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

With no annotations, the description carries the full burden of behavioral disclosure. It discloses the cost, duration, and consent requirement, but leaves unclear what happens if consent is missing, whether the pass auto-renews, and what the meaning of 'x402' is. No annotation contradiction exists.

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 a single concise sentence that front-loads the action and key details, then adds the consent prerequisite. There is no fluff or redundant information.

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 simple 0-param tool with no output schema, the description covers the core action, price, duration, and prerequisite, but omits post-purchase behavior or return value. The cryptic 'x402' and lack of mention of how the pass is applied leave the agent with some uncertainty.

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 input schema is empty with zero parameters, so the baseline is 4. The description adds no parameter-specific meaning because there are no parameters to describe; this is appropriate.

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 clearly states a specific verb and resource: 'Compra o passe de conteúdo adulto' (buy the adult content pass), along with concrete terms ($0.10 / 30 days). This distinguishes it from sibling tools like nsfw_consent_accept and nsfw_pass_status, which handle consent and status respectively.

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 an explicit prerequisite: 'Exige consentimento de idade antes' (requires age consent before). This tells the agent when the tool may be used, though it does not name alternative tools such as nsfw_consent_accept or nsfw_pass_status for checking existing passes.

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