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

The description's 'no external research or outbound actions' and 'Returns a draft for human review' directly contradict the annotations openWorldHint=true, readOnlyHint=false, and destructiveHint=true. This is a clear annotation contradiction, warranting a score of 1 regardless of any other useful behavioral details.

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 about 60 words and front-loaded with the core action, followed by constraints, pricing, and payment authorization—all necessary for safe invocation. There is no filler or redundant restatement, making it appropriately concise.

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?

Given 5 parameters, a nested input object, no output schema, and 0% schema coverage, the description fails to clarify parameter semantics and contradicts the annotations. The agent lacks essential information about expected inputs and behavioral side effects, making the definition incomplete.

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 compensate, but it only mentions 'buyer-supplied information' without explaining the input object's brief/audience/source_text semantics or the roles of payment_signature, idempotency_key, and result_expires. This is a critical gap for a tool with 5 parameters.

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 states a clear verb ('Produce') and resource ('distinct advertising concepts') with the output components (headline, body, CTA, rationale) listed, which distinguishes it from generic copy tools. It does not explicitly differentiate from close siblings like headline_variants or social_posts, so it stops short of a 5.

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 provides context—buyer-supplied information only, no external research or outbound actions—which implies a boundary, but it does not explicitly say when to use this tool versus alternatives. No sibling tools are mentioned, making selection guidance minimal.

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