pay_fiat

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

No annotations are provided, so the description bears full responsibility. It mentions pricing and a free tier, but does not disclose whether the tool executes a payment, any side effects, idempotency, error behavior, or authentication requirements. The description is insufficient for safe invocation.

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 short, consisting of a single line with purpose and pricing. It is efficient and front-loaded with the tool's core function. However, it sacrifices completeness for brevity.

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 2 required parameters, no output schema, and no annotations, the description does not cover what the response contains, success/failure behavior, rate limits beyond the free tier, or any other operational details. A payment tool requires more context for reliable use.

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 100% coverage with descriptions for both 'amount' and 'currency'. The description does not add any additional meaning beyond the schema. Baseline score of 3 is appropriate as the schema already documents the parameters adequately.

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 states it is a fiat payment interface, and the name 'pay_fiat' combined with parameters 'amount' and 'currency' clearly indicate the tool's purpose. However, the description is in Chinese and does not explicitly state the action (e.g., 'initiate a payment') or differentiate from sibling pay_crypto.

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?

No guidance is provided on when to use this tool versus alternatives like pay_crypto. No prerequisites, conditions, or context for use are mentioned beyond pricing. The description lacks explicit usage instructions.

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