x402_crypto

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does disclose the per-call cost ($0.01 USDC) and the live nature of the data, which is useful context. However, it omits authentication requirements, rate limits, error behavior, and data source details, leaving meaningful gaps.

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 a single sentence that front-loads the core purpose and cost with no filler. Every word contributes useful information, making it highly efficient and easy for an agent to parse.

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?

For a tool with one optional parameter and no output schema, the description plus schema cover the essential facts: the data returned, the unit, the cost, and the parameter. The description names the output fields, but minor omissions like response format and data source prevent a perfect score.

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 documents the single optional 'coin' parameter with an example and a default value, so schema description coverage is 100%. The description adds no additional parameter semantics beyond what the schema provides, so the 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 names the resource (crypto) and the data returned (live price, 24h change in USD), which distinguishes it from sibling tools like x402_stock and x402_fx. It does not explicitly contrast itself with those alternatives, but the resource and metric are specific enough for an agent to infer the tool's purpose.

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 the tool should be used when live crypto price and 24h change data are needed, but it provides no explicit when-to-use guidance, no exclusions, and no mention of alternative tools. This is implied usage rather than clear, actionable guidance.

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