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

With no annotations, the description carries the full burden. It does disclose the ordering direction, the return shape, and a trial quota/rate limit ('5 free trial calls per signed wallet'), which is genuine behavioral context. It says nothing about failure modes (non-numeric input, mixed types) or how the result is sized, which matters for an unannotated tool.

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?

One front-loaded sentence that delivers purpose, ordering, and return value before the promotional quota tag. Efficient, with only the trailing emoji/pricing fragment as marginal noise.

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 0% parameter documentation, the description would need to explain the input encoding and error behavior to be callable with confidence. It covers direction, return, and quota but leaves the single most important unknown — the 'values' format — unaddressed.

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 single parameter 'values' has no schema description (0% coverage) and is oddly not required, yet the description never clarifies the expected encoding — comma-separated numbers, JSON array, or a raw string. For a 0%-coverage parameter this is a material gap the description fails to close.

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?

States a specific verb and resource ('sorts values') with the algorithm named and the ordering direction ('ascending') plus the return ('ordered array'). The algorithm name intrinsically separates it from bubble-sort/merge-sort/quick-sort siblings, though the description never explains why an agent would pick insertion sort over those alternatives.

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 and no mention of sibling alternatives such as x402-sort-numbers, x402-sort-strings, or the other sort-algorithm tools. The agent must infer entirely on its own which sort variant applies.

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