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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds two useful behavioral facts — cursor pagination and a mandatory attribution/licensing requirement — but says nothing about rate limits, error behavior, or result staleness.

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?

Purpose and pagination are front-loaded in the first two sentences, and the field list is justified because there is no output schema. The attribution block is legally necessary but long and unsplit, making the sentence structure heavier than it needs to be.

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 usefully enumerates every returned field with type and meaning, and covers pagination and licensing. What is missing is sibling disambiguation against domains_expiring/domains_dropped, which matters for a 10-parameter read tool in this dense catalogue.

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%, so all 10 filter parameters are already documented. The description repeats the same field names and only adds interpretive value for score ('higher is shorter, cleaner and closer to real words'), which is a return field, not a parameter. Baseline 3 applies.

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 concrete resource and scope: domains about to be released, enriched with a value score. It never names the closely related siblings (domains_expiring, domains_dropped, domains_new), so the agent must infer the boundary itself, which keeps this from 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?

Usage is implied rather than stated: the score and word/compound/trademark fields signal this is for finding registerable, high-quality domains, and release_at/days_left imply a registration window. There is no explicit when-to-use, no exclusions, and no routing to domains_expiring or domains_dropped.

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