Get Google Health Identity

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds no additional behavioral details beyond confirming it retrieves identity mapping, which is consistent but not additive.

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 concise sentences with no extraneous words. It is front-loaded with the core action. However, the structure could benefit from a brief note on the meaning of 'identity mapping' to reduce ambiguity.

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?

The tool has 2 optional parameters, comprehensive annotations, and an output schema (not shown but indicated). The description provides a minimal but functional overview. It does not explain the return format (covered by output schema) or when to use this versus identity-related siblings (e.g., google_health_get_profile), leaving some gap in completeness.

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 50% (only privacy_mode has a description; response_format lacks one). The tool description does not mention or clarify the parameters, leaving the agent to infer meaning from the schema alone. With low coverage, the description should compensate but fails to do so.

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 it retrieves the Google Health identity mapping for the authenticated user and explicitly mentions a specific use case (Fitbit-to-Google migrations), distinguishing it from sibling tools that handle data points, profiles, or settings.

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 description gives a concrete usage scenario (Fitbit-to-Google migrations), which implies when to use the tool. However, it does not explicitly exclude other use cases or compare with alternative tools like google_health_get_profile, though the sibling list is large and diverse.

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