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

With no annotations provided, the description carries the full burden, but it only says 'convert between data size units.' It does not disclose the direction of conversion, whether the result is returned in a particular unit, what formats are accepted, or how the two parameters interact. This is minimally informative but not misleading.

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 a single concise sentence with no real padding. The leading 'Data Size:' label is slightly redundant with the tool name, but overall the length is appropriate and the core function is immediately visible.

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 simple two-parameter conversion tool, the description is under-specified: it does not explain the required input format, what each parameter means, or what output unit to expect. Given no output schema and no annotations, an agent would likely need additional examples or clarifications 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 coverage is 100%, the parameter descriptions are essentially placeholders ('From to process', 'Value to process') and add almost no meaning. The tool description does not clarify what should go in `from` versus `value`, or how the unit names map to parameters, so an agent cannot reliably construct a valid call from the provided information.

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 clearly states a verb ('Convert') and a resource ('between data size units'), with explicit examples of the units involved (KB, MB, GB). It is understandable and distinct from purely formatting or humanizing tools, though it does not explicitly differentiate itself from the many sibling conversion tools.

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 is given on when to use this tool over alternatives like x402-gb-to-mb, x402-mb-to-gb, x402-data-size-humanize, or x402-units-convert. The description gives no context for choosing this specific converter, so an agent has to infer its role from the name alone.

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