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

Annotations already declare read-only, idempotent, open-world, and non-destructive, so the safety profile is covered. The description adds genuine value by disclosing what a call returns (status, XML validity, URL count) and the implicit /sitemap.xml fallback, which is not captured in the schema. It does not cover error behavior or nested sitemap indexes.

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?

One sentence, front-loaded with the action and resource, then the return payload. No filler or repetition of the tool name.

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 single-parameter read tool with no output schema, the description adequately covers both input (URL/hostname with fallback) and output (status, XML validity, URL count). Minor gaps remain around failure modes and sitemap-index handling, but nothing essential for a correct call is missing.

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 the schema already explains the URL/hostname forms, so the baseline is 3. The description adds the fallback semantics ('or the host's /sitemap.xml'), which tells the agent the parameter can resolve to a default path beyond the literal input.

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 pair (fetch/report) and resource (sitemap), plus the concrete outputs: status, XML validity, and URL count. The resource name separates it from siblings like check_robots or check_tls, 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?

No when-to-use guidance, no conditions for choosing this over stillindexed_check_url or stillindexed_check_robots, and no prerequisites. The only hint is the fallback to the host's /sitemap.xml, which is input behavior rather than usage guidance.

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