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

No annotations are available, so the description carries the full burden of behavioral disclosure, but it discloses nothing. It does not state whether the tool computes a formula, what assumptions it uses, what it returns, or whether it requires a discount rate and cash flow schedule.

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 text is extremely short, but this is under-specification rather than effective conciseness. Repeating the term 'Present Value' adds no information and does not justify its placement at the beginning of the description.

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 financial calculation tool with no annotations, no output schema, and many financial sibling tools, the description is completely inadequate. It fails to explain the calculation, input requirements, return value, or relationship to other present-value-related tools.

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 declares zero parameters, so there are no parameter semantics for the description to explain. While the description itself contributes nothing, the absence of parameters means no additional parameter documentation is needed for invocation.

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 is 'Present Value: Present Value', which merely restates the tool name and title without adding a verb or defining what the tool actually does. It does not say whether it calculates, explains, or formats present value, and it cannot be distinguished from related tools like x402-future-value or x402-npv-calc.

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 no guidance on when to use this tool or when to prefer an alternative. There is no mention of applicable scenarios, exclusions, or sibling tools, so an agent has no basis for selecting this over x402-future-value or x402-annuity-pv.

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