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

The description explicitly states '[write, altera dados]' and uses POST, confirming this is a mutating operation, which adds context beyond the readOnlyHint:false annotation. However, it discloses nothing about idempotency, side effects, or error behavior, so the added value is modest.

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 compact and front-loaded: it gives the domain, action, endpoint, and mutability marker in one short line with no filler. The brevity is mostly a strength, though it leaves out important parameter context.

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?

With three completely undocumented parameters and no output schema, the description is insufficient for reliable invocation. The domain and endpoint help orient the agent, but essential details about how to construct the request are missing.

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 0% and the description does not explain any of the three string parameters (body, query, account). An agent has no way to know what payload, query string, or account context is required to correctly invoke this tool.

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 ('Cadastrar') and identifies the resource ('dados de pagamento favorecido') plus the endpoint, making clear this tool creates favored-payment data in the expenses domain. It is distinguishable from the sibling list tool, though it does not explicitly contrast with it.

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 implies use when registering favored payment data, but it gives no explicit when-to-use guidance, no alternatives, and no prerequisites. With a large sibling list, the agent must infer when this tool is appropriate versus related tools.

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