oura_sleep_periods

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

No annotations are provided, so the description must carry the behavioral burden. It does disclose an important limitation (optional HR curve limits range to 31 days) and summarizes output fields. However, it does not mention timezone handling, whether naps are merged with main sleep by default, or other operational behaviors.

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 compact and front-loaded with the core purpose, followed by a useful parameter-specific caveat. It is a single well-organized block, though the metric list is somewhat long.

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 description gives a solid sense of the returned sleep metrics and one important range limitation, but without an output schema or annotations it leaves open how start/end are formatted, whether naps are included by default, and how errors or excessive ranges are handled.

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 minimal: only start and end types exist, with no semantic detail. The description explains the effect of include_hr_curve (5-min curve and 31-day limit), but does not clarify start/end format, main_sleep_only behavior, or any other parameter constraints.

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 identifies this as a sleep-summary tool listing specific metrics (bedtime, wake, midpoint, HRV, etc.), which makes its purpose obvious. It does not explicitly contrast itself with sibling tools, but the content is specific and distinguishable enough.

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 given for when to use this tool versus alternatives, and no exclusions are stated. The agent must infer usage solely from the title and metric list; only the HR-curve date-range limitation provides any contextual constraint.

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