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

No annotations are provided, so the description carries the full behavioral burden. It discloses nothing about input format, expected units, or return shape, and only adds the tangential note of 5 free trial calls per signed wallet. For a no-annotation tool this is a thin disclosure.

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 definition is short and front-loads the core operation before the pricing note. The emoji-and-pricing clause is promotional filler, but it costs little space.

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 annotations, no output schema, and two undocumented string parameters, the description leaves the agent guessing about units (m/s vs. Hz), how to format numeric strings, and what the result looks like. Given the tool's simplicity it is not catastrophic, but it is incomplete.

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 0% for both parameters, and the description does not compensate: speed and frequency are named only via the formula, with no units, accepted formats, or numeric-string expectations. Both parameters are also optional (0 required), and the description never explains what happens if one is omitted.

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 a specific verb and resource (computes wavelength) and even gives the formula (speed divided by frequency), so the operation is unambiguous. It does not, however, differentiate itself from nearby siblings such as x402-wave-speed, x402-speed, or x402-frequency, which an agent could easily confuse it with.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternative tools. The only additional sentence concerns free trial calls, which is billing information rather than usage guidance.

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