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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds value beyond that by disclosing the payload contents (raw and PSA 10 USD prices per card) and the provenance of the set_id input, though it says nothing about result volume or how the default limit interacts with a large set.

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: use case first, prerequisite second, exclusion and alternative last. Every clause carries routing or prerequisite information, and there is 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?

An output schema exists, so return values need no elaboration, and the two required parameters are both addressed through the set_id prerequisite. For a read-only list tool with full annotation coverage, nothing an agent needs in order to call it correctly is missing.

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 50%: sort and set_id carry inline descriptions, while game is a self-evident enum and limit is bounded by default/minimum/maximum. The description reinforces the set_id provenance and the price output but adds no syntax, format, or interaction detail beyond what the schema already provides, so the baseline 3 is appropriate.

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 verb and resource — retrieving the cards in a given set along with their prices — and explicitly names the sibling tool it is not (search_cards). It also distinguishes its two primary use shapes (most valuable cards vs. full priced checklist), so an agent can separate it from get_card_prices, list_sets, and search_cards without opening a schema.

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 conditions are explicit: use it for valuable cards in a set or a priced checklist, and do not use it for a single named card — call search_cards instead. The prerequisite (a set id obtained from list_sets) is also stated, leaving nothing to inference about when to reach for this tool vs. its siblings.

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