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 the upstream API identity, which is genuine context, but omits known operational traits like URL Inspection API quota limits and the fact that site must be a Search Console property the caller can access.

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 compact statements with the outcome front-loaded ahead of the API citation. The developer-docs URL is slightly bulky but justifiable provenance for a Google-backed tool.

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 usefully enumerates what comes back (index status, crawl date, canonical, blocking issue), and the two required parameters are fully documented in the schema. Only the missing usage prerequisites keep it short of full marks.

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% and the site parameter already documents accepted formats plus 'Call list_sites if unsure.' The description adds no parameter-level detail beyond the schema, so the baseline 3 applies.

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+resource with concrete return facts: whether the URL is indexed, crawl date, Google's chosen canonical, and blocking issues. An agent can distinguish this from siblings like page_check or indexing_gaps because the scope is a single URL's index status, not a page audit or a gap report.

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 implied by the described outcome (checking a specific URL's index status), but the description never says when to prefer this over page_check or indexing_gaps, nor does it state prerequisites such as needing the site verified in Search Console. Minimum-viable routing guidance.

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