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

No annotations and no output schema, so the description carries the full disclosure burden and bears none of it beyond "5 free trial calls per signed wallet." It says nothing about the computation, expected units, result format, or what a signed-wallet trial actually entails after the five calls.

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?

Very short and front-loaded, but roughly half the text is promotional copy rather than specification. The definition is concise because it is under-specified, not because it is efficient.

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 simple single-input calculation with no output schema and no annotations, the description should at minimum define the input format and result units. Neither is present, leaving the agent unable to construct a valid call without guessing.

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 single parameter "frequency" is typed as a bare string with 0% schema description coverage, and the description adds nothing about whether it takes a number, a value with units like "500 THz", or a wavelength to convert. This is the one detail an agent must get right in order to call the tool at all, and it is entirely absent.

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?

"Photon Energy: Energy of photon" identifies the resource but the second clause merely restates the name; the operation (compute E from frequency via E=hf) is implied, not stated. With dozens of near-neighbors such as x402-energy, x402-frequency, x402-frequency-unit, and x402-wavelength, the description gives no cue for choosing this one over those.

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 context, no mention of when a caller should prefer x402-energy or x402-wavelength instead, and no prerequisites. The only directive is the trial-call note, which is eligibility, not usage guidance.

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