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

The description frames the tool purely as a read that 'will provide you with Whois data,' while annotations declare readOnlyHint=false and destructiveHint=true. An agent reading the description would infer a safe lookup, so the description and the structured safety metadata give conflicting signals (it also says nothing about billing/cost, which is the likely real reason for the destructive hint).

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, cleanly front-loaded with the core purpose. The second sentence ('Using this endpoint you will be able to get all these data...') merely restates the first and could be dropped without information loss.

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 not be explained, and the live-endpoint nature is implied by the name. Still missing for a credit-consuming POST endpoint are cost/billing implications, pagination expectations for large result sets, and any hint about the type of query/filters accepted, all of which an agent would need to call it confidently.

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 reported as 0% (only the top-level body array is exposed as a parameter), so the description is the only chance to explain inputs, and it instead defers entirely with 'the parameters you specify in the request.' Filters, limit/offset, order_by, and offset_token are never mentioned, so no compensation for the coverage gap occurs.

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 names a specific resource (Whois data for domains) and enumerates the enrichment fields returned (backlink stats, ranking and traffic from organic and paid search), so an agent knows what the endpoint yields. It does not, however, distinguish this tool from its many domains_* siblings (e.g., get_dataforseo_domains_whois_available_filters or the tech_* live endpoints), which is the difference between a 4 and 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?

No guidance on when to use this live endpoint versus setup/filter endpoints such as get_dataforseo_domains_whois_available_filters or batch_use, and no prerequisites are stated. The only usage statement is the tautological 'for the domains matching the parameters you specify in the request,' which tells the agent nothing about selection.

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