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

No annotations are provided, so the description carries the full behavioral disclosure burden. It only implies a read-only lookup and says nothing about output format, invalid input handling, data source, or network dependence. This is minimal behavioral transparency.

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 very short and front-loaded, but the 'BIC Lookup:' prefix duplicates the tool name and the sentence is too sparse to carry meaningful usage or parameter guidance. It is concise but at the expense of useful content.

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?

There is no output schema and no annotation context, yet the description does not explain what the lookup returns, how the parameters should be supplied, or what constitutes a valid BIC. With two optional-looking parameters, this is incomplete for reliable agent 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?

Although schema description coverage is marked at 100%, the parameter descriptions are tautological: 'Bic to process' and 'Code to process.' The tool description does not clarify the relationship between 'bic' and 'code', whether both are expected, or which parameter is required for a lookup.

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 uses a specific verb and resource: 'Look up a bank BIC/SWIFT code.' This clearly identifies the tool's domain and main action. However, it does not differentiate this tool from nearby siblings like x402-swift-code or x402-bin-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 versus alternatives such as x402-swift-code or x402-is-swift-bic. The description only states what the tool does, not the conditions under which it should be selected or called.

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