Get menstrual cycle day

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful behavioral detail: it names the returned categories and explains that reduced returns a lighter response, skip_baby_movement removes kick counts, and include_analysis adds Garmin’s cycle analysis.

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 front-loaded with the return contents and then gives compact parameter notes. It is appropriately sized for a five-parameter tool with no schema descriptions, and no sentence is wasted.

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 read-only, five-parameter tool with no output schema and no schema descriptions, the description covers the returned data categories and every parameter. It could be more complete by explicitly routing between this tool and garmin_get_menstrual_cycle, but otherwise an agent has enough to call it correctly.

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, and it does explain all five parameters. It gives the date format and default for date, clarifies that today is the reference date for predictions, and describes the three boolean flags, though “reduced: return a lighter response” remains somewhat vague.

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 that this tool retrieves one day of menstrual-cycle detail, listing symptoms, flow, mood, cycle summary, and pregnancy weight-goal ranges. The verb and resource are specific, but it does not explicitly distinguish this tool from the sibling garmin_get_menstrual_cycle.

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?

Usage is implied by “One day in detail” and by parameter defaults such as date and today, which suggest single-day lookup. However, the description never explicitly says when to choose this tool over garmin_get_menstrual_cycle or when not to use it.

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