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 discloses nothing. It does not say what is returned (a date string, an object, a month name), whether the input date is optional, or what happens if the date is omitted. For a tool with zero annotation coverage and no output schema, this is a complete failure of transparency.

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 short but that brevity is under-specification, not conciseness. It repeats the tool name twice with a colon and adds zero information. 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?

Given zero annotations, no output schema, and no usable description, an agent cannot determine what this tool returns or how to call it correctly. The single parameter is optional but the description does not explain the default behavior. The definition is functionally incomplete.

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 100% and there is a single parameter 'date' documented as 'Date to process'. The description adds no parameter information, but the baseline when schema coverage is high is 3. The description neither clarifies the expected format nor whether the parameter is optional, so no credit above baseline.

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 'Next Month: Next Month' is a near-tautology that restates the tool name without stating a verb, an operation, or a result. An agent sees the word 'next month' but cannot tell whether this returns a date, a month name, a range, or a count of days. Sibling tools like x402-next-weekday and x402-next-year exist, but the description does not differentiate 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?

No guidance whatsoever about when to use this tool versus x402-add-months, x402-next-year, x402-next-weekday, or x402-month-name. There is no stated context, no exclusions, and no alternative routing. The agent is left entirely to inference from the tool name.

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