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/behavioral profile is largely covered. The description adds that the output is split into depreciation, finance charge and tax, which is genuinely useful behavioral context beyond the annotations, but no output schema exists to specify the return shape further.

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?

Single front-loaded sentence that lists inputs and the output decomposition, followed by a short URL. Efficient and well-structured, though the lengthy input enumeration slightly crowds the sentence.

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?

Given 10 parameters with full schema coverage, no output schema, and annotations declaring a safe read-only operation, the description covers the essential input semantics and output decomposition. It could better signal the rateType/mf-vs-apr relationship or clarify lease-specific behavior versus loans, but the schema carries most of the load.

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 all 10 parameters including the mf/apr relationship and rateType enum. The description merely lists parameter names without adding syntax, defaults, or format details beyond what the schema provides; 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 (car lease payment calculation) and enumerates the exact inputs used (price, MSRP, residual, money factor or APR, term, sales tax). The tool is clearly distinguishable from auto_loan_calculator and other siblings by naming the lease-specific decomposition into depreciation, finance charge and tax.

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 phrase 'to check a dealer quote' implies a usage scenario but does not explicitly state when to use this tool versus siblings like auto_loan_calculator or down_payment_calculator. No when-not-to-use guidance or alternatives are named.

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