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

The description contradicts the annotation openWorldHint=true by stating 'no external research or outbound actions.' This is a direct contradiction, forcing a score of 1 per the rules. While the description does add valuable behavioral details (draft output, payment requirement), the contradiction undermines trust and clarity.

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 concise, with only three sentences, and front-loads the core purpose. It includes essential pricing and payment authorization info without excess. It is well-structured, though it could be slightly more organized around behavior and parameters.

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?

With five parameters, a nested object, no output schema, and no parameter descriptions, the description is incomplete. It does not explain the input structure, the meaning of result_expires, idempotency_key, result_signature, or payment_signature. It does clarify the output is a draft for human review, which helps, but the missing parameter semantics and the contradiction with openWorldHint leave significant gaps for correct invocation.

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 by explaining parameters. It does not mention any of the five parameters (input object, result_expires, idempotency_key, result_signature, payment_signature) or how they relate to the task. The mention of 'supplied text', 'audience', and 'tone' only implicitly maps to the input object's properties, but nothing is explicit. This leaves the agent without meaning for critical fields like idempotency_key or payment_signature.

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, specific action: adapting supplied text to a requested audience and tone while preserving factual constraints. It distinguishes itself from the many sibling writing tools by focusing on tone/audience adaptation and explicitly notes it returns a draft for human review. This is more than enough for an agent to understand what the tool does.

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 guidance on when to use this tool versus alternatives. It does not mention conditions like 'use this when you need to change tone but keep facts' or 'do not use for factual research.' The only context is that it uses buyer-supplied information, but that is more of a constraint than usage direction. No alternatives are named, so the agent must infer applicability.

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