get_garmin_scores

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

With no annotations, the description carries the burden of explaining behavior. It does disclose the scope (one day) and the contained metrics, but it does not state what happens when the optional day is null, whether the numbers have units, or how the response is shaped. The core read behavior is clear, but edge behavior is left implicit.

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, well-structured sentence with no filler. The resource, scope, and returned metrics are front-loaded in a way an agent can parse quickly.

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 read tool, the description covers the main purpose and output fields, but it lacks a statement about the null default, lacks units, and gives no differentiation from overlapping sibling tools. The absence of annotations and output schema raises the burden, so the description is only minimally adequate.

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 coverage is 0%, so the description must compensate. It adds the critical YYYY-MM-DD format for day, which the schema does not specify. However, it never explains that the parameter is optional/defaults to null, nor what null means, leaving part of the parameter semantics undocumented.

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 verb-resource pair (get Garmin fitness scores) and scopes it to a single day. It enumerates the returned metrics (Vo2Max, Endurance, Power), which distinguishes it from the many sibling health/training getters that do not mention these fields.

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 on when to choose this tool over alternatives such as get_training_status_daily or get_daily_summary. The only implied usage context is the date parameter, which is common to nearly all sibling tools, so it does not help an agent decide.

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