환율 변환 계산기 (프리미엄)

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

With no annotations provided, the description discloses key behaviors: it optionally calls a free public API (open.er-api.com) for real-time rates and performs real-time Gumroad license verification. This adds significant context beyond the schema, though it doesn't cover all edge cases like API failures.

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 two sentences, front-loaded with a premium tag, and every clause provides necessary information: the conversion behavior, the API fallback, and the license requirement. No filler or 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?

The description is fairly complete for a simple calculator tool: it explains the core mechanics and a prerequisite. It does not describe the output format, but the absence of an output schema and the simplicity of the task make this acceptable.

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 schema already describes all four parameters, giving high coverage. The description adds operational meaning by explaining that the '환율' parameter is optional and triggers a real-time API lookup when omitted, which is not apparent from the schema alone.

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 tool converts currency, using '환율 변환' and '통화를 변환합니다.' It distinguishes itself from sibling calculator tools by specifying exchange rate conversion, and the premium tag further differentiates it.

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 provides clear context on when to use the tool: it requires a premium license and specifies the behavior when an exchange rate is provided versus omitted. It does not explicitly mention alternatives or exclusions, but the purpose is distinct enough among siblings.

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