Birthday (pythagorean)

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

Annotations already declare readOnlyHint true and idempotentHint true, indicating safe read behavior. The description adds minimal behavioral context: it mentions calculating from the day-of-birth digit, but does not explain the role of optional parameters (latitude, longitude, timezoneOffset) or clarify that the tool only uses the day part of the date, not the full date.

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 short and includes a group tag and example request body. It is efficient but could be improved by front-loading the most critical information (e.g., that only the date is needed) and removing the generic example.

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?

With no output schema, the description should hint at the return format (e.g., a single number). It does not. Additionally, the purpose of optional location/time parameters is not explained, leaving the tool's behavior under-specified for a calculation that might depend on timezone.

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%, so baseline 3 is appropriate. The description does not add meaning beyond the schema; it only provides an example request body with a date. Optional parameters remain unexplained, but the schema already describes them.

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 it calculates the Birthday number from the day-of-birth digit and specifies the Pythagorean system. The verb 'Calculate' and resource 'Birthday number' provide a clear action and object, though it does not differentiate from many sibling numerology tools with similar names.

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 is provided on when to use this tool versus alternatives such as other Pythagorean numerology tools (e.g., life path, expression). The description lacks any context, exclusions, or when-to-use instructions.

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