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

With no annotations, the description carries the full disclosure burden. It contributes one genuinely useful behavioral fact — a signed wallet is required and 5 free trial calls are available — but says nothing about how the computation works, what units or currency it assumes, whether results are deterministic, or what the response looks like.

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 short, but brevity here is under-specification rather than conciseness: the only substantive sentence is pricing marketing, and the actual purpose is compressed into a tautology.

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 three-parameter numeric tool with no annotations and no output schema, the definition supplies essentially none of the information an agent needs — no semantics for inputs, no result description, no sibling disambiguation — so it is not callable with confidence.

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?

All three parameters (value, years, inflation) have zero schema description coverage and the description adds no meaning: no units, no expected string formats, no statement of whether inflation is a percentage or a decimal, and no indication of which are optional since none are required.

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?

"Purchasing Power: Power of purchasing" merely restates the tool name in circular form; it never states what the tool computes or returns (a currency amount? an index?). Only the parameter names hint at an inflation-adjustment calculation, so an agent must infer the verb and resource from the schema rather than from the text.

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 when-to-use guidance, no prerequisites, and no reference to the many overlapping siblings such as x402-inflation-adj, x402-inflation-adjust, or x402-real-rate that an agent could easily confuse with this one.

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