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set_track_monitor

Set a REAPER track's input monitoring mode to off, normal, or not while playing by specifying the track index and monitor value.

Instructions

Set the monitor mode for a track.

Args: monitor: 0=off, 1=normal, 2=not when playing.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
monitorYes
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.7.3

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations, the description carries the full behavioral burden. It implies a mutation but discloses nothing about required permissions, whether the change is reversible, whether it applies live during playback/recording, or what happens on an invalid track index.

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?

Two short lines, front-loaded with the action and immediately followed by the mode mapping. Minor waste from the raw docstring 'Args:' formatting, but no verbosity.

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?

For a two-parameter mutation tool with no annotations and no output schema, the mode semantics are adequately covered, but the description omits what track_index addresses (index vs. selected track), error behavior, and any note on applying it during playback.

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% and the monitor parameter has no enum in the schema, so the description's value mapping (0=off, 1=normal, 2=not when playing) is essential and cannot be obtained anywhere else. track_index is left unexplained, but its name makes the intent self-evident.

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 and resource ('Set the monitor mode for a track'), so an agent can tell it apart from neighboring track setters like set_track_volume or set_track_mute by the resource it mutates. It does not explicitly name or contrast any sibling, but the scope is unambiguous.

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 when-to-use context, prerequisites, or alternatives are given. The description never says when a track needs monitoring set, or how this interacts with record/arm or playback state, leaving the agent to infer usage entirely.

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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