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

Annotations already declare readOnly, openWorld, idempotent and non-destructive, so the safety profile is covered. The description adds two things the annotations cannot: that every returned value carries its source quote, and that page text is untrusted so results are suggestions requiring human confirmation — a genuinely useful trust/provenance caveat. It stops short of covering failure modes such as unreachable sites or rate limits.

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 short sentences, zero waste, with the return contract front-loaded and the trust caveat packaged into the second sentence. Nothing is repeated from the title or schema.

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 one parameter, no output schema and full annotation coverage, the description carries the remaining burden well: it tells the agent what comes back and how much to trust it. The gap is sibling routing and any indication of what happens when a site cannot be read, which matters for an openWorld read.

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 coverage is 100% and the single parameter already documents that it accepts a website or an App Store/Google Play link. The description adds no syntax, normalization, or URL-format detail beyond that, so the baseline 3 applies — the schema does all the parameter work.

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?

The description names a concrete resource (a website) and enumerates exactly what will be returned: owner, address, what's sold, each with supporting quotes. An agent can tell this is an extraction/read tool rather than a mutation. It does not, however, distinguish itself from the sibling check_site, which sounds like an adjacent read on the same resource.

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?

There is no explicit statement of when to reach for this tool versus check_site, read_doc, or search_docs, and no prerequisite or exclusion is given. The only routing signal is implicit in the phrase 'every value is a suggestion for the person to confirm', which hints at early-stage research rather than verified data but never says so or names the alternative.

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