get_daily_cardiovascular_age

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

No annotations provided; description carries full burden. It implies a read operation (get) but does not explicitly state readOnlyHint, authentication needs, or any side effects. Lacks disclosure of what data dependencies exist (e.g., resting heart rate and HRV must be available).

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?

Purpose stated in one sentence, then parameter details separated; no wasted words. However, the parameter layout is plaintext with line breaks, not markdown or structured, which slightly hurts readability.

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 parameterless tool with output schema (not shown), the description covers purpose and parameter defaults. But lacks behavioral transparency and usage guidance, which are expected given no annotations and many siblings. Adequate but incomplete.

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 0%, so description must compensate. It provides format (YYYY-MM-DD) and defaults (yesterday/today) for both parameters. This adds meaningful guidance beyond the bare schema, though no additional constraints (like max range) are given.

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?

Verb get plus resource estimated cardiovascular age is specific. Mentions basis on resting heart rate and HRV trends, which distinguishes from sibling tools like get_daily_activity or get_daily_readiness. No confusion about what it retrieves.

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 on when to use this tool versus alternatives. Does not provide context for prerequisites, data freshness assumptions, or whether user needs to wear the ring for data to exist. No exclusions or when-not-to-use.

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