get_activity_splits

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

With no annotations, the description must carry the behavioral burden. It signals a read-only operation via 'Get' and clarifies the input source as list_activities, but it does not disclose the response format, error behavior, or whether splits exist for all activities.

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 two sentences with no filler. The purpose is front-loaded, and the only additional sentence provides necessary parameter context. Every part 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, the description explains the scope and the source of the activity ID. However, because there is no output schema and no annotations, it leaves gaps around the shape of the returned lap/split data and possible 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 0%, so the description must compensate. It does this by explaining activity_id as 'The Garmin activity ID, as returned by list_activities,' which adds real semantic meaning beyond the bare string schema. It is concise but sufficient for the single parameter.

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 and resource: 'Get lap/split data for a single activity.' This clearly separates it from list_activities and get_activity by scope and data type, though it does not explicitly name sibling alternatives for differentiation.

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 usage context is implied: use this tool when lap/split data for one activity is needed, and obtain the activity_id from list_activities. However, there is no explicit when-not-to-use guidance or comparison with related tools like get_activity.

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