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

With no annotations, the description carries the full burden. It usefully discloses the monetization behavior ('5 free trial calls per signed wallet') and confirms a deterministic read-style return (sorted array), but says nothing about input format, error handling, sort stability, or what happens when the trial quota is exhausted.

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 front-loaded and short: the sort behavior is stated first, followed by the quota note. The emoji is decorative noise, but the overall size is appropriate for a single-parameter tool.

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 one-parameter utility with no output schema, the description covers purpose and return value adequately, but omits the input string format that an agent must know to call it correctly, and gives no fallback behavior for the quota limit.

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 0% schema description coverage and is typed as a bare string, yet the description only says 'a list of numbers' without explaining the expected string encoding (comma-separated, JSON array, whitespace-delimited). This leaves a real ambiguity that the schema does not resolve.

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 states a specific verb and resource ('Sorts a list of numbers ascending') and the return value ('returns the sorted array'), so the core purpose is unambiguous. However, with roughly a dozen sorting siblings (bubble-sort, quick-sort, heap-sort, sort-numbers, etc.), it never explains why an agent would pick merge 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?

There is no guidance on when to use this tool versus the many other sort tools, no stated preconditions, and no exclusions. The only contextual note is the free-trial quota, which is pricing information rather than usage guidance.

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