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

Annotations already indicate destructiveHint: true, and the description adds some context by specifying immediate receipt and Asaas integration. However, it does not disclose any side effects or irreversible actions beyond what the hint implies, leaving room for more behavioral detail.

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 a single, front-loaded sentence that directly states the tool's purpose without any filler. It is concise and efficiently conveys the 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?

For a simple creation tool, the description provides the core purpose and mentions the output (QR Code). However, it lacks details about return values, prerequisites, or any post-creation behavior, which would make it more complete. The 100% schema coverage mitigates parameter gaps, but overall the description is minimal.

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 has 100% description coverage for all six parameters, so the description does not need to add parameter explanations. It adds no extra semantic value beyond the schema, matching the baseline.

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 tool creates a Pix charge (QR Code) for immediate receipt via Asaas. This specific verb+resource combination distinguishes it from sibling tools like criar_cobranca (generic create) and agendar_cobranca (scheduled).

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?

No guidance is provided on when to use this tool versus alternatives. The description does not mention exclusions, prerequisites, or explicit comparisons to similar sibling tools such as criar_cobranca or agendar_cobranca.

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