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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, but the name "add_domain" could easily be read as a write operation. The description resolves that tension head-on with "opens nothing by itself" and specifies the return value as step-by-step screens/buttons/fields. What is missing is anything about prerequisites (e.g., needing an active AccuRanker Cloud Browser session) or failure modes.

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?

The core sentence pair is front-loaded and efficient, but the trailing line — "AccuRanker's official API: AccuRanker has an official API and an official MCP server (checked 23 Oct 2026)" — is repetitive and does little to help an agent select or invoke the tool. The "from ChatGPT, Claude or any AI agent" phrase is also filler. Trimming both would sharpen the definition.

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, non-destructive helper with no output schema, the description covers the essentials: what it returns (a step-by-step procedure), that it makes no changes, and which tools to use next. Only the operational preconditions for running the follow-on browser steps are left implicit.

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 tool takes zero parameters (empty object, additionalProperties=false, 100% coverage), so there are no parameter semantics to explain and the baseline of 4 applies. Nothing in the description misleads about inputs.

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?

"Add domain in the user's own AccuRanker account" gives a clear verb+resource, and the second sentence pins down what the tool actually produces: step-by-step instructions (screens, buttons, fields) rather than performing the add. That distinction separates it from the cotlet_browser_* siblings, which do the actual interaction. The only residual ambiguity is the name itself, which implies an action the tool does not take.

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 description explicitly sequences usage: call this first to get the procedure, "then do it with the cotlet_browser_* tools in the user's AccuRanker Cloud Browser." That is a concrete when-to-use plus a named follow-on. It stops short of stating exclusions (e.g., when to skip the guide and just drive the browser), so it is not a 5.

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