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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so safety is covered. The description adds genuinely new behavior: it performs a live network fetch and returns anchor text, rel attribute values (nofollow/sponsored/ugc) and a dofollow verdict. It stops short of disclosing failure modes (unreachable page, timeouts, redirects) or how multiple matching links are handled.

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?

A single sentence that front-loads the action and then the reported fields; every clause carries distinct information and there is no filler or repetition of the title.

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 only two parameters and no output schema, the description's job is to convey what comes back, and it does – anchor text, rel tokens, dofollow status. It is slightly thin on negative outcomes (no link found, page blocked/unreachable) which matter for a live-fetch tool.

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 both 'url' and 'targetDomain' are already documented with format and example. The description restates them at a high level ('a page', 'target domain') without adding matching rules, subdomain handling, or normalization semantics. Baseline 3 is appropriate.

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 ('fetch a page and confirm whether it contains a link to the target domain') plus the exact outputs ('anchor text and rel attributes... whether the link is dofollow'). No sibling (check_page_history, find_mentions, find_competitor_link_sources) does live link verification, so the scope is unambiguous without explicit comparison.

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 by the description – an agent can infer this is for backlink verification, but there is no statement of when to prefer it over find_mentions or find_competitor_link_sources, and no mention of prerequisites or cost (live fetch per call).

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