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

No annotations are supplied, so the description carries the full burden. It does disclose meaningful behavior beyond a bare label: the capped 50-URL sample and the hreflang reciprocity check are concrete scope limits that an agent would not otherwise know. It does not state whether the tool is strictly read-only, what happens when no sitemap is found, or what the response looks like.

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 primary verb and resource, then the secondary checks in a compact list. No filler or restated title. The run-on accumulation of four clauses costs it a perfect score but nothing is wasted.

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?

This is a moderately complex multi-check tool with no annotations and no output schema, so the description should explain more of the return shape and edge cases. It covers all four checks performed, which is adequate, but omits failure modes (missing sitemap, unreachable URLs) and result structure.

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?

There is a single parameter with full schema coverage, so the schema already documents that 'domain' takes something like example.com. The description adds no further meaning about accepted formats, subdomain handling, or URL-vs-domain input, so it sits at the baseline.

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?

The description names a concrete resource (a domain's sitemaps) and enumerates four specific operations: discovery, URL counting, sampling up to 50 URLs for status, and hreflang reciprocity. That clearly separates it from siblings like validate_schema or test_robots. It stops short of explicitly contrasting itself with a broader audit tool such as run_free_audit, which may also touch sitemaps.

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?

There is no when-to-use guidance, no stated prerequisites (e.g., whether the domain must already declare a sitemap in robots.txt), and no named alternative for overlapping needs like run_free_audit. The agent must infer the use case purely from the enumerated checks.

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