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

With no annotations, the description carries the behavioral disclosure burden. It accurately describes the pure computation (find minimum, return smallest element), but does not address edge cases such as empty arrays, duplicate values, non-numeric entries, or whether the input array is modified.

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?

The description is short and front-loaded with the core purpose. The 'Find Min:' prefix is redundant with the tool name, but the rest is efficient and easy to parse.

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 min-finding tool, the description captures the basic operation, but the contradiction between the stated values-array parameter and the empty schema leaves the agent unable to invoke it correctly. It also lacks edge-case behavior and any return format details, which are not covered by an output schema.

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 description explicitly says 'Provide values array,' but the input schema declares zero properties. An agent following the description cannot construct a valid call because the schema does not accept a values array parameter. This is a direct mismatch between described usage and actual schema.

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 clearly states the action: find the minimum value in an array and return the smallest element. It distinguishes itself from siblings like x402-find-max and x402-find-min-index by focusing on the minimum value itself, though it does not explicitly name 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?

It tells the caller to provide a values array, but gives no guidance on when to choose this tool over the many related sibling tools such as x402-find, x402-find-max, or x402-find-min-index. No exclusions or alternative routing is provided.

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