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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and openWorld false, so the safety profile is covered. The description adds useful behavioral context by naming the included fee components and citing 46 CFR 67.550, though it does not explain return format or calculation assumptions beyond what the parameter schema provides.

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 a single front-loaded sentence with no filler, and it efficiently lists the relevant fee categories. It is dense but appropriately sized for the tool's scope.

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 read-only fee calculator with four optional, fully documented parameters and no output schema, the description gives enough domain context to call the tool correctly. It could be stronger by explicitly stating what the return value contains, such as a total and fee breakdown.

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%, so the schema already documents the meaning, rates, defaults, and constraints of all four parameters in detail. The description enumerates some corresponding fee components but adds little parameter-level meaning beyond the 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 states a specific calculation verb and resource: summing Coast Guard NVDC documentation fees for a financed recreational boat, with a legal citation and enumerated fee components. This is clearly distinguishable from the sibling tools for loans, sales tax, and lender terms.

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 implies usage by specifying a financed recreational boat and USCG documentation fees, but it does not explicitly say when to choose this tool over alternatives or when not to use it. The context is clear but not framed as guidance.

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