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

No annotations are provided, so the description carries the full burden. It does disclose a key behavioral fact ('Free'), but it does not explain what 'how to pay' means if the service is free, nor what the tool returns (e.g., a list, a message, a link). For a simple informational tool this is adequate but minimal.

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 two short sentences with no filler. 'What each Whysaid verification costs and how to pay. Free.' is front-loaded and every word earns its place. The standalone 'Free.' is abrupt but still informative.

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, no-output-schema tool, the description covers the essential information: costs and payment method. The only ambiguity is the relationship between 'how to pay' and 'Free,' but overall the description is sufficient for an agent to understand the tool's purpose and invoke it appropriately.

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 has zero parameters, so the baseline is 4. The description does not need to explain parameter semantics because there are none. No additional parameter information is required.

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 the tool provides pricing information ('what each Whysaid verification costs') and payment instructions ('how to pay'). It distinguishes itself from the sibling verification/share tools by focusing on cost rather than verification actions. It lacks an explicit verb like 'get' or 'list,' but the noun-phrase framing is still specific and unambiguous.

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?

Usage context is implied rather than explicit: the name 'pricing' and description make it obvious this is for cost/payment questions. However, there is no direct guidance on when to use this tool versus alternatives, nor any exclusion criteria. The sibling tools are clearly different in function, so the lack of explicit guidance is a minor gap.

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