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 behavior disclosure. It fails to state whether the tool uses the current date, what input it expects, whether it accounts for holidays, or what it returns. The empty schema only adds confusion rather than clarifying behavior.

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 description is extremely short, but it is not concise in a useful way—it repeats the tool name verbatim. It wastes its only sentence on a tautology, adding no information while still occupying space.

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?

Given an empty input schema and no output schema, the description is the sole source of operational detail. It provides none, leaving the agent completely unable to infer what inputs to send or what output to expect. The presence of date-related sibling tools makes this ambiguity even more damaging.

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 input schema has zero parameters, so there are no parameter details to document. The 0-param baseline of 4 applies because nothing is left undocumented, though the description also fails to clarify the implicit date context.

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 'Prev Weekday: Prev Weekday' is a pure tautology that merely repeats the tool name. It does not specify what the tool does—whether it computes the previous weekday from the current date, from a supplied date, or something else.

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 on when to use this tool instead of alternatives. With siblings like x402-next-weekday, x402-day-of-week, and x402-add-business-days, an agent has no way to decide which tool fits the task.

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