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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful behavioral context about what is surfaced in the response—percentile, mean score, and common DNS failures—which matters because there is no output schema.

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 tool purpose and followed by concrete use cases. It does not waste space restating schema or annotations.

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 description explains return contents well, which is important because no output schema exists, and annotations cover safety traits. However, it says the tool ranks 'a domain's security score' within a 'sector or country cohort' while the schema exposes only 'format' and 'profile'—no domain, score, sector, or country input—and the description does not reconcile how the benchmark is scoped.

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 both optional parameters ('format' and 'profile') are documented in the schema with enum values and defaults, so the baseline is 3. The description does not add parameter semantics and even mentions 'sector or country cohort' without mapping that to any input parameter.

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 opens with a specific verb and resource ('Get industry benchmark data') and enumerates concrete outputs—percentile rank, mean score, and common DNS failures—so it is clearly about industry comparison rather than a domain scan. It stops short of naming or explicitly contrasting a sibling tool, so it does not reach 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?

The second sentence gives explicit trigger scenarios: comparing a score to the industry average, asking about percentile, or asking about common failures in an industry/sector. It provides no when-not conditions or named alternatives, so 4 rather than 5.

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