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jamiew

SoundCloud MCP Server

Add tracks to playlist

add_tracks_to_playlist

Append selected tracks to your existing SoundCloud playlist by providing the playlist ID and an array of track IDs.

Instructions

Append tracks to an existing playlist

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
trackIdsYes
playlistIdYes
Behavior2/5

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

Annotations already indicate mutation (readOnlyHint=false) and possible side effects (openWorldHint=true). Description only says 'Append tracks', adding no new behavioral details like idempotency or what happens on duplicate tracks.

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 sentence with six words is very concise, but underspecification reduces value. Lacks necessary detail for a 2-parameter tool.

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?

No output schema and description omits return behavior, error cases, or preconditions. Incomplete for a mutation tool with 2 required parameters.

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?

Schema coverage is 0% and description does not explain trackIds or playlistId semantics. Description only restates the tool's action without clarifying parameter purposes, such as required format or constraints.

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?

Description clearly states verb 'Append' and resource 'tracks to an existing playlist', distinguishing it from sibling tools like remove_track_from_playlist and create_playlist.

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 tool versus alternatives, such as update_playlist which might replace tracks entirely. No mention of prerequisites like playlist existence.

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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