garmin_activity_splits

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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds that the result is per-lap data, but it does not explain split units, pagination, or behavior when an activity has no splits. This is acceptable for a simple read-only tool but not richly transparent.

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 short phrase with no filler or repetition. It front-loads the core concept and earns its place, though it could arguably be a complete sentence.

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 one-parameter read-only tool, the description plus schema is minimally workable. However, there is no output schema and no mention of what a split contains or what happens when no splits exist, leaving the agent to infer the return shape.

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 schema only gives the parameter name 'activity_id' with type string and zero schema description coverage. The description implicitly ties that parameter to a Garmin activity, but it does not clarify expected format or value origin. The parameter is self-explanatory enough to keep this at a baseline score.

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 identifies the resource and scope: per-lap splits and an activity. It is distinct from sibling tools like garmin_activity or garmin_activity_weatherhol, but it lacks an explicit verb such as 'retrieve' or 'get', so it is clear rather than fully action-oriented.

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?

There is no guidance about when to use this tool instead of related tools such as garmin_activity or garmin_activities_by_date. The description neither suggests prerequisites nor rules out alternatives.

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