Garmin Hydration

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

Annotations already indicate safe read (readOnlyHint=true) and idempotence. The description adds the useful behavioral trait 'when available', implying data may not always exist. No other behavioral traits like auth or rate limits are mentioned, but the annotations cover the safety profile adequately.

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 very concise at 8 words, front-loading the verb and resource. It avoids redundancy with the schema and annotations, though a slightly more detailed statement about what a hydration summary includes could improve completeness without sacrificing conciseness.

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?

Given the tool's simplicity (3 optional parameters, output schema exists), the description covers the main purpose. The schema provides parameter details, and annotations cover safety. The tool is sufficiently described for a simple read operation.

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% with all parameters described. The description does not add additional meaning beyond what the schema already provides for date, privacy_mode, and response_format. Baseline 3 is appropriate.

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 verb 'Get' and the resource 'Garmin hydration summary', with a condition 'when available'. It distinguishes from sibling tools like sleep, steps, etc., though it could be more specific about what constitutes a hydration summary.

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?

No guidance is provided on when to use this tool versus alternatives such as garmin_get_sleep_day or garmin_get_steps_day. There is no mention of prerequisites 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.