getDailyHeartRate

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

With no annotations, the description carries the full behavioral burden. It discloses that results are daily and include resting heart rate, but it does not mention permissions, timezone/local-date behavior, no-data handling, or the returned data shape.

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 front-loaded sentence with no filler. Every component—resource, scope, included resting heart rate, and date format—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?

For a simple one-parameter getter with full schema coverage, the description is minimally adequate. However, with no output schema and no annotations, it could say more about the returned daily heart-rate structure and edge cases.

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 is already documented as a yyyy-MM-dd date. The description repeats the date format but adds no further semantics such as timezone or range constraints, so the baseline of 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?

The description states a specific verb/resource and scope: daily heart rate for one date, including resting heart rate. It is clear what the tool returns, but it does not explicitly distinguish itself from related siblings such as getHeartRateZones, getHrvRange, or getDailySummary.

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 one-date scope implies when the tool is applicable, but there is no explicit when-to-use or when-not-to-use guidance. It also does not name alternatives or explain how to choose between this and related heart-rate or daily-summary tools.

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