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 states no preconditions or assumptions (e.g., whether both speed and wavelength are required, what unit convention applies, or how frequency vs. period is selected). For a calculation tool with zero annotation coverage this is a significant disclosure gap.

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?

It is a single short sentence, so there is no bloat, but it is under-specified rather than concise. The one sentence does not front-load any operational information an agent needs.

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 two-parameter physics calculation with no annotations, no output schema, and only restated parameter names, the description leaves required behavior entirely unstated. There is no unit convention, no formula hint, and no explanation of the frequency/period relationship.

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 coverage is nominally 100%, but the parameter descriptions are trivial restatements ('Speed to process', 'Wavelength to process'). The description adds nothing about units, expected numeric format (both params are typed as string), or which of the two parameters is required for which output. With low real signal in both schema and description, this falls below the baseline 3.

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 names the resource ('Frequency') and its scope ('Frequency and period calculation'), which tells an agent this computes wave frequency/period. However it is essentially a restatement of the tool name with a slightly broadened scope, and gives no indication of the formulas or inputs beyond the title. Siblings like x402-wavelength or x402-period exist, but the description does not differentiate from them.

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 condition under which this should be chosen over x402-wavelength, x402-period, or x402-wave-speed. An agent must infer applicability purely from the name and the two parameters.

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