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

With no annotations, the description carries the full burden, but it does add genuinely useful non-schema context: the pay-per-call cost ($0.005, USDC on Base) and the shape of the returned data (capital and major cities). It still omits error/not-found behavior and whether a missing province yields an empty result or an error, which matters for a paid call.

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 sentence that front-loads the action and resource, then tacks on the return payload and cost. No filler, no repetition of the tool name, nothing to cut.

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?

No annotations and no output schema, so the description must cover behavior and results; it partially does by naming the returned fields and the price. But with zero required parameters and three interchangeable name fields, it never tells the agent that a province name must be supplied, nor what happens on a miss.

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 the three parameters (name plus its text/value aliases) are already documented in the schema, making the baseline 3 appropriate. The description adds only "by name" and says nothing about the alias behavior or that the Persian-script name is expected.

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 ("look up an Iranian province") plus the payload ("capital and major cities"), so the agent knows exactly what comes back. However, it never distinguishes itself from the near-identical sibling fa_iranProvinces (plural listing) or fa_iranCity; only the phrase "by name" hints that this is a single-record lookup.

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 explicit when-to-use guidance and no mention of the obvious alternative fa_iranProvinces or fa_iranCity. The agent must infer from the singular name that this returns one province rather than a list, which is exactly the kind of routing decision the description should make explicit.

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