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

Annotations already establish readOnlyHint and openWorldHint, so the safety profile is covered; the description adds value beyond them by disclosing the 200-link ceiling, the exact facets inspected (status, redirects, speed), and a paid-call cost of $0.005 USDC via x402. It does not state timeout/rate behavior or what happens when a page exceeds 200 links (truncation vs. sampling), which keeps it out of 5 territory.

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 that front-load the capability before the cost note. The middle clause is dense with parenthetical lists, but nothing is filler and the pricing disclosure earns its place.

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?

With no output schema and only three parameters, the description covers what the tool returns (broken and slow links with status/redirects/speed), the scope limit, and the cost — enough for an agent to decide and call it. The remaining gap is per-parameter meaning, which is a schema-level deficiency rather than a description one.

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%, so the description carries the full parameter burden. 'Checks up to 200 of them' implicitly maps to max_links and 'every link, image, script and stylesheet' hints at the `all` scope flag, but neither parameter is named or explained and `url` semantics (single page vs. domain) are never stated.

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 specific verb and resource ('Broken-link checker: finds every link, image, script and stylesheet on a page and checks... them') and bounds the scope with the 200-link cap and the reported fields (status, redirects, speed). It is clearly distinguishable from nearby siblings like url_metadata, scrape, site_agent_ready and seo, which do not perform link-health checking.

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 tagline 'Site QA in one call' implies the use case but never states when to reach for this instead of a crawler, screenshot, or seo tool, and gives no prerequisites or exclusions. Usage is inferable rather than explicit.

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