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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds genuine behavioral context beyond that: the data is 'confirmed' (i.e., partial and pre-launch) and full tracklists only arrive at launch, which tells the agent to expect incomplete results — a real caveat absent from the annotations.

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 tightly packed sentences with no filler; the content inventory is front-loaded and the launch-timing caveat closes it out. The dense parenthetical list is slightly heavy but every element maps to a real data attribute, so nothing is wasted.

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?

For a read-only reference lookup with full schema coverage and no output schema, the description covers content scope, what each song record carries, and the pre-launch incompleteness caveat. The only mild gap is not describing result volume or filtering behavior when 'all' is selected, which is minor for this tool type.

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% so the baseline is 3, but the description enriches the enum semantics by spelling out what each section actually contains (e.g., radio stations include genre, on-air hosts, reported voice actors, previewed songs), which goes beyond the schema's one-line enum descriptions. It also clarifies that per-song streaming links are always attached, adding value over 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 names a specific resource (GTA VI music) and enumerates its sub-parts — radio stations, album singles, Justice's score, trailer songs — so an agent knows exactly what data the tool returns. It doesn't explicitly contrast itself with siblings like get_game_info or get_news, leaving that differentiation to inference, which keeps it just short of 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?

Usage is implied rather than stated: an agent can infer this is the tool for soundtrack/music questions, but the description never says when to call it versus get_game_info or get_news, nor any exclusions. The 'Full tracklists arrive at launch' line hints at a timing caveat but isn't framed as guidance.

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