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

Annotations cover the safety profile (non-read-only, open-world, non-idempotent), and the description adds genuinely useful execution context: synchronous, returns the result inline. It also discloses the output shape (score plus critical/warning issues plus fixes), which annotations do not. It doesn't explain why the audit isn't read-only or whether it persists state.

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 with zero padding; the capability and its scope are front-loaded and the synchronous-return caveat follows logically.

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, the description usefully describes the return (score, critical/warning issues, fixes) and the sync behavior. It is nearly complete for a single-URL tool, with only the sync-vs-poll routing against get_audit_result left unstated.

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 100%, so both 'url' and the optional 'site_id' are already documented in the schema, including a concrete example. The description adds nothing about parameter formats or the purpose of site_id, so the baseline 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 ('Run') and resource ('SEO audit on any URL') with scope detail ('40+ point'). The '40+ point full audit' framing implies an aggregate check versus the granular check_* siblings, but no sibling is named explicitly, so differentiation is inferential rather than stated.

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 through the phrase 'Runs synchronously and returns the result directly', which hints this is a blocking call rather than something to poll via get_audit_result. It never states when to choose this over the individual check_* tools or the get_page_score/get_site_score alternatives.

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