ovulation_calc

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

There are no annotations, so the description carries the full burden. It adds only a cost note ('Costs $0.001 USDC via x402') and a vague category label, but discloses nothing about the tool's behavior—such as whether it is read-only, what side effects exist, or what the output format is. This is insufficient for an agent to anticipate consequences.

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 short sentence, which is concise in length but not in substance. It lacks essential information and reads as under-specification rather than efficient communication. While there is no bloat, the brevity is not a virtue because it omits critical details.

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 the lack of annotations, output schema, and specific parameter definitions, the description is far from complete. An agent has no way to infer the tool's purpose, inputs, or outputs, making it inadequate for reliable invocation. The name provides a hint, but the description fails to deliver sufficient context.

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 contains only a generic 'params' object with no property descriptions, and the description provides no hints about expected keys or their meanings (e.g., cycle_length, last_period_date). Neither the schema nor the description offers meaningful guidance on how to structure the parameters, so an agent cannot know what to pass.

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 only states 'ovulation calc — Other Utilities tool' which merely restates the tool name and its generic category. It does not specify what the tool does (e.g., calculates ovulation dates, fertile windows), nor does it distinguish it from health-related siblings like calculate_bmi or tdee_calc. This is a tautology with minimal added meaning.

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?

No usage context is provided. The description does not indicate when to use this tool versus alternatives, what inputs are required, or any prerequisites (e.g., knowing cycle length or last period date). It offers no guidance on selection, making it unhelpful for an agent deciding between this and other calculators.

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