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 genuinely useful quota limits (~600/min/site, 2000/day/site) that the annotations do not carry, but leaves out what the inspection returns behaviorally and any auth/site-verification requirements.

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, purpose front-loaded and quota secondary, with no filler. It is efficient, though its terseness contributes to the parameter gaps noted above.

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?

The output schema exists, so return values need not be explained, but for a tool with two required string parameters and zero schema coverage the description should clarify the site_url/inspection_url relationship. As written, an agent cannot confidently populate two of three parameters from this text.

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 all three parameters; site_url, inspection_url, and language_code carry no descriptions and no enums. The description mentions only "a single URL," giving no guidance on how site_url relates to inspection_url (same property vs. arbitrary URL) or what language_code affects.

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's status"), and the word "single" quietly separates it from the sibling batch_inspect_urls. What "status" actually means (index status vs. HTTP reachability) is not specified, which keeps it from a 5.

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: "single URL" suggests using batch_inspect_urls for many URLs and this tool for one-off checks. It never names the alternative or states prerequisites, so the agent must infer routing from sibling names alone.

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