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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint false, and closed-world behavior. The description adds useful output-handling context about checking serviceAnnouncements and displaying them, but it does not explain what happens if calendarDate is omitted or what the summary response otherwise contains.

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 and front-loads the core purpose. The second sentence adds the serviceAnnouncements display requirement without excessive wording, though it is somewhat operational rather than descriptive.

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, one-parameter tool with full schema coverage and rich annotations, this is mostly complete. The main gaps are the missing default behavior when calendarDate is omitted and lack of differentiation from related wellness/daily summary siblings.

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 100%, and the schema already defines calendarDate as a date in YYYY-MM-DD format. The description only reinforces that it is for a single calendar date; it adds no default, timezone, or omission behavior beyond the schema.

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: 'Read your Garmin wellness summary' for 'a single calendar date.' It does not explicitly distinguish this from siblings such as garmin_get_wellness_history or garmin_get_daily_summaries, so it falls short of a 5.

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 phrase 'for a single calendar date' implies this is a point-in-time summary rather than a history query. However, it gives no explicit when-to-use guidance, exclusions, or named alternatives.

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