create_pix_payment

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

No annotations are provided, so the description must carry the full burden. It discloses that a PIX payment is created and a QR code is involved, but does not mention whether the payment is charged immediately, what response to expect, permission requirements, or potential side effects. For a financial operation, this lack of behavioral detail is a significant gap.

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 clear sentence with no wasted words. It is appropriately concise, but could afford a bit more detail on behavior or return values without becoming bloated.

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 annotations. The tool has 7 parameters and performs a financial transaction, yet the description only states what it creates. It fails to explain prerequisites, return values, or edge cases, leaving the agent with insufficient context to use it confidently.

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 provides descriptions for all 7 parameters, achieving 100% coverage. The tool description itself adds no parameter-level meaning beyond the schema. Baseline 3 is appropriate since the schema does the heavy lifting.

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 ('Create') and identifies the exact resource ('PIX payment') plus a distinguishing feature ('with QR code'). This sets it apart from sibling tools like create_payment (generic) or create_payment_link (link-based).

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 name and description imply this is for PIX payments, but there is no explicit guidance on when to choose it over alternatives such as create_payment, batch_create_payments, or create_payment_link. The usage context is present only by inference.

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