garmin_vo2max

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe read operation that may return data outside a closed set. The description adds the date-scoped snapshot behavior, which is useful, but it does not disclose what happens when no date is provided (default null) or whether the data is per-day or a current estimate. No contradiction with annotations.

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?

One short sentence with no filler. The key resource and qualifier are front-loaded. It could be slightly more informative about the date parameter, but it earns its place as a concise definition.

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 tool has a single optional parameter and an output schema, so the description does not need to explain return values. However, the description leaves ambiguity about the default behavior (null date) and the exact scope of 'heat/altitude acclimation.' For a simple read-only metric tool, this is adequate but not complete.

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 0%, so the description must compensate for the single 'date' parameter. The description says 'as of a date,' which implies the date parameter controls the snapshot date, but it does not explain the format (e.g., YYYY-MM-DD), the meaning of null (likely current/latest), or how far back data is available. This is minimal but non-tautological value.

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 names a specific resource (VO2 max) and adds two related metrics (fitness age, heat/altitude acclimation) with a date qualifier. It is clear enough to distinguish from siblings like garmin_heart_rate or garmin_training_status, though it does not explicitly name a sibling it is not.

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 the tool reports a snapshot as of a date, which gives some context for when to use it (e.g., checking fitness metrics for a specific day). However, it does not state when to prefer this over garmin_training_status, garmin_daily_summary, or garmin_briefing, nor does it mention any exclusions or alternatives.

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