Profile and zones

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description usefully discloses the payload contents (profile attributes plus heart rate zones), but adds nothing about authorization requirements, per-account scoping, or whether zone data requires device sync.

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 front-loaded sentence that names the source, the resource, and the key fields. The trailing 'and others' is slightly vague but keeps it brief; nothing extraneous.

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?

With no output schema, the description carries the burden of return-value disclosure and does so by listing the main fields returned. For a zero-parameter read tool with full annotation coverage, this is nearly complete, though a hint about the zones structure (sport-specific zones) would help.

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?

The tool takes no parameters, so the baseline is 4; the description correctly implies a parameterless single-profile fetch. Nothing is required of it beyond confirming the call needs no arguments.

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 a specific verb (implicit retrieval) and resource: profile settings from Garmin Connect, enumerating units, age, sex, height, weight and heart rate zones. This clearly sets it apart from the metric-focused siblings like get_steps or get_sleep, though it never names them explicitly.

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?

Usage is only implied — an agent can infer this is the tool for user profile attributes and zone configuration rather than daily metrics, but there is no explicit when-to-use statement or reference to alternatives among the 17 sibling tools.

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