fitness_age_calc

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 discloses one behavioral trait—the $0.001 USDC cost via x402—but says nothing about how the tool behaves, what data it processes, what outputs it produces, or any limitations. This is minimal and insufficient.

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 extremely short, but this is under-specification rather than conciseness. While it has no wasted words, it omits essential information needed for understanding and using the tool, making it ineffective despite its brevity.

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 no annotations, no output schema, and an uninformative input schema, the description is completely inadequate. It does not explain what the tool does, what inputs it needs, or what results to expect. It is far from sufficient for the agent to invoke it correctly.

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 specific fields or semantics. The description adds no parameter information, failing to compensate for the schema's lack of detail. The user is left without any clue about what parameters to provide.

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 'fitness age calc — Health & Fitness tool' essentially restates the tool name without adding a specific verb or resource. It categorizes the tool as Health & Fitness but fails to explain what it actually calculates or does, making it a tautology.

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 guidance on when to use this tool, what inputs are required, or how it compares to sibling health calculators like calculate_bmi or bmr_calc. The description provides no context for selecting this tool over alternatives.

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