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

Annotations already mark this as read-only, idempotent, and non-destructive. The description adds useful behavioral context beyond annotations: duplicate detection criteria and the default date range. 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?

Three short, purposeful sentences with no filler. The main behavior and criteria are front-loaded, followed by the use case and default behavior. Every sentence earns its place.

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 read-only duplicate finder with 4 optional parameters and no output schema, the description conveys the core purpose and default behavior adequately but leaves parameter semantics and return details underspecified. More detail would be needed for fully confident invocation.

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 for the 4 undocumented parameters. It only vaguely relates to start_date/end_date via 'Padrão: mês atual' and does not explain days_threshold, include_automatic, or date formats. This is a significant gap.

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 states a specific verb ('Encontra') and resource ('transações possivelmente duplicadas'), and defines the detection criteria: same value, similar description, and close dates. This clearly differentiates it from listing, searching, or finding installments/subscriptions.

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?

It clearly frames the intended use case: cleaning up double-entered transactions, and notes the default current-month window. It does not explicitly mention alternatives or when-not-to-use cases, so it misses the top tier.

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