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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds useful context that the tool returns a receipt/status for a specific calendar year, but it does not disclose output format, possible status values, or any authentication/privacy behavior. No contradiction with 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 a single, front-loaded sentence with no filler or repetition. Every word contributes to identifying the tool's purpose and scope.

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 no output schema and no parameter descriptions, the description carries a heavy burden. It does not explain what 'situação' values might be, why 'birthdate' is required, or how this tool relates to authentication or sibling consultation tools. The description is too minimal to be fully actionable for an agent.

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%, so the description must compensate. It clarifies that 'cpf' and 'year' refer to a CPF and calendar year, but it does not explain the required 'birthdate' parameter at all, nor does it provide format expectations for any parameter. This is a significant gap for a 3-parameter 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 clearly identifies the resource (IRPF declaration for a CPF) and the kind of result (comprovante/situação), and the calendar-year scoping distinguishes it from sibling consultas tools. However, it lacks an explicit verb like 'consult' or 'retrieve', so it stops short of a 5.

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?

Usage is implied by the resource name and domain: it is the tool for IRPF declaration status. There is no explicit guidance about when to use it versus alternatives, no exclusions, and no mention of prerequisites such as authentication, so it only reaches the 'implied usage' level.

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