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

Annotations cover the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), so the bar is lower. The description still adds non-obvious behavior: the default is a dry-run preview that only commits when confirm is true, and the side effect is ownership on the signed-in Google account. It does not mention auth/scope requirements or rate limits.

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?

Three short sentences, zero filler, with the precondition and the preview/confirm behavior front-loaded where an agent will read them before the call.

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 two-parameter mutation tool with no output schema, the description covers the precondition, the side effect, and the dry-run default, which is enough to call it safely. The only gap is the exact expected shape of site_url and what the verification response reports.

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 must carry the parameter burden. It explains confirm clearly ('Previews unless confirm is true'), but site_url is only implied as 'a client's site' with no format hint (full URL, domain, protocol, or verification-type prefix), leaving ambiguity for a required string parameter.

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+resource ('Ask Google to verify ownership of a client's site') and the concrete effect ('makes the signed-in Google account a verified owner in Search Console'). It also ties itself explicitly to the sibling tool site_verification_token, so an agent can distinguish it from related Search Console tools.

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?

Gives a clear precondition for use: the token from site_verification_token must already be live on the site. It also implicitly routes the agent to the token tool first. It does not contrast against any other alternative or state when not to use it, so it falls short of a 5.

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