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. The description discloses nothing: no effect, no inputs, no outputs, no side effects, no preconditions. It is entirely non-informative about the tool's runtime behavior.

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, but it is not meaningfully concise—it merely repeats the tool name, wasting the available space. A proper tool description would invest this length in explaining functionality. This is under-specification, not conciseness.

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?

Given no annotations, no output schema, and a tautological description, the agent has absolutely no understanding of what this tool does, how to call it, or what to expect in return. Even for a zero-parameter helper, a minimal functional description is required; none is present.

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?

With 0 parameters and an empty schema, there are no parameter semantics to document. The baseline for 0-param tools is 4 since the schema covers everything there is to cover. The description does not need to add parameter meaning because no parameters exist.

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 'Decrease By Percent: Decrease By Percent' is a pure tautology—it restates the tool name without adding any action, resource, scope, or behavior. There is no verb-object structure that tells an agent what this tool actually does, and it is indistinguishable from sibling tools like x402-increase-by-percent or x402-percent.

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?

The description gives zero guidance on when to use this tool versus alternatives. Notably, the sibling list includes x402-increase-by-percent, x402-percentage-change, and x402-percent, but no distinction is drawn. An agent cannot decide between these tools based on this description.

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