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

With no annotations, the description carries the full burden of disclosing behavior, but it reveals nothing: no read/write behavior, no validation semantics, no output format, no error cases. The description is purely tautological.

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?

The description is extremely short but that is under-specification, not conciseness. The repeated phrase earns no place and provides no operational information.

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 optional parameters, an agent has no way to know what inputs are expected or what the tool returns. The description is completely inadequate for correct tool selection or 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 coverage is 100%, so the baseline is 3 even without parameter details in the description. However, the schema itself only says 'Bic to process', 'Code to process', and 'Swift to process', and the description adds no meaning about relationships, formats, or which parameter matters.

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 description is a verbatim restatement of the tool name ('SWIFT Code: SWIFT Code'), with no verb, no operation, and no explanation of what the tool actually does. It does not distinguish itself from related siblings like x402-is-swift-bic or x402-bic-lookup.

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 tool, what problem it solves, or which alternative should be preferred. An agent cannot tell whether to call this, x402-is-swift-bic, or x402-bic-lookup for a SWIFT-related task.

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