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

No annotations are present, so the description carries the full burden of disclosing behavior. It discloses nothing: no mention of input source, sort order, mutability, output format, or side effects. The definition is essentially empty of behavioral information.

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 short and free of filler, but it earns no credit for conciseness because it simply restates the tool name. This reads as a placeholder rather than a deliberately concise definition.

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?

Given there is no input schema, no annotations, and no output schema, a complete description was essential to explain what the tool operates on and what it returns. This description provides none of that context, leaving the agent unable to call it 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 paramters, so there is nothing for the description/ schema to document; the baseline of 4 applies. Still, for a sorting tool one might expect an explanation of how data is supplied, but the absence of parameters is already captured by the empty schema.

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 'Selection Sort: Selection Sort' is a tautology that merely repeats the tool name. It does not state what the tool does with any input, what values it returns, or how it differs from sibling sorting tools such as x402-bubble-sort, x402-merge-sort, or x402-sort-numbers.

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 zero guidance on when to use this tool versus any of the dozens of sibling sorting utilities. An agent cannot infer from the description whether to select x402-selection-sort over x402-quick-sort or x402-nsertion-sort.

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