get_latest_body_composition

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

With no annotations, the description must convey safety and behavior. 'Return' implies a read-only operation and the 30-day filter is disclosed, but edge cases like no records found, data availability, or ordering are not addressed. It is not misleading but leaves room for assumptions.

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 sentence that leads with the verb, states the object, and includes a temporal constraint. Every word earns its place with no redundancy.

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 tool is a simple zero-parameter retrieval and an output schema exists, the description covers the essential behavior. However, the 30-day window is a notable limitation that could spark questions about why that specific window, but this is a minor gap and does not hinder invocation.

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?

There are zero parameters, so the schema covers everything trivially. The baseline for 0 params is 4, and the description adds no parameter confusion. No additional semantics are needed.

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 ('Return'), the resource ('body composition record'), and a specific constraint ('most recent within last 30 days'). This distinguishes it from siblings like get_measurements_range (range-based) and get_body_composition (likely general retrieval).

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 implies use when a recent body composition record is needed within a 30-day window, but it does not explicitly mention when to avoid this tool or cite alternatives such as get_body_composition or get_measurements_range. Context is implied rather than stated.

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