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

With no annotations, the description carries the full burden. It discloses that it is free, requires no key, provides no recommendation or judgment, and returns a ready-to-cite citation. This is meaningful behavioral context beyond the raw operation, though it does not mention rate limits or error handling.

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 detailed but well-structured, leading with the core summary, then listing specific metrics and the confidence flag, and ending with usage notes. It is not overly long for the information conveyed, though it could be slightly more concise.

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 single-parameter tool with no output schema, the description adequately explains the output: six numbers, three questions, a top sentence, and a citation. It covers key features like free access and no recommendation, but omits ticker format guidance and error behavior, which are minor gaps.

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 description coverage is 0%, and the description does not compensate by explaining the ticker parameter's format or constraints (e.g., B3 ticker like 'PETR4' vs 'PETR4.SA'). The description only implies it is a stock ticker, adding little beyond the schema's field name.

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 provides a descriptive summary of a B3 stock with six specific numbers and three questions, including metrics like net margin, ROIC, debt/EBITDA, P/L, P/VP, and a confidence flag. It is specific about the resource and output structure, though it does not explicitly name a sibling alternative to differentiate from.

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 implies usage when a descriptive, non-opinionated summary is needed, and notes it is free and requires no key. However, it does not explicitly state when to use this tool versus siblings like 'multiplos' or 'scores', nor does it provide exclusions or conditions.

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