Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full disclosure burden, yet it states nothing about output format, defaults when 'date' is omitted, timezone handling, or whether the operation is read-only. The sole sentence conveys no behavioral information.

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 the brevity comes from under-specification rather than efficiency: the single sentence repeats the tool name verbatim and contributes zero information. There is nothing 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?

With no output schema, no annotations, and an undocumented optional 'date' parameter whose absence behavior is unclear, the description leaves an agent without enough information to invoke the tool correctly. All behavioral burden is unmet.

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 the single 'date' parameter is documented in the schema as 'Date to process', so the baseline of 3 applies. The description adds nothing beyond the schema, but it doesn't need to compensate for missing coverage.

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 Year: Next Year" is a tautology that merely restates the tool name, adding no verb, resource detail, or scope. An agent cannot tell from this whether it returns the next calendar year, advances a supplied date by a year, or computes a year-end value.

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 or when to prefer alternatives such as x402-add-years, x402-next-month, or x402-year-start. The agent is left to guess entirely from the name.

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