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 almost nothing: no accepted date format, no output format, no timezone or leap-year/DST handling, and no note on whether the input is mutated or a new date returned. It only confirms the operation is addition.

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 single sentence is short, but half of it is a verbatim restatement of the tool name, and the remainder is under-specified rather than concise. Nothing here earns its place beyond the name itself.

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 date-arithmetic utility with no annotations, no output schema, and uninformative parameter descriptions, the definition is far too thin. An agent cannot know the expected date format, the return shape, or how day arithmetic handles month/year and leap-year boundaries.

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%, but the descriptions are placeholders ('N to process', 'Date to process', 'Days to process') that convey no semantics. The description adds nothing to clarify what n vs. days means, what date formats are accepted, or whether days may be negative.

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?

States a clear verb+resource ('Add days to a date'), which is more than a bare tautology. However, the lead-in repeats the tool name verbatim, and with dense siblings like x402-add-business-days, x402-add-months, x402-add-years, and x402-date-math, the description does nothing to distinguish this tool 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 and no mention of alternatives, despite an obvious cluster of near-identical date-arithmetic siblings (add-business-days, add-hours, add-months, add-years, date-math). The agent is left to infer selection criteria entirely.

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