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

No annotations are provided, so the description carries the full burden. It discloses the output fields and that it produces an estimate. However, it does not mention limitations, assumptions, or the fact that money factor is a decimal (not an APR), nor does it state that the tool is a read-only calculation with no side effects.

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 two sentences, front-loaded, and every sentence provides useful information. It avoids redundancy and is appropriately sized for the tool's complexity.

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?

The description gives the core inputs and outputs but lacks parameter definitions, usage guidance, and any note about edge cases or assumptions. Given the absence of annotations and output schema, it is adequate but has clear gaps that could leave an agent uncertain about parameter semantics.

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 0%, and the description only lists parameter names without defining them. Terms like cap cost, residual, and money factor are not explained, nor are units or formats (e.g., money factor as decimal, sales tax as percentage). The description adds minimal value beyond the schema's property names.

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 clearly states the tool estimates monthly car lease payments using cap cost, residual, term, and money factor. It also lists the output breakdowns (depreciation/finance split, sales tax, APR), which distinguishes it from sibling tools like car_loan_calculator or lease_vs_buy_car_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?

The description implies use when you have lease-specific inputs like money factor, cap cost, and residual. However, it does not explicitly state when not to use this tool or mention alternative calculators (e.g., car_loan_calculator for loan payments). The context is clear but lacks exclusions.

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