Criar Cartão de Crédito

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

Annotations already mark destructiveHint:true. The description adds that it is a write operation and requires confirm:true, which is consistent. However, it does not elaborate on side effects or permissions beyond that.

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?

Two short sentences, front-loaded with key info (write operation, manual creation, confirm requirement). However, it omits important details, making it slightly less efficient.

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 9 parameters, low schema coverage, and an output schema, the description is incomplete. It lacks parameter explanations, output description, and usage context for a destructive operation.

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?

With only 22% schema description coverage, the description should explain parameters. It provides no info on any parameter beyond hinting confirm must be true. The schema itself underspecifies parameters, and the description does not compensate.

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 it creates a credit card manually ('Cria um cartão de crédito manual'), with the verb and resource explicit. It distinguishes from sibling tools like update_credit_card by the create action, yet could note that other create tools exist.

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 on when to use this tool over alternatives like creating an account or transaction. The description only states it is a write operation and requires confirm:true, but does not specify prerequisites or when not to use it.

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