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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds genuinely useful context beyond them: the result is public metadata only, and the call 'Costs 1 credit', which is decision-relevant for an agent. It omits any mention of the cache_max_age behavior or failure modes, keeping it short of a 5.

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?

Two tight sentences, front-loaded with the resource and then the payload, with the cost note placed last where it belongs. 'Track details.' slightly restates the title but the following clause immediately 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 no output schema, the description usefully substitutes by enumerating the return fields, and it discloses cost. The remaining gap is the undocumented cache_max_age parameter and no guidance on invalid-URL behavior, which for a simple read-only lookup is a minor omission.

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 only 50%: 'url' is documented in the schema while 'cache_max_age' is completely undocumented. The description adds no parameter meaning at all — it never mentions accepted URL forms or what cache_max_age controls — so the gap in the schema is not compensated.

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?

Names a specific resource (SoundCloud track) and enumerates the exact fields returned (plays, likes, reposts, comments, duration, genre, ISRC/label/writers), which makes it clearly a single-track lookup rather than a listing. It does not explicitly contrast itself with soundcloud_artistTracks or soundcloud_artist, but the singular scope is evident.

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 call it when you already have a track URL/slug. There is no statement about when to prefer it over soundcloud_artistTracks (enumerate an artist's tracks) or how to obtain the URL in the first place, and no exclusions or prerequisites.

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