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

The annotations already mark readOnlyHint=false and destructiveHint=false; the description adds '[write, altera dados]' and the POST method, clearly indicating a data-mutating operation. Still, it does not disclose what data is altered, what records are generated, or whether the operation can be reversed.

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 concise line that front-loads the domain and action, making it easy to scan. The '[write, altera dados]' marker is somewhat redundant with annotations, but it is short and not distracting.

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 tool has no output schema, sparse annotations, and a minimal description. A caller cannot infer the required body content, the role of 'account', expected side effects, or error conditions, making the tool risky to invoke correctly without external documentation.

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?

Both parameters ('body', 'account') are undocumented in the schema and have 0% schema description coverage. The description does not mention either parameter or hint at their meaning, so the agent has no basis for constructing a correct request payload.

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 ('Gerar parcelas') and a domain resource ('Compras'), with the endpoint further reinforcing the operation. It differentiates from sibling gerar_parcelas tools for vendas, orcamentos, and ordens_servicos by naming 'Compras', though it does not elaborate on what parcelas creation entails.

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 'Compras:' prefix implies this tool is for purchase-related installment generation, and sibling gerar_parcelas tools give some contrast. However, there is no explicit guidance on when to prefer this tool, what prerequisites exist, or when another tool should be used instead.

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