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

With no annotations, the description carries full behavioral disclosure but provides none: it does not mention input format expectations, validation rules, error behavior, or output beyond the format. It only restates the name.

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 extremely short but redundant: the name already says 'Format M M D D Y Y Y Y', and the description repeats it. It is not front-loaded with useful information; it's under-specified rather than concise.

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 formatting tool with one parameter and no annotations or output schema, the description is inadequate. It fails to explain what input format is expected (e.g., ISO date string, timestamp), how missing or invalid input is handled, or what the output looks like (though output schema is absent, the description could clarify).

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 coverage is 100%, so the schema fully documents the single 'date' parameter. The description adds no additional meaning about parameter format or constraints, so baseline 3 is appropriate.

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 states a specific verb (Format) and resource (M M D D Y Y Y Y) and clarifies the output format as MMDDYYYY. It is distinguishable from siblings like x402-format-d-d-m-m-y-y-y-y or x402-format-y-y-y-y-m-m-d-d by the explicit ordering. However, the wording is redundant with the name and could be more precise about input expectations.

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 on when to use this tool versus alternatives such as x402-format-date or other date formatting siblings. The description merely states its function without context or exclusions.

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