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

The description claims 'no external research or outbound actions' while the annotations set openWorldHint=true and destructiveHint=true, which implies external side effects. The description also mentions payment requiring wallet authorization, which is an outbound action. This directly contradicts the annotation and the description's own later statement, making the behavioral model inconsistent.

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 description is compact: three sentences, with the primary action and deliverable front-loaded. The second and third sentences add important constraints and cost/authorization details without excessive padding. However, the misleading 'no outbound actions' claim introduces a structural inconsistency that costs it a perfect score.

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?

The tool has nested objects, no output schema, and 0% parameter coverage. The description gives only a minimal view of output ('draft for human review') and omits how to construct the required 'input' object or what the expected return structure looks like. It does disclose price and authorization, which is useful, but an agent would still lack enough information to populate the parameters correctly or anticipate the full response.

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% and the description adds no parameter-level detail. It does not explain 'input', 'brief', 'audience', 'source_text', or the signature/expiry fields. The phrase 'buyer-supplied information' vaguely maps to the brief/audience/source_text, but no actual parameter names or requirements are mentioned, so the description fails to compensate for the absent schema documentation.

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 opens with a concrete action: 'Draft a focused landing page' and lists the key sections (hero, benefits, evidence placeholders, objections, CTA). This clearly distinguishes it from siblings like homepage_copy, ad_copy, or value_proposition by naming the specific deliverable and its components.

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 gives context: uses buyer-supplied information only, no external research, returns a draft for human review. It implies the tool is appropriate when the buyer has provided sufficient information and wants a draft, but it does not explicitly name alternatives or state when not to use this tool versus, say, homepage_copy or service_page_copy.

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