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

No annotations are provided, so the description carries the full burden, yet it discloses nothing about behavior. It does not say whether the result is boolean, what counts as a valid SWIFT BIC, or how errors are handled.

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 the content is a redundant duplication of the same phrase rather than a front-loaded, informative sentence. Nothing is gained from the second clause.

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 simple single-input predicate tool with no output schema, the definition should at minimum state that it validates a SWIFT BIC and returns a yes/no result. None of that is present.

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 100% and there is only one parameter, so the baseline is 3. The description adds no meaning beyond the schema's generic 'Value to process' label, but the schema does carry the definition.

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 text 'Is SWIFT BIC: Is SWIFT BIC' merely restates the tool name twice, adding no verb+resource specificity beyond what the name already implies. It hints at a validation/predicate check but never actually states what the tool does.

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 guidance on when to use this versus the many overlapping siblings such as x402-bic-lookup, x402-swift-code, or x402-iban-validate. No inputs, prerequisites, or exclusions are described.

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