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

With no annotations, the description carries the full burden of behavioral disclosure. It does disclose the two main behaviors: computing the monthly DAS value and checking whether revenue is within the limit. However, it does not describe the output format, the specific annual limit used, or how activity choices affect the tax breakdown beyond what the schema already states.

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 short and front-loaded with the core purpose. The second and third sentences clearly organize required vs optional parameters and reinforce exact naming. It is slightly redundant with the schema, but no sentence is wasted.

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?

There is no output schema, so the description should clarify what the tool returns, such as the DAS amount and a boolean indicating whether the revenue limit is respected. It also omits the annual revenue limit value and how it is derived. These are meaningful gaps for an agent deciding how to use the result.

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 schema already provides 100% parameter documentation, including the activity enum's tax implications and monthly_revenue's meaning. The description only restates which parameters are required/optional and instructs the agent to use exact English names, adding no substantive semantic information beyond the schema.

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 identifies the operation: it calculates the monthly DAS MEI amount and checks the revenue limit. It is specific enough to separate this tool from generic tax calculators, though it never explicitly names or contrasts sibling tools such as calculate_late_das or calculate_simples_nacional.

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 parameter-level instructions (required/optional) but no guidance about when to choose this tool over alternatives. It does not state prerequisites, exclusions, or situations in which another calculator would be more appropriate, so the agent is left to infer the context from the name and description.

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