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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered by structured data. The description adds content-scope context (domain setup, search impact, fallback behavior), but never says what the tool actually returns (an article, an answer, a list of steps) or whether it takes any inputs. With annotations carrying the safety burden, a 3 is appropriate.

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 sentence covering all three facets of the content, front-loaded with the primary topic (putting the site on an owned domain). It is slightly awkward as a noun clause rather than a verb-first statement, but there is no filler or repetition.

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 zero-parameter, read-only knowledge tool with no output schema, the description conveys the subject matter an agent needs in order to dispatch it correctly. The remaining gaps — that it returns explanatory text and offers no inputs — are minor and largely inferable from the empty schema and read-only annotation.

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 has zero parameters, so there is nothing for the description to clarify; the baseline for a no-parameter tool is 4. No parameter claims in the description conflict with the empty schema.

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 topic area — connecting a Pro Site to a contractor-owned domain, its search/SEO impact, and the alternative of keeping the directory address. An agent can infer this returns explanatory content on that question, but the description never uses an explicit verb ("explain", "get", "retrieve"), so the operation type is inferred rather than stated. It also does not explicitly distinguish itself from siblings like get_pro_site or how_to_fix.

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 explicit when-to-use or when-not-to-use guidance, nor any named alternative. Usage is only implied by the topic: reach for this when a contractor asks about custom domains or SEO for their Pro Site. That implication is reasonably strong given the sibling set, but nothing routes the agent between this and get_pro_site.

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