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 behavioral disclosure, and it discloses nothing: not the parsing of the input, not the return shape, not behavior on ties, empty input, or multiple minima.

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 and front-loaded, but the single sentence is pure redundancy with the name and earns no place; this is under-specification masquerading as conciseness, matching the LOW calibration pattern.

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 tool whose input is an ambiguous string of values and whose output (an index) is far from obvious, the description provides nothing about input format, output format, or edge-case behavior. No output schema exists to fill the gap.

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?

Only one parameter exists and schema description coverage is 100%, so per the baseline rule a 3 applies even though the description adds no parameter meaning. The schema's own description ('Values to process') is itself vague, but the description does not compensate for or worsen it.

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 is a near-verbatim restatement of the tool name ('Find Min Index: Find min index') with no elaboration. It does not clarify what 'min index' means (index of the minimum value in a sequence), what form the input takes, or how it differs from siblings like x402-find-min, x402-find-max-index, or x402-find.

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 when-to-use guidance, no prerequisites, and no mention of any alternative. Among hundreds of sibling tools including x402-find-min (which presumably returns the value rather than the index), no disambiguation is offered.

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