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

Annotations already declare readOnlyHint, destructiveHint=false, and openWorldHint, so the safety profile is covered. The description adds substantive behavior beyond that: discovery is via sitemap and links only, with no content fetching, which tells the agent the operation is lightweight and non-rendering. It omits rate limits and output shape details.

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; the purpose and its scope constraint are front-loaded and the second sentence handles usage. Zero wasted words.

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?

There is no output schema, so the description responsibly states the return is a list of URLs. Combined with full schema coverage and covering annotations, it is nearly complete, though it doesn't describe pagination/limit interaction or ordering of results.

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% and both params (url, limit) are documented in the schema itself, including the 1-5000 range. The description adds no syntax, format, or constraint detail beyond the schema, so the baseline of 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 (list) and resource (URLs on a website) and immediately clarifies the mechanism (sitemap and links) and the negative scope ('without fetching their content'). This contrasts cleanly with siblings like scrape and crawl that do fetch content.

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?

Gives a concrete when-to-use: 'see which pages exist before choosing which to scrape,' which effectively signals the scrape alternative and a discovery-first workflow. No explicit exclusions or edge cases (e.g., when to prefer search or crawl), so not a full 5.

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