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

Annotations already declare read-only, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds real value beyond that: the verified-property auth requirement, the exact fields returned, and an explicit capability boundary (no reindexing possible via any tool here). It does not mention rate limits or failure modes (e.g., URL not in property).

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 opening sentence is tight and front-loaded. The second paragraph is longer than the tool description itself and is largely about a workflow (requesting reindexing) that this tool explicitly does not perform, so its weight is disproportionate to the tool's actual function.

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 an output schema present, return values need not be described, and the description covers purpose, prerequisite, and capability limits. The gap is parameter format guidance against 0% schema coverage and the absence of any sibling routing note.

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% for both parameters, so the description must compensate. It adds meaning for site_url (must be a verified property) but says nothing about page_url's expected format (full URL with scheme, must belong to the property) or whether site_url is a domain or URL-prefix property.

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 first sentence gives a specific verb and resource (inspects a URL's Google index status) and enumerates exactly what comes back: indexed state, last crawl, robots/indexing state, canonical, mobile usability, rich results. It does not, however, disambiguate from the very close sibling gsc_inspect_urls, leaving the agent to guess which one to pick.

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?

It states the prerequisite (site_url must be a verified property) and explicitly rules out a closely adjacent goal, reindexing, with concrete alternatives (resubmit sitemap with real lastmod, internal links, manual button ~10/day). That is strong negative guidance, though it never says when to choose this over gsc_inspect_urls or the broader seo_* inspection tools.

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