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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It reveals nothing about how age is computed, what units are returned, how edge cases like leap years or future dates are handled, or whether dob and birthdate are aliases or have separate meanings.

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 this is under-specification, not conciseness. It consists of a single meaningless sentence that earns no place; even a blank description would be no less helpful.

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 annotations, no output schema, and no meaningful description, an agent has almost no information to invoke this tool correctly. The ambiguity around the two input parameters alone makes the definition inadequate.

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 coverage is 100%, so the baseline is 3, but the description adds no parameter meaning beyond the already-generic schema descriptions. Critically, it does not explain the relationship between dob and birthdate, leaving an agent to guess whether they are redundant, required together, or format-constrained.

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 a pure tautology: "Age Calculate: Age Calculate" simply restates the tool name with no verb, no resource, and no explanation of what the tool computes. An agent cannot determine what this tool does beyond guessing from the name.

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 zero guidance on when to use this tool versus alternatives. The sibling list contains x402-age and many date-related tools, but the description gives no signal about which scenario selects this tool or how it differs from them.

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