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

No annotations are provided, so the description carries the full burden of disclosing behavior. It discloses nothing: no side effects, return type, error behavior, or processing semantics. The name alone cannot tell an agent whether this is a predicate, a generator, or a validator.

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?

Although the description is extremely short, this is under-specification rather than effective conciseness. The phrase simply duplicates the tool name and contributes no new information, so it 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?

For a zero-parameter tool with no output schema and no annotations, the description is the only source of context, and it is completely uninformative. An agent cannot determine whether this tool returns a sorted array, checks if input is sorted, or provides metadata about a sorted-array data structure.

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 tool has zero parameters and the schema is empty, so there are no parameter semantics to explain. The description adds no meaning, but because no parameters exist, the schema fully covers this dimension and the baseline 4 applies.

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 'Sorted Array: Sorted Array' is a pure tautology that restates the tool name without any verb, action, or resource. It provides no information about what the tool does, what a sorted array means here, or how it relates to the many sibling tools.

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 about when to use this tool, what problem it solves, or how it compares to alternatives such as x402-sort-numbers, x402-is-sorted, or x402-array utilities. The empty description leaves the agent with no basis for selecting or avoiding this tool.

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