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

With no annotations provided, the description must carry the behavioral burden. It discloses the output contents (today's price, most valuable cards, total market value), which is the core behavior for a read-only pricing tool. It does not mention limitations, freshness, or error behavior, but for this simple query tool the disclosure is adequate though not rich.

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 concise sentences with no filler. The first sentence front-loads what the tool returns, and the second adds the essential parameter provenance. Every sentence earns its place.

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?

The tool is simple (one required parameter), and an output schema exists, so return details do not need to be in the description. The description covers what the tool returns and where group_id comes from. Minor gaps remain around when to choose this tool over sibling pricing tools, but nothing essential for a correct call 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 coverage is 0%, so the description must compensate. It does add meaning by explaining that group_id is a set id and that it comes from search results. However, it does not provide format details, examples, or a range, so it only partially compensates for the absent schema description.

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 that the tool returns every card in a set with today's price, the most valuable cards, and the set's total market value. This is a clear resource and output scope, and 'set ids come from search results' clarifies the input domain. It does not explicitly name a sibling to differentiate from, so it falls 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?

It provides useful contextual guidance: set ids come from search results (group_id), which tells an agent how to obtain the required parameter. However, it does not state when to prefer set_prices over alternatives like card_price or most_valuable, nor does it give any exclusions.

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