health_profile

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

Annotations already provide readOnlyHint=true and openWorldHint=true, so the description carries a lower burden. It adds context by specifying the scope of the returned data (profile, unit/timezone settings, paired devices with sync state), which is useful behavioral information. However, it does not mention whether the data reflects the current user, whether units/timezone are editable or just reported, or any additional detail about the sync-state semantics beyond the label.

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 sentence of eleven words conveys the tool's full scope with zero filler. The key components are listed in a natural order: profile, then settings, then devices. There is no redundancy or repetition of the tool name or title.

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 parameterless, read-only tool with an output schema and openWorldHint, the description is adequately complete. It tells the agent exactly what area of functionality this tool covers and the presence of an output schema lets the agent inspect the return shape. The description could be improved by explicitly saying 'current user' or noting that this is the baseline profile view distinct from health data summaries, but nothing critical is missing for safe invocability.

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 input schema has no properties, so there are zero parameters to document. Per the baseline rule for 0-param tools, the description need not compensate for any schema gaps. The description appropriately matches the empty schema and adds no unnecessary parameter detail.

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 names a specific resource (Google Health profile) and enumerates its content: unit/timezone settings and paired devices with sync state. This distinguishes it from sibling tools like health_daily, health_trend, and health_readiness, which focus on data and analytics rather than profile configuration. The only gap is the lack of an explicit action verb like 'get' or 'retrieve', but the resource is so specific that intent is clear.

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 given for when to use this tool versus alternatives. It does not state e.g. 'use this to check the current user's profile settings' or 'for daily metrics use health_daily instead'. Given eight sibling tools covering related health data, the absence of any routing or exclusion guidance is a significant gap.

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