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

Annotations already declare readOnly/idempotent/non-destructive/openWorldHint=false, so the safety profile is covered. The description adds genuinely useful context beyond them: no cost, no website is fetched (external network is not touched), and the answer's scope including both language variants of the links.

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?

Front-loaded with the purpose, then a tight parenthetical listing of what the answer contains; every clause carries information. It is a single fairly long run-on sentence, which costs it the top mark.

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 and a trivially simple one-param input, the description tells the agent what the returned content covers (measurements, limits, links) and what it does not do (fetch a website). Only the shape of the return (prose vs structured) is left unspecified.

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?

Single optional 'language' parameter with 100% schema coverage, so the schema already documents the en/et enum and default. The description only echoes this indirectly ('English and Estonian links') and adds no new syntax or behavior beyond the structured data, making 3 the correct baseline.

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 ('Describes the free QQQ AI Visibility Checker') and then enumerates the exact subject matter the answer covers (measurements, limits, links). The closing 'no website is fetched' implicitly separates it from the sibling check_ai_visibility, which an agent can act on without opening either schema.

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 only implied: the tool reads as the orientation/meta entry point before or instead of running an actual audit, and 'no cost, no website is fetched' hints at when it is the cheaper option. It never names check_ai_visibility or states an explicit condition for choosing one over the other.

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