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, yet it discloses nothing about how the average is computed, how the output is shaped, how short inputs are handled, or what errors can occur. The only extra information is a payment/auth note about signed wallets.

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 shortness here comes from under-specification rather than discipline. Half of the content is an emoji-prefixed promotional line that does not help an agent invoke the tool.

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 four-parameter numeric tool with no annotations, no output schema and no schema descriptions, the description leaves essentially everything an agent needs unspecified. It is not complete enough to support 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?

All four parameters (data, period, values, window) are bare strings with 0% schema description coverage and none required. The description does not clarify the apparent overlap between data and values, or between period and window, leaving an agent unable to know what to send.

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?

"Average of moving" is a circular restatement of the tool name and does not identify the resource or the operation in a meaningful way. With close siblings like x402-sma, x402-ema, x402-moving-sum and x402-moving-std present, the description offers no basis for telling this apart 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 at all, and no named alternative such as x402-sma for a simple average or x402-ema for weighted recency. The only contextual sentence concerns free trial calls per signed wallet, which is a billing note rather than usage instruction.

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