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

The annotation destructiveHint=true already signals that this operation has side effects. The description adds the context that it emails the account owner and lists report types, but it does not disclose additional behavioral traits such as whether an email record is created, costs, or irreversibility. Since annotations provide the baseline, a score of 3 is appropriate.

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 two short sentences, front-loaded with the primary action and purpose, and then concisely lists the available report types. No unnecessary words or repetitions.

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 low-complexity tool with no output schema, the description covers the essential behavior (generate and send email), the recipient, and the available types. Together with the schema and annotations, the tool is well-specified. Minor gaps include no mention of possible errors or delivery timing, but these are not critical for this simple action.

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 100%, so the parameters are well-documented in the schema itself. The description lists the report types which match the tipo enum, but this is redundant with the schema and adds no new semantic detail about parameters like periodo or empresaId beyond what the schema already provides.

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 generates and sends a financial/tax report by email to the account owner, and lists the supported report types (resumo_diario, fluxo_caixa, inadimplencia, compliance, dre). This provides a specific verb+resource+scope and distinguishes it from sibling tools like consultar_dre or dashboard_executivo.

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 usage (when you need to send one of the listed report types by email) but does not explicitly state when to use this tool versus alternatives like agendar_cobranca or enviar_lembrete_cobranca. No exclusions or alternative guidance is provided.

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