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

Annotations already declare readOnlyHint=true and idempotentHint=true, but the description adds little useful behavioral context. The term 'signed decision' is ambiguous (could imply producing a signed document), and 'Paid (x402)' is cryptic and potentially confusing, adding no clarity about side effects or expected behavior.

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 very short and front-loaded, but the opening 'Paid (x402)' is cryptic and not immediately informative. It is concise but sacrifices clarity, making it only minimally acceptable.

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?

Given the tool has nested objects, no output schema, and an ambiguous action, the description is severely incomplete. It fails to explain what the decision output looks like, the meaning of 'signed,' or how the objective parameter influences the decision, leaving the agent under-informed.

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 0%, so the description must compensate for parameter meaning, but it does not. It mentions 'objective-based' but never explains the 'objective' parameter or the 'subject' object structure. The only parameter hint, 'cnpj' in the schema, comes from the schema itself, not the description.

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 says 'objective-based signed decision for a Brazilian company,' which vaguely indicates a decision-making action but lacks a clear verb or specific outcome. It does not distinguish this tool from sibling tools such as 'approve_supplier' or 'verify_company_status' beyond the geographic focus, which is insufficient.

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 guidance on when to use this tool versus alternatives. The only hint is the phrase 'Brazilian company,' which implies a geographic scoping relative to the UK-focused siblings, but no direct comparison or exclusion criteria are provided.

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