body_surface_area

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

With no annotations, the description must disclose behavioral traits. It only mentions cost ($0.001 USDC via x402), which is a useful operational detail, but says nothing about whether the operation is read-only, what calculations are performed, what outputs are returned, or any required permissions. Minimal disclosure beyond the name.

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 (one line), but this is under-specification rather than conciseness. It omits critical information about inputs, outputs, and usage context. While it is front-loaded with the name and a category, it fails to meaningfully describe the tool.

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 tool with a generic schema, no output schema, and many health-related siblings, the description is severely incomplete. It does not explain what body surface area means, how it's calculated, what inputs are needed, or what the user will receive. The agent is left without enough context to select or use the tool 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 schema defines a single generic 'params' object with no tool-specific properties, and the description provides zero information about what parameters are expected (e.g., height, weight, units). Schema description coverage is effectively useless since the only property is a catch-all JSON object. The agent cannot determine 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 is essentially restating the tool name ('body surface area') with a vague domain label ('Health & Fitness tool'). It lacks a specific verb like 'calculate' or 'estimate', and does not distinguish itself from other health/fitness tools in the sibling list (e.g., calculate_bmi, bmr_calc).

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 guidance is provided on when to use this tool or what inputs are required. There is no mention of prerequisites, alternatives, or exclusions, so the agent has no idea how to invoke it correctly.

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