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

The description states it uses official sources, is hosted by the platform, and emphasizes data privacy and LGPD compliance. It also notes that no platform credentials are required. However, it does not describe the exact behavior of the download (e.g., whether it returns a file, what format) or any potential side effects beyond payment.

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 somewhat verbose and repetitive, with multiple sentences that could be condensed. It repeats the idea of official source and data privacy, making it less concise than necessary.

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?

The description lacks essential details such as the meaning of parameters, expected output, and how the tool fits into the overall workflow. It does not mention the return format or any constraints, leaving the agent with insufficient information to invoke it correctly.

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?

The description provides no information about the parameters (cnpj, ano_mes, login_cpf, login_senha, fornecimento) or how they should be used. Since the schema has no descriptions, the agent has to guess what each field means.

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 it is for downloading an account from SABESP via an official source, which is a specific action. However, it could be more precise about the exact type of account (e.g., bill, statement) but overall it conveys the primary function.

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 does not provide guidance on when to use this tool compared to other tools. It mentions that it requires login credentials and payment, but does not explain the scenario for using this tool over alternatives like 'authenticate' or 'connect'.

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