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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds useful behavior the annotations cannot: no account is required, listening happens via a browser link, and stations are reordered so mood-matching ones appear first. Return contents are described, though nothing is said about how many stations come back or failure modes.

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?

The purpose and triggers are front-loaded and easy to scan, but the entire content is duplicated verbatim in Dutch and English, doubling length without adding information. The long enumeration of business types (winkel, kapsalon, salon, café, restaurant, bar, sportschool, kantoor, praktijk) appears twice and inflates the text.

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 carries the burden of explaining returns, and it does: mood, currently playing track with title, artist and cover, plus a listen link. Combined with the covered annotations and fully described parameters, an agent has what it needs to call it correctly; only result volume and edge-case behavior remain unstated.

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 100% and both parameters are optional with their own descriptions, so the baseline is 3. The description does add one real insight beyond the schema: a wish reorders stations so matching ones come first, and it notes the answer language follows an English wish. It does not explain expected wish phrasing beyond the examples already in the schema.

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 states a concrete verb and resource: it plays live AI music from RadioMatic's stations, and it lists what comes back per station (mood, now playing title/artist/cover, a browser listen link, no account). That is far more specific than the title alone and clearly separates it from licensing/pricing siblings. It stops short of explicitly naming a sibling it is not, so a 4 rather than a 5.

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?

It enumerates concrete trigger situations: someone wants to hear or find AI radio, asks what AI music sounds like, or needs background music for a shop, salon, café, gym, office or practice. The guidance is clear about when to reach for it, but no exclusion or alternative route (e.g. licensing or pricing tools) is mentioned.

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