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

Annotations already declare readOnlyHint=true, so safety is covered. The description adds the genuinely useful behavioral note that values are 'relative to baseline' (not absolute readings), but omits return format, data availability, or rate-limit context.

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?

Two compact sentences, front-loaded with the resource and the baseline qualifier. The trailing REST endpoint reference is arguably redundant for an agent but is short and does not obscure the meaning.

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 read-only fetch with a fully documented schema and no output schema, the description covers resource, scope, and the baseline-relative semantics. It could note empty-data behavior, but nothing essential for calling the tool is missing.

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 description coverage is 100%, with both 'date' and 'endDate' fully documented including format and optionality, so the baseline is 3. The description adds no parameter syntax or semantics beyond what the schema already provides.

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?

States a specific resource (skin temperature) and scope (for a date or range), and adds the important qualifier 'relative to baseline' that distinguishes what the value means. It does not explicitly differentiate from sibling metric tools, but each sibling covers a distinct metric so confusion is unlikely.

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 or range' hints at usage, but there is no explicit when-to-use, when-not-to-use, or reference to any alternative tool. The agent must infer context from the name alone.

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