Get Biorhythm

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

With no annotations, description carries full burden. It discloses that date calculation is UTC midnight (timezone independent), which is a key behavioral detail. However, it does not mention return format specifics, error conditions, or authentication needs.

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 sentences with no redundant information. First sentence defines purpose and output, second clarifies a critical behavioral detail. Every word is functional.

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?

Given no output schema, the description could specify how values and chart are returned (e.g., JSON with base64 PNG). However, for a straightforward biorhythm tool, the description is largely complete. Missing output format details slightly reduce completeness.

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 provides 100% coverage with descriptions for all three parameters. Description adds value by specifying the cycle periods (23,28,33), which are not in the schema. This enhances understanding beyond the 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?

Description clearly states the tool receives a birthdate and returns biorhythm values for physical (23), emotional (28), and intellectual (33) cycles along with a sine wave chart PNG. It specifies the exact resource and action, distinguishing it from any potential siblings.

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?

Description implicitly conveys usage (computing biorhythms) and includes constraints like date calculation at UTC midnight. No explicit when-not-to-use or alternatives, but no sibling tools exist to differentiate from.

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