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

No annotations are provided, so the description must carry the burden. It explains the tool's effect (conversion, compounding impact) and implies outputs like final balance, but does not state assumptions, units, or limitations (e.g., max rate, years). This is adequate but not rich in behavioral disclosure.

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 brief and front-loaded, but the first clause repeats the title verbatim. The remaining sentences are efficient and informative, making it mostly concise with minor redundancy.

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?

With no output schema, the description should clarify what the agent can expect in response. It mentions 'final balance' and 'true annual yield' but does not state whether the tool returns a single number, an object, or formatted text. It also omits input constraints (e.g., rate cap, deposit limits) that are present in the schema, leaving some gaps for a 4-parameter tool.

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 adds some meaning by explaining that nominalRatePct is APR and listing compounding options (though it omits 'annually' from the enum). Basic semantics for deposit and years are conveyed by property names, but units and constraints are not explained.

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 uses a specific verb ('Convert') and specifies the resource ('nominal rate (APR) to APY') while also mentioning compounding frequency and final balance. This clearly distinguishes it from sibling calculators like compound_interest_calculator or roi_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 provides clear context: it is for converting APR to APY and analyzing how compounding frequency affects yield and balance. It does not explicitly name alternative tools or exclusion cases, but the use case is unambiguous for a calculator of this type.

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