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, and it discloses nothing: not whether this is a pure computation, what it returns, how the window is interpreted, or what happens with insufficient values. The name hints at a statistic but nothing is confirmed.

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, but brevity here reflects under-specification rather than economy. The two identical clauses add no information and nothing is front-loaded because there is nothing to front-load.

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 parametrized statistical tool with no annotations and no output schema, the description supplies none of the context an agent needs: input format, window semantics, or result shape. It is not complete in any meaningful sense.

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 nominally 100%, so per the scoring baseline the schema is credited with documenting both parameters. However, the schema text itself is boilerplate ("Values to process", "Window to process") and neither schema nor description explains the expected format of values or the meaning of window, so this sits at the low end of the baseline band.

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 "Moving Std: Moving Std" merely restates the tool name twice. It names no verb and no resource, giving no indication of what is computed or returned (a moving standard deviation, presumably). With hundreds of x402-* siblings, this provides zero differentiation.

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 mention of prerequisites, and no reference to alternatives such as x402-stddev, x402-moving-average, or x402-rolling-max. The agent is given nothing to route on.

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