artist_singles_timeline

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

With no annotations, the description carries the full burden and discloses genuinely valuable traits: the underlying implementation (one paginated /artists/{id}/albums walk), the scope filter (singles group), the cost tier (🟡), and the output shape (date · title · track count). The rate-limit/cost disclosure is exactly the context the rubric credits. It omits edge behaviors like reissue handling or pagination semantics, but the core behavioral profile is transparent.

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 with zero filler: the first front-loads the core behavior, the second packs cost and implementation detail. The '45-rpm history' metaphor earns its place by making the deliverable instantly recognizable.

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 tool with no annotations and no output schema, the description conveys the core deliverable, scope, and quota but stops short of covering max_results semantics, response_format behavior, or edge cases (empty catalogs, invalid artist IDs). Adequate for the common path, incomplete for the full call contract.

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 schema documents artist_id and response_format well, but max_results has no description in either the schema or the tool description, so an agent cannot know it caps the result set. The tool description contributes zero parameter meaning and does not compensate for the 33% schema coverage gap. Neither source explains the one non-obvious parameter.

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 specific deliverable: a chronological singles timeline showing date, title, and track count, with the vivid '45-rpm history in one table' metaphor reinforcing the scope. The singles-only scope distinguishes it from the discography-wide artist_discography_timeline and from the plain listing implied by get_artist_singles.

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?

The use case is implied — a historical, one-table view of an artist's singles — but no alternatives are named and no when-to-use versus when-not-to-use guidance is given. Close siblings like get_artist_singles and artist_discography_timeline exist, yet the description never routes the agent between them. The quota note hints at cost but not at selection logic.

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