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

With no annotations provided, the description carries the full burden of behavioral disclosure, and it discloses nothing. It does not state supported units, input formats, output shape, error behavior, or whether any conversion direction is assumed.

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 text is short, but this is under-specification rather than conciseness. It contains no front-loaded information and the words 'Speed of convert' are grammatically garbled and semantically empty.

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 tool with 3 parameters, no output schema, no annotations, and dozens of closely related siblings (x402-speed-to-kph, x402-units-convert, x402-temperature-convert), the definition is severely incomplete. An agent cannot determine what units are supported, what the result looks like, or how this tool differs from alternatives.

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 nominally 100%, but each parameter description ('To to process', 'From to process', 'Value to process') is a vacuous template that just repeats the parameter name. The tool description adds no meaning about unit formats or valid value syntax, so an agent cannot reliably populate these fields.

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 'Speed Convert: Speed of convert.' is a tautology that merely restates the tool name without specifying a verb, resource, or scope. It does not clarify whether this converts speed units, measures conversion speed, or something else entirely, and it is indistinguishable from siblings like x402-speed-to-kph, x402-speed, and x402-units-convert.

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 versus the many similar conversion tools among its siblings. No conditions, no exclusions, and no mention of alternatives are provided.

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