status

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

Annotations declare readOnlyHint=false with destructiveHint=false, and the description discloses exactly why: finished downloads are filed into the library (tags normalised) as a side effect of a call that looks like a read. That is meaningful context annotations alone don't supply. It stops short of saying whether the filing is idempotent or requires any auth.

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?

Three compact sentences, front-loading scope and key outputs before the side-effect disclosure and the 'next' field note. The opening 'All playlists, or one playlist:' is a clipped fragment that reads slightly awkwardly, but no sentence is filler.

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 no output schema, the description covers what is returned (state counts, job, progress), the mutation side effect, and the guidance field well enough for correct invocation. Only edge details like pagination or job-failure reporting are absent.

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?

Schema coverage is 0% and the single parameter is only titled 'Playlist Id', but the description compensates by explaining that omitting it returns all playlists while supplying one scopes to that playlist. That resolves the optional-vs-required ambiguity the schema leaves open.

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?

The description conveys a status/inspection tool via specific outputs: counts by state, running or last job, download progress, plus the 'next' guidance field. The resource and scope ('all playlists, or one playlist') are stated, though the opening fragment is ellipted and no verb like 'report' appears. It does not differentiate itself from any sibling tool by name.

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 implied rather than stated: an agent infers it should call this to see counts/progress and that the 'next' field routes follow-up actions. There is no explicit when-not or named alternative (e.g. vs. get_music or review_candidates), so guidance stays at the implied level.

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