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

No annotations are provided, so the description carries the full disclosure burden, and it does describe the returned coverage fields in concrete terms. It does not address auth scope, pagination, or result caps for a list endpoint, which are the remaining behavioral unknowns. Still, for a zero-parameter read tool the description is unusually informative about output semantics.

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 scope and immediately followed by the when-to-use routing. It is dense but every clause carries information. The trailing coverage list is slightly list-like and could be tightened, but nothing is padding.

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?

With no output schema, the description must explain return values, and it does so explicitly (match counts, recent-seen counts, withheld notifications). Combined with the usage routing, an agent has enough to invoke it correctly. Missing only pagination/ordering details and differentiation from 'list_suppressions'.

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 (empty schema, additionalProperties false), so per the rubric the baseline is 4. The description correctly implies no filtering input is needed, but there are no parameters whose semantics could be enriched.

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 ('List the suppression rules of the caller's account') and goes on to enumerate exactly what each entry contains (match count, issues seen in last day, notifications withheld in last week). This is well beyond a tautology. It does not, however, distinguish itself from the sibling 'list_suppressions', which an agent must disambiguate on its own.

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?

Explicitly prescribes the triggering condition ('when asked why an issue is missing from a list or why a card never arrived') and the follow-up flow ('then call delete_suppression_rule with the id of the rule that explains it'), naming the sibling by name. This is as actionable as a when-to-use clause gets.

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