Get Fitatu Body Measurement

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds valuable behavioral context beyond annotations by explaining the date-omission fallback and the scope across weight, circumference, and body-fat history.

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?

Two sentences with no filler. The primary operation and resource are front-loaded, and the second sentence clarifies the optional-date behavior. Every word earns its place.

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?

The tool has one optional parameter, a complete schema, rich annotations, and an output schema. The description covers the only meaningful behavioral nuance (default date selection). Nothing an agent needs to invoke it correctly is missing.

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?

Schema description coverage is 100% and the only parameter, date, is already described with format and optionality. The description adds the defaulting behavior ('defaults to the latest available entry') but does not need to explain the parameter further, so the baseline of 3 is appropriate.

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 action ('Gets'), the resource ('the authenticated Fitatu user's body measurement'), and the optional date scope. It avoids tautology by adding the default behavior, and the read/write distinction from save_body_measurement is evident from the verb.

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?

The description gives clear context for when to call the tool: retrieving a body measurement for an optional date, with the latest measurement returned when date is omitted. It does not explicitly name sibling alternatives or state when not to use it, but the read-only verb and the write-focused sibling save_body_measurement make the intended use reasonably clear.

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