Profile, settings and identity

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

Annotations already declare readOnlyHint and openWorldHint, so the description's main remaining duties are the shape of the response and any auth or account-scoping caveats. It lists content categories but not how they are returned or what happens if no account/identity exists, adding little beyond the annotation profile.

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?

One short sentence, front-loaded with the main categories, with no redundant wording. The missing verb is a content gap rather than verbosity, so it stays efficient.

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 zero-argument read with no output schema, the description gives a reasonable inventory of what comes back, but it does not map fields to the profile/settings distinction or explain the relationship between the returned user IDs and other tools. Adequate to call correctly, thin on result interpretation.

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?

The tool takes zero parameters, so the baseline is 4; the description correctly presents this as an identity-scoped lookup with nothing to pass in. The mention of user IDs is a small extra hint that the response is keyed to an authenticated account.

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 enumerates the resources involved (Google Health identity, profile, settings) and gives concrete examples (age, height, units, time zone, goals), which distinguishes it from siblings like get_daily_summary or list_paired_devices. However, it is a bare noun phrase with no verb, so it never states that the tool retrieves/returns this data rather than, say, updating it.

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?

There is no when-to-use guidance at all: nothing says to call this first to obtain user IDs before calling data-point tools, and no exclusions or alternatives are named. The agent must infer usage from the name and sibling list alone.

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