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

The description says the endpoint 'will provide you with the list of domains', which strongly implies a read-only retrieval operation. This contradicts the annotations, which declare destructiveHint=true and readOnlyHint=false. Per the rubric, a description that contradicts annotations scores 1.

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?

The description is two sentences, front-loaded with the core purpose and followed by a useful example. It is efficient and contains no filler, though it could be slightly more structured by separating purpose from use case.

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?

For a live API endpoint with a complex nested body and multiple optional filtering and intersection parameters, the description is thin. It does not explain authentication, cost/credit implications, or how to use the required body. An output schema exists, so return values need not be described, but the input and behavioral context remain incomplete.

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 sole top-level parameter (body) has no schema description, and the tool description adds no information about how to structure the body or use key fields such as targets, exclude_targets, or intersection_mode. Although the nested schema documents individual fields richly, the description itself does not compensate for the top-level coverage gap.

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 a specific verb and resource: it provides the list of domains pointing to specified websites. It also gives a concrete use case (Link Gap). It does not explicitly name or distinguish from the sibling page_intersection_live, so it falls 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?

The description gives a use case ('especially useful for creating a Link Gap feature'), which implies when to use it. However, it does not state when not to use it or how it differs from alternatives like page_intersection_live or competitors_live.

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