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

Annotations already declare readOnlyHint=true and idempotentHint=true, so the safety profile is known. The description adds valuable context beyond the annotations: the query is hosted without credentials, requires prepaid credits, accesses public data, and places LGPD responsibility on the client. This enriches the agent's understanding of operational and legal behavior.

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 reasonably concise for the amount of context it provides. It starts with the core purpose, then details payment, credentials, data nature, and LGPD. While it could be trimmed, each sentence adds meaningful operational or legal context, and the structure is logical.

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 simple read-only tool with no output schema, the description covers the main purpose, payment model, and legal framing. However, it omits explanation of the 'completo' parameter and doesn't mention the response format or error behavior, leaving some important gaps for an agent deciding how to invoke the tool.

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 0% schema description coverage, the description must compensate. It explains that the query is based on CPF, which covers the 'Cpf' parameter, but it does not explain the 'completo' boolean parameter at all. The phrase 'dados associados' is vague and doesn't clarify what 'completo' changes, leaving 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 action ('Consulta o número do PIS e dados associados de uma pessoa a partir do CPF') with a clear resource (PIS data from CPF) and source (Ministério do Trabalho). It distinguishes itself from sibling tools, which are unrelated (authenticate, connect, marketplace, etc.).

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 gives clear context for when to use the tool: prepaid credit, no credentials required, and it queries public-access information. It doesn't explicitly mention alternatives or exclusions, but the context is sufficient to infer appropriate usage.

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