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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond the date scoping — no note on data granularity, sampling cadence, availability, or empty-response behavior for a health-metric read.

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?

A single short sentence with no filler and the scope front-loaded. It is efficient, though arguably at the edge of under-specification rather than maximal conciseness.

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 simple single-parameter read tool this is minimally adequate, but with no output schema the description should at least hint at what the returned breathing-rate data looks like (samples, timestamps, aggregation). As written, the agent knows what to pass but nothing about what comes back.

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%, so cdate is fully documented (YYYY-MM-DD, UTC). The description's 'one date' restates the schema rather than adding format or timezone nuance, so the baseline 3 applies.

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?

States the resource precisely (breathing-rate data) and the scope (one date), which an agent can map to the get_respiration_data verb. It does not differentiate itself from closely-patterned siblings such as get_hrv_data, get_spo2_data, or get_stress_data, but the resource is unambiguous.

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 statement of when to use this tool versus alternatives, no prerequisites, no exclusions. The agent must infer usage purely from the name and the date parameter.

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