wapupay_exchange_rates

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

With no annotations provided, the description carries full burden. It correctly notes that the tool is publicly accessible and requires no authentication, which is a key behavioral trait. However, it does not disclose details like rate update frequency or whether rates are bid/ask, but for a simple rate getter, this is sufficient.

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 extremely concise—two sentences that front-load the purpose and then provide a key usage guideline. Every word earns its place.

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?

Given the simplicity (no parameters, no output schema), the description is fully complete. It tells the agent exactly what the tool does and that it requires no authentication. No additional context is necessary.

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 input schema has no parameters, so schema description coverage is 100%. The description adds no parameter information, but none is needed. Baseline for zero parameters is 4.

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 the verb 'Get' and the resource 'exchange rates' with a concrete example (USDT/ARS). It effectively distinguishes this tool from sibling tools like wapupay_quote (which provides quotes for specific amounts) and changelly_* tools (which involve different services).

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 description explicitly states 'Public — no login or API key,' indicating it can be used without authentication. While it does not explicitly contrast with alternatives, the context of sibling tools makes the purpose clear. Slight improvement could include when to prefer this over wapupay_quote or changelly_quote.

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