get_spo2

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

With no annotations, the description must carry behavioral disclosure, but it only restates that the tool 'returns blood oxygen saturation readings.' It does not mention units, data availability behavior, timezone handling, or any other operational detail.

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 first sentence is front-loaded and informative. The second sentence is somewhat redundant with 'SpO2 (blood oxygen)', but the overall description is compact and easy to scan.

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 simple one-parameter getter with an output schema present, the description covers the essential calling context. Minor omissions such as units and empty-data behavior are not critical given the output schema.

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 coverage is 0%, but the description supplies the key missing meaning by specifying the date format (YYYY-MM-DD). The single required date parameter is therefore adequately explained beyond the schema's generic string type.

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 action ('Get') and resource ('SpO2 (blood oxygen) data') and adds the range ('for a date'), making the tool's function unmistakable. The resource is distinct from sibling health-metric tools such as get_heart_rate and get_respiration.

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 phrase 'for a date (YYYY-MM-DD)' gives clear context for when this tool applies—retrieving SpO2 for a single date. It does not explicitly name alternatives or exclusions, but the narrow scope is enough for an agent to select it.

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