water_intake_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 does disclose a significant behavioral trait: the cost of $0.001 USDC via x402. However, it mentions no other behavior, side effects, or data handling, leaving most of the behavioral profile unknown.

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 very short, but the first clause 'water intake calc' is redundant with the tool name and adds no value. The cost information is useful, but the overall structure under-delivers on clarity and wastes space on a restatement.

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 calculator tool with no output schema and no annotations, this description is grossly insufficient. It lacks any specification of input parameters, calculation method, return format, or example usage. The cost is the only concrete detail, leaving an agent with almost no basis 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 is generic with a single 'params' object that has no internal properties. The description adds no details on what keys or values the params object expects (e.g., weight, age, activity level). Despite 100% schema description coverage, the schema is essentially a placeholder and the description does nothing to compensate.

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 says 'water intake calc' and 'Health & Fitness tool', but it never states a verb or what calculation is performed. It essentially restates the tool name and adds a broad category. This does not distinguish it from sibling calculators like calculate_bmi or tdee_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?

There is no guidance on when to use this tool, what inputs are required, or when alternatives should be considered. Among the many sibling calculator tools, no conditions or exclusions are provided.

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