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, and it reveals nothing: no computation semantics, no side effects, no return-format hints, no mention of what "percent of value" actually produces. The description is a restatement, not a behavioral 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 text is short but this is under-specification, not conciseness — the phrase "Percent Of Value" is simply repeated after a colon with zero additional content. Front-loading cannot compensate when there is no substance behind it.

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 and no output schema, the description was the only vehicle for complete guidance, and it says nothing about inputs, outputs, or behavior. An agent cannot determine what to send, what to expect back, or when to choose this tool over at least four closely named percentage siblings.

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 declares 0 parameters, so there is technically nothing to document per the baseline. However, the tool name implies operands (a value and a percentage) that are absent from the schema, and the description neither confirms this is a no-input tool nor explains how the operands are obtained — leaving the invocation mechanism opaque.

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 "Percent Of Value: Percent Of Value" is a pure tautology — it restates the tool name/title without adding any meaning. It never states what the tool computes, what operation it performs, or how it differs from overlapping siblings such as x402-percent-of, x402-percentage-of, and x402-percent-change-of.

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 guidance whatsoever about when to use this tool versus alternatives. Given the dense set of sibling tools with nearly identical names (x402-percent-of, x402-percentage-of, x402-fraction-to-percent), an agent receives zero help distinguishing this from them.

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