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

The annotations already indicate readOnlyHint=false and idempotentHint=false. The description adds the explicit '[write, altera dados]' signal, which usefully confirms mutation, but it does not disclose other behavioral aspects such as required authentication, what data is changed, or any side effects. This is adequate but not rich.

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 compact sentence that front-loads the category and action, includes the endpoint, and flags mutation behavior. There is no wasted text, though the endpoint and write flag are somewhat redundant with the action and PUT verb.

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, no parameter descriptions, and no usage guidance, the description is far from complete. An agent would know the tool adds tags, but would not know how to populate body, query, or account, what the response contains, or whether prerequisites exist. This is insufficient for reliable 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?

The input schema has three opaque string parameters (body, query, account) with 0% schema description coverage, and the description provides no explanation of what these parameters mean, what format they expect, or which are required. The description does not compensate for the schema gap at all, so the agent has no basis to construct a correct invocation.

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 ('Adicionar etiquetas' / add tags) and a concrete resource via the endpoint PUT /arquivos/adicionaretiqueta, and situates it under 'Despesas / Etiquetas'. It is clear enough for an agent to understand the tool's function, and the action differentiates it from the remove-tag sibling, though it does not explicitly name sibling alternatives.

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?

There is no guidance on when to use this tool versus alternatives such as superlogica_arquivos_removeetiqueta or superlogica_arquivos_etiquetas. The description provides only a category and action, leaving the agent to infer invocation context.

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