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

No annotations exist, so the description carries the full behavioral burden. It usefully discloses the pay-per-call cost ($0.005, USDC on Base), but says nothing about the return shape (string vs. numeric triple), date-range validity, or error behavior for invalid inputs.

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?

A single front-loaded sentence with no filler; the parenthetical cost note is compact and operationally relevant rather than padding.

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 stateless conversion tool with no annotations, no output schema, and zero parameter documentation, the description omits the one thing an agent cannot infer: what the call returns. It is not sufficient on its own to invoke the tool correctly.

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% across all 3 required parameters, so the description must compensate and does not. There is no hint of accepted formats or ranges (e.g., four-digit year, 1-12 month) beyond the self-evident parameter names.

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?

States a specific verb and resource ('Convert a Gregorian date to the Jalali calendar') with the conversion direction made explicit, which lets an agent instantly distinguish it from the sibling fa_jalaliToGregorian without opening either schema.

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?

The direction of conversion implies when the tool applies, but the description never states when to prefer it over the reverse sibling or any prerequisite/edge-case conditions. Usage is inferable from the name only.

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