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

Annotations already declare readOnlyHint=true, idempotentHint=true and openWorldHint=false, so the safety profile is covered. The description adds only a worked example; it does not mention that all inputs are optional/defaulted, that waste above ~15% is for diagonal/herringbone lay, or what the returned result contains.

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?

Two sentences, front-loaded with a concrete example, followed by the purpose and a reference URL. Little waste; the trailing URL is promotional but brief.

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?

There is no output schema, but the description does state the two outputs (boxes to buy, material cost) and demonstrates them numerically, which is enough for a 7-parameter, fully documented, zero-required-input calculator. It could additionally note that defaults apply when inputs are omitted.

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% and each parameter (box, unit, price, waste, width, length, currency) is already documented in-schema, including the diagonal/herringbone waste hint. The description restates only 10% waste and a box size, adding no syntax or defaulting behavior beyond the schema, so the baseline 3 applies.

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?

States a specific verb+resource: converting room dimensions into boxes of flooring to purchase plus material cost. The opening worked example (12x12 ft, 10% waste, 20 sq ft boxes → 8 boxes) makes the operation concrete and separates it from generic siblings like square_footage_calculator or area_calculator.

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?

Usage is implied by the worked example (a room-size-to-purchase-quantity scenario), but the description never states when to use this over area_calculator or square_footage_calculator, nor any exclusions or prerequisites. Adequate context, no explicit routing.

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