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. It does not state what is returned, whether inputs are validated, whether output is a simplified ratio vs decimal, or any other behavioral trait. It only confirms the general domain.

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?

Extremely short — one redundant fragment. It is concise but not informative; the brevity reflects under-specification rather than well-edited 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?

For a 2-parameter calculation tool with no annotations and no output schema, the description provides essentially nothing an agent needs: no input format, no output format, no units, no edge-case behavior, and no distinction from the sibling 'x402-aspect-ratio-calc'. Critically incomplete.

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?

Schema description coverage is 100% — both 'width' and 'height' are described in the schema. The description adds no parameter semantics beyond the schema. Per guidelines, baseline 3 applies when schema coverage is high. Note: both params are typed as string, which is unusual for numeric dimensions, and neither schema nor description clarifies format expectations.

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 'Aspect Ratio: Aspect ratio calculation' restates the tool name with a marginal addition ('calculation'). It is essentially a tautology — the title is nearly identical to the description text. An agent can infer the resource (aspect ratio) but learns nothing extra about what specifically is computed.

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?

No usage guidance whatsoever. There is a sibling tool 'x402-aspect-ratio-calc' in the list, making this ambiguity especially problematic — the description provides no routing information to distinguish between the two.

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