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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so safety is covered. The description adds the useful constraint that only public URLs can be audited, plus the ranked-by-severity, fix-per-finding output shape — though with an output schema present that return detail is largely redundant, and no auth, rate-limit or failure behavior is disclosed.

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?

A single front-loaded sentence: verb and scope first, then the enumerated coverage list. Dense but every clause carries information; the trailing list of six areas is slightly long but justified by the combined-audit claim.

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 one fully documented required parameter, three annotations, and an output schema, the description supplies what the structured fields do not: the audit's breadth and the fact that it is a one-call umbrella review. The only gap is the absence of any routing guidance versus the single-purpose sibling tools.

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?

The schema fully documents the single 'url' parameter at 100% coverage, so the baseline is 3. The description adds only the 'public' qualifier and re-lists the diagnostic areas already enumerated in the schema description, adding no new constraint such as format, http/https requirement, or behavior on redirects.

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?

Names a specific verb ('Audit') and resource ('one public URL') and immediately bounds the scope to six named audit areas. The phrase 'in a single call' cleanly separates it from narrow siblings like check_meta_tags, validate_schema, validate_sitemap and analyze_robots_txt, which each cover one slice.

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?

Usage is only implied: 'in a single call' hints that this is the umbrella tool and that the single-purpose siblings are subsets, but no alternative is named and no when-not-to-use condition is given. An agent could infer the routing, but it is not stated.

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