get_health_snapshot

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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only states what data is combined, not any behavioral traits such as read-only nature, potential data latency, or whether the 'latest weight' might be from a previous day. There is no context on how the data is sourced or any limitations.

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 a single, focused sentence that conveys the tool's purpose and scope without any unnecessary verbosity. Every word earns its place.

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-parameter tool with an output schema, the description sufficiently explains what the snapshot contains and its scope. It could be more explicit about the read-only nature, but given the simplicity and the presence of an output schema, it is adequate.

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 schema has zero parameters, so the baseline is 4. The description adds the 'today's' timeframe, clarifying the temporal scope of the snapshot, which is useful semantic context beyond the empty schema.

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 the tool's function: 'Get today's comprehensive health summary' with a specific verb and resource. It differentiates from sibling tools by listing the combined data types (activity, sleep, heart rate, weight), making it distinct from the single-metric getters.

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 implies usage for obtaining an overall health summary but does not explicitly say when to use this instead of the individual getter tools. No exclusions or alternatives are mentioned, though the phrase 'comprehensive health summary' hints at its role as an aggregator.

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