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

No annotations are provided, so the description carries the full burden, yet it discloses nothing about behavior: input format, ordering direction, stability, handling of duplicates, or error cases. The name implies a pure computation, but that is inference, not disclosure.

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?

It is short, but this is under-specification rather than conciseness: the entire description is a redundant echo of the title with zero informational content. Brevity here does not earn its 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?

With no annotations, no output schema, and only a vague single-parameter schema, the description should explain input format and return shape. It supplies none of that, leaving the tool effectively unusable without trial and error.

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?

There is a single parameter with 100% schema description coverage, so per the rubric the baseline is 3. The schema's own text ('Values to process') is vague and the description adds nothing about expected format (comma-separated? array-like?), but the schema is the designated source here.

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 'Merge Sort: Merge Sort' merely restates the tool name, a tautology with no verb, resource, or output statement. An agent can infer it is a merge-sort algorithm, but nothing distinguishes it from siblings like x402-quick-sort, x402-bubble-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?

No when-to-use guidance, no prerequisites, and no mention of the many sorting alternatives in the sibling list. The agent is left to guess when this tool is appropriate.

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