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

With no annotations provided, the description partially compensates by revealing the return format (result_id, engine_version, disclaimer) and mention of Monte Carlo simulation. However, it does not disclose potential side effects, authorization requirements, or behavior for invalid inputs.

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 but includes some unnecessary technical details (e.g., 'Numeratica POST /v1/debt-payoff'). The first sentence 'Debt payoff.' is tautological and could be omitted. The structure is acceptable but not optimal.

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 the lack of output schema and parameter descriptions, the description fails to provide a complete picture. It does not explain what the tool computes, how to interpret results, or what the 'strategy' parameter expects. Many sibling tools provide more context.

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 coverage is 0% and the description provides no explanation of the parameters. The instruction 'See the input schema for the accepted fields' adds no value beyond the schema itself. For a tool with 3 parameters, this is insufficient.

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 name 'debt_payoff' and description clearly indicate a debt payoff calculation tool. It mentions the endpoint and expected return fields, distinguishing it from siblings like debt_vs_invest. However, the exact nature of the output (e.g., payoff plan or time to payoff) is not explicitly stated, preventing a 5.

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?

No guidance on when to use this tool versus alternatives such as debt_vs_invest or loan_amortization. The description lacks any context about prerequisites, constraints, or when not to use it.

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