paper_size_reference

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

No annotations are provided, so the description must disclose behavioral traits. The only behavioral disclosure is the cost 'Costs $0.001 USDC via x402', which is a payment trait. However, it does not describe what the tool does, what it returns, side effects, or any other behavior. This is minimal transparency.

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 very short but under-specified rather than concise. It uses only a few words without substance, lacking an introductory verb or explanatory clause. Every word should earn its place, but here 'Other Utilities tool' is filler and the cost information is the only non-redundant part.

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 reference tool with no output schema and a generic input schema, the description should explain what paper size information is provided, the format of results, and how to use it. The description offers none of this, leaving the agent without enough context to invoke the tool correctly. Even considering the cost disclosure, the description is severely 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?

The input schema has a single 'params' object described as 'Tool parameters as JSON object', which provides no semantic meaning about what parameters are actually expected. The description adds no clarification on what information should be passed (e.g., paper size name, dimensions). Despite high schema coverage, the schema description is a placeholder, so the description fails to compensate.

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 'paper size reference' essentially restates the tool name without a specific verb or detailed resource. It mentions 'Other Utilities tool', which is a category, not a distinguishing function. There is no statement of what the tool does with paper sizes, making it a tautology with minimal added meaning.

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 provides no guidance on when to use this tool versus alternatives. It only mentions a cost and the generic category, with no mention of use cases, exclusions, or comparisons to sibling tools like convert_units or dns_lookup.

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