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

Annotations already establish that this is read-only, idempotent, and non-destructive, lowering the bar. The description adds useful behavioral context by specifying what the summary contains, including that it is machine-readable and links to the binding Terms & Conditions. No hidden or surprising behavior is implied.

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 description is two sentences, front-loads the core function, and packs pricing, licence types, restrictions, and external references into a tight, readable format. Every clause contributes meaningful information with no 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?

For a zero-parameter read-only tool with no output schema, the description covers the essential return contents well: tier names, prices, licence conditions, restrictions, and links to full terms. It stops short of describing the output format or field names, but that is a minor gap given the simple, informational nature of the tool.

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 tool has zero parameters, so there is no parameter semantics for the description to add. With an empty input schema and a 100% description coverage baseline, nothing is missing; the description appropriately focuses on the output rather than inputs.

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 clearly states a specific action and resource: retrieving a machine-readable summary of the Artyfile licence tiers. It goes beyond the name by enumerating the exact contents (prices, restrictions, links), and the content obviously differentiates it from siblings like create_checkout or search_tracks.

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 description implies when to use the tool — whenever an agent needs licence terms, pricing, or Cover-Edition restrictions — but it does not explicitly state conditions, exclusions, or alternatives. Sibling tools are not referenced, so an agent must infer the appropriate context from the description alone.

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