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

With no annotations, the description carries the full disclosure burden. It usefully reveals output behavior: the month is decomposed by destination and non-applicable items are returned as 'skipped' with a reason. However, it says nothing about determinism, units, error conditions, or whether results are purely informational, leaving gaps for a 10-parameter tool.

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 purpose is front-loaded in the opening clause, followed by a dense but purposeful enumeration of the computation chain. It is a single long run-on paragraph, but given the complexity of the chained calculation, nearly every clause conveys a distinct computed output and 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 10-parameter, 6-required calculator with no annotations and no output schema, the description covers the input chain and sketches the output structure (decomposed month, skipped items with reasons). It is largely complete, though it does not describe the response shape or numeric formats in detail.

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 100%, so the schema already documents every parameter (activity enum, pró-labore, unit_cost, services_annex, etc.), establishing a baseline of 3. The description names the required inputs in prose but adds no syntax, units, or edge-case meaning beyond what the schema provides.

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 scenario ('Abri um negócio') and enumerates exactly what it computes: MEI ceiling check, Simples annex/DAS, Fator R between Anexos III and V, INSS/IRRF on pró-labore, price composition, and break-even. It reads as a chained simulation tool rather than a single calculator, which implicitly separates it from siblings like calculate_simples_nacional or calculate_fator_r, but it never names those siblings explicitly.

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 explicit when-to-use or when-not-to-use guidance, and no alternatives are named despite many adjacent calculators in the sibling list (calculate_break_even, advise_tax_regime, calculate_optimal_prolabore). The statement that it 'describes the two regimes, without choosing between them' hints at behavior rather than when to select this tool over others.

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