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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds real value beyond that: 24h caching, and that force_refresh=true triggers a live paid fetch (~$0.05/call), which also explains the idempotentHint=false. It stops short of describing rate limits or failure modes.

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?

Two dense sentences with zero filler: the return payload comes first, the shaping options second, and the cache/cost caveat last. Every clause earns its place.

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 carries the return-value burden and does so by naming the three payload shapes (summary, anchors, per-link rows with toxicity scores). Combined with annotations covering safety and the description covering caching and cost, an agent has everything needed to call it correctly.

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 the schema already documents every parameter including enum-like values for risk, sort, view and detail, plus the force_refresh cost. The description restates the filter/sort/page/rollup behaviors and the default page size but adds no format or syntax detail the schema lacks. Baseline 3 is appropriate when the schema does the heavy lifting.

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?

Specific verb ('Get') plus resource ('a site's backlink profile'), and it enumerates the concrete payload (referring domains, dofollow ratio, risk breakdown, top anchors, per-link detail with toxicity scores). An agent can tell this apart from sibling profile tools like get_brand_profile or domain_keyword_profile without opening the 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?

The description explains how to shape the call ('Filter by risk, sort, page with offset, or roll up by referring domain') and when a paid live fetch is triggered, which is genuinely useful. However it never states when to prefer this tool over alternatives such as download_disavow_file or get_competitive_landscape, nor any exclusions, so usage guidance is implied rather than explicit.

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