Currency Conversion ($0.01)

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

No annotations are provided, so the description carries the burden. It discloses the data source (ECB) and cost ($0.01 USDC on Base), which is helpful. However, it does not mention rate limits, data freshness, error behavior, or whether it is read-only. Since it's a conversion tool, assumed read-only, but more context would be beneficial.

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 very concise: one sentence that captures the purpose, data source, and cost. Every part earns its place. It is front-loaded with the key action.

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 output schema is provided, so the description should clarify what the tool returns (e.g., rate, converted amount). It only says 'Currency conversion + live exchange rate' which is vague. With 3 parameters and no output schema, more detail on the response would improve completeness.

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%, with each parameter described. The description adds no extra meaning beyond what is already in the schema (e.g., 'From currency' is already documented). It mentions amount default 1, but that's in schema too. Baseline score of 3 is appropriate.

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 it does currency conversion and live exchange rates using ECB data, and the title explicitly says 'Currency Conversion' with a cost note. This distinguishes it from sibling tools like crypto_price or crypto_market, which focus on cryptocurrencies.

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 implies usage for fiat currency conversion but does not explicitly state when to use this tool versus alternatives, nor does it provide when-not or exclusion conditions. The sibling set helps differentiate, but the description lacks direct guidance.

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