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

No annotations exist, so the description carries the full burden of behavioral disclosure, and it reveals nothing. It does not explain how the tool receives a date (the schema declares zero parameters), what output format is produced, what the default behavior is, or anything about locale, timezone, or edge cases. "Format date" discloses nothing beyond the name itself.

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?

At just four words, the description is tiny but the content is entirely redundant with the tool name — this is under-specification, not conciseness. "Format date" does the same work the name x402-format-date already does, so none of the words earn their place.

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?

A date-formatting tool that declares zero parameters, has no annotations, and no output schema is fundamentally incomplete: the agent has no way to know what input to provide, what format to expect, or even how the date is supplied. The description fails to address any of the information needed to invoke the 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?

The schema has zero parameters and 100% coverage, so by the rubric the baseline is 4 — there is literally no parameter information for the description to supplement. The description's mention of "date" subtly implies an expected input concept, though no parameter is formally declared.

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 "Format Date: Format date." is a pure tautology — it restates the tool name using the same two words without adding any information. It gives no detail about what formatting operation is performed, making it indistinguishable from the many date-related siblings such as x402-parse-date, x402-date-to-epoch, and x402-format-y-y-y-y-m-m-d-d.

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?

The description provides zero guidance on when to use this tool versus alternatives like x402-format-d-d-m-m-y-y-y-y, x402-format-m-m-d-d-y-y-y-y, or x402-format-time24. No context, prerequisites, exclusions, or selection criteria are mentioned anywhere.

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