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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive, so the description rightly spends its words elsewhere: it discloses that the listing is public, requires no API key, excludes agents that never completed a test, and shows only the latest run's score. It doesn't mention pagination or result-set size, which is a minor gap for a listing tool.

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 sentences, front-loaded with the resource and followed by the returned fields and eligibility rule. The parenthetical enumeration of the three test types is slightly verbose but clarifies the completeness rule, so it 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?

There is no output schema, so the description carries the burden of describing return values, and it does: latest score, number of checks, and last-tested time. Combined with the eligibility rule and the no-key note, an agent has enough to decide to call it and interpret results; only ordering/pagination is unspecified.

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 takes zero parameters, so there is nothing to disambiguate; the baseline of 4 applies. The description correctly spends no space on inputs and instead describes what the listing contains.

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?

States a specific verb and resource ('Read the public ProveCart Verified Agent scoreboard') and immediately narrows scope to 'every agent that has completed a test', listing the three test types. An agent can tell this is a public read of published results, distinct from the sibling action tools (exam_start, selftest, register).

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?

Implies usage (view published scores after an agent is tested) but never says when to call this versus alternatives, notably the sibling provecart_certification_info or provecart_check_* tools. No explicit when-not guidance, so selection relies on inference from the name and sibling names.

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