reaper-reapy-mcp

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create_track

Adds a new track to the REAPER project. Optionally set a name for the track to organize your mix.

Instructions

Note: Track indices in REAPER API are 0-based (first track = 0, second = 1, etc.) However, REAPER's visual interface displays tracks starting from 1. So track 0 in API = Track 1 in REAPER UI.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "create_track"
  }
}

Input Schema

Name	Required	Description	Default
`name`	No

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.4Aug 7, 2026

TDQS

D1.2/5.0

Behavior1/5

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

With no annotations, the description carries the full burden of behavioral disclosure. Instead of explaining what happens when creating a track (e.g., where it is added, return value, side effects), it only discusses index conventions. This is irrelevant to the tool's behavior and fails to disclose any operational traits.

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

Conciseness1/5

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

The text is concise in word count but entirely off-topic. It does not follow a typical tool description structure; it is a standalone note about indexing. Every sentence is wasted on irrelevant information, making it the opposite of a well-structured description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple schema (one optional name parameter) and the existence of an output schema, a complete description would explain the tool's purpose and any relevant index conventions if they apply. This description provides none of that. It is incomplete for basic understanding, let alone for proper tool selection and invocation.

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

Parameters1/5

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

The schema has one parameter 'name' with zero description coverage. The description does not mention 'name' at all, so it adds no meaning beyond the bare property name. The user cannot tell what the name parameter represents, its format, or whether it is required in practice.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description does not state what create_track does. It only provides a note about track indices in the REAPER API versus the UI, which is unrelated to the tool's purpose. There is no verb indicating creation or any resource being acted upon, making it effectively missing.

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 is provided on when to use this tool versus alternatives such as rename_track or get_track_list. The note about indexing might be tangentially related to working with tracks, but it does not explain usage context, preconditions, or selection criteria.

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