simple_interest_calc

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

With no annotations, the description carries the full burden of behavioral disclosure. It does mention the cost ($0.001 USDC via x402), which is useful, but it does not explain that this is a read-only calculation, how inputs are provided, or what the output looks like. The behavioral trait of costing money is disclosed, but the core function behavior is only implied by the name.

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 concise and front-loaded with the name and cost. However, the first sentence is largely redundant with the tool name, and the overall structure provides minimal useful information. It is short but not efficiently informative.

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 functional calculator tool with no output schema and a vacuous input schema, the description is extremely incomplete. It fails to explain the calculation, the required parameters, or the return value. An agent cannot correctly invoke this tool based solely on the provided description.

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?

The input schema only has a generic 'params' object with a description 'Tool parameters as JSON object', providing no specific parameter details. Although schema coverage is marked as 100%, the schema itself lacks semantic information. The description adds no parameter meaning, leaving the agent without knowledge of expected inputs like principal, rate, or time.

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 'simple interest calc — Finance & Math tool' merely restates the tool name and adds a broad category. It lacks a verb or explicit statement of what the tool does (e.g., computes simple interest from principal, rate, and time). This is closer to a tautology than a clear purpose statement.

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 is provided about when to use this tool versus alternative finance/math tools like compound_interest or loan_calculator. The description does not state relevant use cases, prerequisites, or exclusions.

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