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arm_track

Arm or disarm a track in REAPER to control which track receives recording input.

Instructions

Arm or disarm a track for recording.

Args: arm: True to arm, False to disarm.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
armNo
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.7.3

TDQS

C2.9/5.0
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 burden. It conveys the toggle semantics but says nothing about whether arming is required before record, whether it persists, whether it affects existing input monitoring, or whether disarming mid-record fails — meaningful gaps for a state-changing DAW operation.

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 sentences, front-loaded with the tool's action. The Args block is somewhat redundant-formatted but adds the only real semantic value present, so it earns its place.

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 toggle with no annotations and no output schema, the definition is minimally adequate. It omits track_index meaning and any return/state information, so an agent knows the gist but not the full call contract.

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. It does clarify the boolean 'arm' (True = arm, False = disarm), which is genuinely useful, but leaves the required 'track_index' completely unexplained — the more important parameter for correct invocation.

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+resource pair ('Arm or disarm a track') and scopes it to recording, which distinguishes it from the mute/solo siblings. It does not explicitly contrast with arm_track_envelope, but the object 'track' (not envelope) is a reasonable implicit differentiator.

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 arm vs. disarm beyond the parameter flag, no prerequisites (e.g. recording enabled, record-arm mode), and no mention of related siblings like record or set_track_input. The agent must infer the workflow context 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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