calculate_age

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

With no annotations, the description carries the full burden. It does disclose a cost and payment method ($0.001 USDC via x402), which is useful, but it says nothing about side effects, input requirements, or output behavior.

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 but not meaningfully concise. 'calculate age' is redundant, 'Other Utilities tool' adds no value, and only the cost sentence is informative. The structure is fragmented.

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 tool with no annotations and no output schema, the description is severely inadequate. It fails to explain what inputs are required, what the output represents, or any edge cases. An agent cannot reliably invoke this tool based on the provided description.

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?

The schema only has a generic 'params' object with no specific fields, and the description does not clarify what parameters (e.g., birthdate) are needed. Despite high schema coverage, the schema provides no real semantic help, and the description adds none.

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 is essentially a tautology: 'calculate age' repeats the tool name without specifying what kind of age, what input is expected, or what output is produced. 'Other Utilities tool' is a generic category label, not a purpose statement.

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?

There is no guidance on when to use this tool versus alternatives like domain_age or fitness_age_calc. No context, prerequisites, or exclusions are provided.

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