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 and read-only profile is covered without description help. The description adds only the purpose-level claim about indexing status; it does not mention rate limits, what happens when some URLs fail, or that idempotentHint=false means repeat calls may return different results.

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 first, differentiation second, and every clause carries information. Nothing is repeated from the schema or the title.

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, three-parameter inspection tool with full schema coverage and annotations covering safety, the description covers what the tool does and when it beats the alternative. The remaining gap is return-shape and partial-failure behavior, which is modest given the absence of an output schema and the low complexity.

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%, so the meaning of site_id, urls and detail (including the concise/detailed behavior) is fully documented in the schema. The description adds no parameter-level semantics beyond the schema, which is exactly the baseline 3 case.

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 (inspect), resource (multiple URLs), and outcome (indexing status and issues), so the agent knows exactly what it gets back. It implicitly separates itself from the single-URL sibling by contrasting with 'inspecting one at a time', though it never names inspect_url or get_url_inspections outright.

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?

The phrase 'More efficient than inspecting one at a time' gives an implied usage rule (use this when you have several URLs), which is better than nothing. However, it never names the alternative tool (inspect_url) or states the boundary conditions — e.g. that a single URL should go elsewhere, or that batches are capped at 50 (that constraint only lives in the schema).

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