Iniciar pagamento Pix via Open Finance

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

Annotations already indicate destructiveHint=true, and the description adds that its conclusion can move values ('sua conclusão pode movimentar valores'), which aligns. However, it doesn't elaborate on other behavioral aspects like authorization steps or potential side effects, so it adds only marginal context beyond annotations.

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 concise with two sentences, no wasted words, and front-loads the core purpose. Every sentence contributes essential 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?

Given the complexity (nested objects, high parameter count) and the presence of an output schema, the description could benefit from mentioning the output or the authorization journey flow. It is adequate but leaves gaps about what happens after initiation.

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%, so the baseline is 3. The description does not provide additional meaning beyond what the schema already documents, such as explaining the structure of nested objects or the significance of specific fields like 'idParticipante'.

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 clearly states the specific action: initiating an immediate Pix payment via Open Finance and producing the corresponding authorization journey. It uses a specific verb ('Solicita a iniciação') and resource, distinguishing it from sibling tools like 'of_start_schedule_pix_payment'.

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 a hint about when to use it ('Use após definir o pagamento'), but does not explicitly mention when not to use it or provide alternatives like scheduled or recurring Pix payments. Without contrasting with siblings, the guidance is minimal.

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