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 returned data categories, which is useful given there is no output schema, but it does not explain the notable idempotentHint=false (results change over time as GSC data updates) or any rate/permission constraints.

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 tight sentences with the resource and scope front-loaded and no filler. It could drop the partially redundant second sentence ('Checks if the URL is indexed...') which restates the first.

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?

For a read-only inspection tool with full schema coverage and no output schema, the description does enough: it names the resource, the required inputs, and the broad shape of the return. What is missing is any tie-in to the adjacent tools (batch_inspect) that would help an agent route 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 coverage is 100%, so site_id, url, and the concise/detailed 'detail' toggle are fully documented in the schema itself. The description adds no syntax, format, or default information beyond that, 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 and resource ('Inspect a single URL') and enumerates the data domains it covers (indexing status, crawl info, GSC data). The word 'single' implicitly distinguishes it from the sibling batch_inspect, though no sibling is named explicitly.

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 'single URL' — an agent can infer this is for one-off checks rather than bulk work, but the description never states when to prefer this over batch_inspect or get_index_status, nor any preconditions (e.g. the site must be connected to GSC).

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