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

Annotations already confirm a safe, non-open-world, non-destructive read, and the description adds meaningful behavior beyond them: no web search, no destination verification, free during validation, and no key/credits/wallet required. The remaining opaque part is what "source and input limits" concretely are.

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 ranking/scoping sentence is front-loaded and earns its place, but "FREE during validation. No key, credits, wallet or preparation needed." restates the same reassurance twice, and "Supply your task in input" is filler that conveys nothing actionable.

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 existence of an output schema means return values need no explanation, and annotations cover the safety profile. However, for a nested single-parameter tool with zero schema descriptions, leaving the required sourceUrl and the maxLinks cap undocumented is a meaningful gap an agent must guess at.

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 0% with a nested object of four fields, so the description carries the whole burden. It only alludes to the HTML ("supplied HTML") and the query ("against a query"); the required sourceUrl and the maxLinks default/range are never mentioned, and "Supply your task in input" gives no structural guidance.

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 (rank) plus resource (real links in supplied HTML) and the output shape (direct URLs and matched words rather than a page dump). This differentiates it implicitly from extraction siblings like html_links, though it never names an alternative or clarifies the /preview counterpart.

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 search or destination verification" is a useful boundary statement implying you must already possess HTML, and "Existing source and input limits apply" hints at constraints. But there is no explicit when-to-use vs html_links or agent_utilities_link_shortlist_preview, so the routing is left to inference.

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