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

No annotations are provided, so the description carries the full disclosure burden, and it discloses nothing about computation behavior, sign conventions, expected units, or error handling. For a financial calculation with no structured behavioral hints, this is a complete gap.

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?

It is extremely short, but the brevity is redundancy rather than economy: the two tokens are identical and front-load nothing useful. Under-specification, not conciseness.

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?

Five parameters, zero required, no annotations, no output schema, and a description that says nothing. An agent cannot correctly compute or even reliably invoke this tool from the definition provided.

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?

Although schema coverage is nominally 100%, every parameter description is a tautology of the form "N to process" / "Pv to process", adding zero meaning beyond the key name. Worse, the tool has both "pv" and "present" plus an unexplained "n", creating genuine ambiguity about which inputs are expected and whether they are mutually exclusive.

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?

"Future Value: Future Value" merely restates the tool name and adds no verb, resource detail, or distinguishing information. A sibling like x402-present-value or x402-annuity-fv is indistinguishable from this tool based on the description alone.

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?

There is no when-to-use guidance, no mention of prerequisites, and no reference to related tools such as x402-present-value, x402-compound-interest, or x402-annuity-fv. The agent is given nothing to route on.

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