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: not what inputs are expected (dates? years? strings?), not what is returned (boolean? object?), and not how comparison is performed. A tool named 'is-same-year' with two opaque string params is completely opaque here.

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?

Very short, but the brevity is under-specification rather than conciseness: the same four words are stated twice, separated by a colon, with zero informational content front-loaded.

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 annotations, no output schema, meaningless parameter names, and a large family of near-identical comparison siblings, the definition supplies none of the context an agent needs to call this tool correctly.

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?

Although schema description coverage is nominally 100%, the field descriptions are placeholder text — 'A to process' and 'B to process' — which conveys no semantics about what a and b should contain (years, ISO dates, timestamps). The description adds nothing to clarify them, so the schema does not actually resolve the ambiguity.

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 is a pure restatement of the name: "Is Same Year: Is Same Year". It adds no verb, resource, or scope beyond what the tool identifier already conveys, and gives no basis for telling it apart from x402-is-same-day or x402-is-same-month.

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, when not to, or which sibling (is-same-day, is-same-month, is-same-year) fits a given question. The agent must 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.