garmin_lactate_threshold

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

With no annotations, the description carries the full burden of behavioral disclosure. It describes the data returned but says nothing about read-only nature, authentication requirements, data freshness, or any limitations. The output schema exists, but the description adds no behavioral traits beyond the raw data definition.

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 three short sentences, front-loaded with the key information about what is returned, followed by a concise definition and use case. Every sentence is brief and contributes context without filler.

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 read-only tool with no parameters and an output schema, the description is nearly complete. It conveys what the tool returns and its purpose. The only gap is guidance on when to prefer it over related metrics, but that is a minor omission given the tool's specificity.

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?

There are no parameters, so the schema itself is trivial and complete. The description does not need to add parameter semantics, and the baseline for zero parameters is 4.

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 clearly states the resource (lactate threshold pace and heart rate) and adds a scope qualifier ('by sport'). It distinguishes from siblings like garmin_hr_zones or garmin_vo2max by focusing on lactate threshold, but it lacks an explicit verb such as 'Get' or 'Retrieve', keeping it from a perfect score.

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 gives an implied use case ('Used to set training zones and pace targets for races'), which tells the agent why the data is relevant. However, it does not state when to use this tool versus alternatives like garmin_hr_zones or garmin_training_status, nor does it offer any exclusions.

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