generate_paybysquare

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

With no annotations present, the description carries the full disclosure burden. It explicitly discloses the main side effect—saving the QR code to a file—and the return behavior of providing a file path. It stops short of covering failure modes, overwrite behavior, or directory creation, so it is strong but not exhaustive.

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 concise and free of filler: it opens with the main action, then lists the required and recommended fields, then states the output behavior. Every sentence earns its place and the structure is easy for an agent to parse.

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 tool with a rich schema and no output schema, the description covers the essential guidance: what it generates, which fields matter most, and what it returns. Some gaps remain, such as not explicitly mentioning the required iban and not describing file-handling details, which prevents a perfect score.

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?

The input schema already documents all parameters and defaults at 100% coverage, so the baseline is 3. The description repeats the required beneficiaryName and recommended swift, but it does not add substantial new meaning beyond the schema, and it omits that iban is also required within the payment object.

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 states a specific verb and resource: generating a PayBySquare QR code PNG from payment data. This clearly distinguishes the tool from sibling tools such as decode_paybysquare, check_compliance, and verify_roundtrip, which serve different operations.

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?

The description gives the core use case and highlights required and recommended fields, but it does not explicitly state when to select this tool over its siblings or when not to use it. Usage context is implied by the generation purpose rather than fully spelled out.

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