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

No annotations are provided, so the description carries the full burden. It usefully discloses the cost model (5 free trial calls per signed wallet), implying payment/signing behavior, but says nothing about expected units, numeric format, error handling, or response shape for a physics calculation.

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?

Front-loaded single sentence that puts the formula first, with the trial/pricing note kept short at the end. No filler beyond the emoji promo line.

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 two-parameter numeric calculator with no output schema, the formula effectively defines the return value (reactance), so the core is complete. However, the missing unit conventions and the string-typed inputs leave a real gap for correct invocation.

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 description coverage is 0% and both parameters are untyped strings with no descriptions. The description only echoes the parameter names as variables in the formula; it adds no unit semantics (Hz? Farads?) or format guidance, which is critical for a reactance formula to be callable correctly.

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?

It states a precise verb+resource and even gives the exact formula (1 over 2*pi*frequency*capacitance), so the computation is unambiguous. It implicitly separates itself from the nearby x402-inductive-reactance sibling via the name and definition, but never explicitly contrasts them.

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 prerequisites, and no mention of alternative tools such as x402-inductive-reactance or x402-ohms-law-*. The only context is a promotional note about 5 free trial calls, which does not help the agent decide when to select this tool.

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