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

No annotations are provided, so the description carries the full disclosure burden and mostly fails it: nothing is said about the output shape (array of windowed maxima? scalar?), edge behavior when window exceeds input length, or whether calls fail without a signed wallet. It does add one genuinely useful fact — a 5-call free trial tied to a signed wallet — but that is the only behavioral signal.

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 short and front-loaded, with nothing padded, but the brevity is under-specification rather than efficiency; the pricing/emoji sentence occupies a large share of the text while the actual computation is left unexplained.

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 data-processing tool with no annotations, no output schema, and zero schema descriptions, the definition should specify input encoding, window semantics, and the return shape. It provides none of these, so an agent cannot confidently construct a correct call.

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 no types beyond "string" are given. The description never explains that "values" is the input series and how it should be encoded (comma-separated, JSON array, etc.) or what units/form the "window" takes. The words "rolling" and "max" hint at the meaning at best.

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?

"Rolling Max: Maximum of rolling" is essentially a restatement of the tool name rather than a definition; it never says it computes the maximum over each sliding window of a numeric series. With dozens of numeric siblings (x402-rolling-min, x402-cumulative-max, x402-find-max, x402-moving-average), the description gives no basis for distinguishing 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 statement of when to use this tool versus alternatives such as rolling-min, cumulative-max, or find-max. The only extra sentence concerns free trial calls per signed wallet, which is commercial context, not usage guidance.

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