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

Beyond the read-only, idempotent, and non-destructive annotations, the description usefully discloses credit consumption: a base charge plus per-card and include-related charges. The billing shorthand is somewhat ambiguous for mixed card and sealed-product requests, and other behavior such as price freshness or currency is not explained.

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 compact sentences front-load the capability, item limit, supported product types, and cost without filler. The phrase '+1 per card and include' is overly compressed and makes the otherwise efficient billing statement harder to parse.

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?

Together with the fully described schema and safety annotations, the description provides enough information for a basic invocation, including item limits and billing. With no output schema and many price-related siblings, it remains incomplete about the summary contents and when this comparison tool is preferable to the single-product or other summary tools.

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 description coverage is 100%, and it already documents the ID limit, sealed prefix with an example, and include options. The description mostly repeats that information and adds little parameter meaning beyond associating include usage with additional cost.

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 the resource and operation: side-by-side price summaries for up to 10 cards and sealed products, including the sealed ID prefix. It does not explicitly distinguish the tool from overlapping siblings such as price_summary, get_card_prices, or get_sealed_prices.

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?

Side-by-side summaries and the 10-item limit imply that this is for comparing multiple cards or sealed products. There is no explicit when-to-use guidance, exclusion, or direction to a sibling for single-item, detailed, or historical prices.

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