get_body_battery_events

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds nothing beyond the date scope: it does not say what an 'event' is, whether results can be empty, or how they are ordered or paginated. For a read tool with zero supplementary context, this is a gap.

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 front-loaded sentence with no filler, appropriate in length for a single-parameter read tool. It is efficient, though the terseness edges toward under-specification rather than crispness.

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 one-parameter read-only tool with full schema coverage and annotations, little is strictly required, and no output schema exists so return values need not be documented. Still, the key ambiguity — what constitutes a Body Battery 'event' versus the sibling get_body_battery — is unresolved.

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?

With a single parameter at 100% schema coverage (cdate with format and UTC note), the schema carries the burden, so baseline 3 applies. 'For one date' is consistent with cdate but adds no format or timezone detail beyond what the schema already states.

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 the resource (Body Battery events) and the scope (one date), so the agent knows roughly what comes back. But it never states a verb and gives no differentiation from the closely-named sibling get_body_battery, so an agent cannot tell whether 'events' means discrete charge/drain transitions or the same data as the summary tool.

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, no prerequisites, and no reference to the obvious alternative (get_body_battery or get_body_battery for a range). The agent must infer everything from the name.

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