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

No annotations are provided, so the description carries the disclosure burden. It adds the validation rule (8 or 11 character SWIFT/BIC format) and a payment/auth signal ('signed wallet'), which is genuine behavioral context, but says nothing about the return shape (boolean vs. parsed fields) or error behavior.

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?

A single front-loaded sentence that states purpose first. The trailing pricing/emoji clause is marketing noise rather than tool semantics, but it is brief.

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?

With no annotations, no output schema, and three undocumented optional parameters that look like synonyms, the description leaves too much unresolved — an agent cannot tell which parameter to populate or what a result looks like.

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 coverage is 0% and the description says nothing about the three parameters. It is unclear whether 'bic', 'code', and 'swift' are interchangeable aliases, whether any is required, or how they differ — a real gap given zero schema documentation.

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?

States a specific verb ('Validates') and resource ('SWIFT or BIC bank code') plus the format rule (8 or 11 characters), so the operation is unambiguous. It does not, however, distinguish itself from the very similar sibling x402-is-swift-bic, which appears to perform an overlapping validation.

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 on when to use this versus x402-is-swift-bic or x402-bic-lookup. The only contextual note is the pricing trial ('5 free trial calls per signed wallet'), which is commercial, not usage-oriented.

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