convert_currency

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

No annotations are provided, so the description carries the full burden. 'Get' and 'current' imply a read-only lookup, and the description usefully discloses the return shape (ratio plus both currency codes), but it says nothing about rate source, freshness/update frequency, or whether it covers only a single pair. Adequate but thin for an annotation-free tool.

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?

Three short sentences, front-loaded with the core action, then usage context, then return value. Every sentence carries information with no redundancy.

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 output schema, the description compensates by naming what is returned (conversion ratio and both currency codes), and both required params are schema-documented. Only minor gaps remain, such as rate provenance and freshness guarantees.

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%, and both parameters ('from'/'to' ISO codes) are fully documented in the schema. The description adds the directional example (USD → BRL) and confirms both currency codes come back, but contributes no syntax or constraint detail beyond the schema, so baseline 3 applies.

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+resource ('Get the current Mercado Livre exchange rate between two currencies') with a concrete example (USD → BRL). No sibling tool performs currency conversion, so an agent can route to it unambiguously.

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?

Gives clear context for use ('cross-border pricing or comparing prices across Meli sites'), which tells the agent when this tool is relevant. It stops short of explicit when-not conditions or named alternatives, but no sibling offers overlapping functionality.

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