get_max_metrics

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

Lacks behavioral details such as error handling, data freshness, or what 'related fitness metrics' includes; no annotations provided to compensate.

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?

Two sentences plus a bullet are efficient and front-loaded with purpose, then parameter detail; no wasted words.

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?

Covers the essential purpose and parameter format; lack of detail on 'related metrics' is mitigated by presence of output schema, but slight gap remains.

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?

Adds value by specifying the date format (YYYY-MM-DD), which is not in the schema; for a single parameter with 0% schema coverage, this is helpful.

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?

Clearly states the tool retrieves 'VO2 max and related fitness metrics' for a specific date, distinguishing it from sibling tools that focus on other metrics like heart rate or sleep.

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 explicit guidance on when to use this tool versus alternatives; does not mention when not to use or provide scenarios where other tools would be more appropriate.

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