure_midi_input

Set a REAPER track's MIDI input device and channel, then arm for recording and enable monitoring, returning readback for verification.

Instructions

Set a track's MIDI input, record arm and monitoring; return readback.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
armNo
trackNoExact track name (case-insensitive).
deviceNo
channelNo0 all, 1..16 specific
dry_runNoPreview: return what would run without changing the project.
fx_guidNo
monitorNo
fx_indexNo
fx_scopeNo
track_containsNoCase-insensitive substring; errors if it matches more than one track.
fx_name_containsNo
target_track_guidNoStable REAPER track GUID; preferred when available.
use_selected_trackNoTarget the currently selected track instead of naming one.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden, yet it only notes that a readback is returned. It never states that this mutates the project, what happens to unmentioned settings, whether dry_run previews changes, or any permission/auth requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single front-loaded sentence with no wasted words, but for a 13-parameter tool it is arguably undersized rather than genuinely concise. Efficiency is high; sufficiency is not.

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?

A complex 13-param mutation tool with no annotations, no output schema, and 46% schema coverage needs considerably more description than one sentence. Key gaps remain around targeting logic, dry_run behavior, and the FX-related parameters.

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

Parameters2/5

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

Schema description coverage is only 46% across 13 parameters, and the description names just three concepts (input/device-channel, arm, monitor) that map loosely to a few params. The numerous FX-related and targeting parameters (fx_guid, fx_scope, fx_index, target_track_guid, etc.) receive no semantic explanation in either place.

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') plus three concrete resources (MIDI input, record arm, monitoring) and notes the readback return. An agent can tell it apart from the read-oriented sibling get_midi_inputs, though the description never names that sibling explicitly.

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 versus alternatives such as track, get_midi_inputs, or link_fx_midi_cc, and no prerequisites or preconditions are stated. The 'return readback' phrase hints at a verify workflow but is not framed as usage guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.