list_my_playlists

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

The readOnlyHint/openWorldHint annotations already establish that this is a safe, non-mutating read, so the bar is lower. The description adds one genuinely useful cross-tool fact (the 'kind' value is the playlist identifier consumed by other tools), but says nothing about ordering, result limits, or whether private/collaborative playlists are included.

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

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

A single short sentence, front-loaded with the core capability and followed by a compact parenthetical. No filler; every clause earns its place.

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

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

With zero parameters, an output schema present, and annotations covering the safety profile, the description needs little more. It is adequate for this simple listing tool, though a note on scope (own playlists only, ordering) would close the remaining gap.

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

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

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The parenthetical about 'kind' describes an output field rather than an input, which is helpful but belongs more to return-value context.

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

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

States a specific verb+resource: retrieves all of the caller's playlists. It is clearly distinguishable from track-fetching siblings like get_playlist_tracks or create_playlist, but it never names or contrasts with an alternative, so the differentiation is implicit rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: you list playlists to obtain them. The parenthetical hint that 'kind' serves as the playlist identifier for other tools faintly suggests a chaining workflow, but there is no explicit when-to-use or when-not-to-use guidance, nor any named alternative.

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