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

With no annotations provided, the description must carry the full behavioral burden. It does disclose the pay-per-use nature with a specific price (0.05 USDC on Base) and hints at the input convention. However, it does not describe the output format, any side effects beyond the charge, or how the destination language is specified inside the input string. The payment note adds value, but the behavioral picture is incomplete for an agent to fully predict the tool's 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 appropriately terse: purpose, input noted, and cost pressed into three short clauses. The main action is front-loaded, and each element is sized. The 'x402' reference is cryptic and not expanded upon, which could harm clarity, but overall it is compact and well structured.

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 tool with one parameter, no annotations, and no output schema, the description leaves essential operational details ambiguous: the method for specifying the destination language is not clearly defined, and the return value (the translated document) is not stated. Combined with the pay-per-use requirement, an agent evaluating input formation and result handling would still have to guess at a critical part of the contract. Simplicity does not offset this gap.

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 only says 'service input', which is generic and uninformative. The description adds real meaning: the 'input' parameter should contain the document text, and the target language should be included as well (e.g., '(+ idioma destino)'). This is a meaningful semantic supplement beyond the schema's placeholder description, making the parameter's contract far clearer than the schema alone.

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 the action (translate), the resource (a complete document), and the expected input content (document text plus optionally a destination language). It is concise and distinguishable from siblings like 'traducir-texto' by the phrase 'documento completo', though it does not explicitly name an alternative. Not 5 because it does not directly contrast with other translation siblings, but the resource and scope are clear.

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 phrase 'documento completo' implies usage for entire documents, and the 'input=texto del documento (+ idioma destino)' gives a usage hint for how to structure the input. However, there is no explicit guidance on when to choose this tool over similar siblings (e.g., 'traducir', 'traducir-texto', 'translate-doc'), nor are there any exclusion conditions. The usage context is implied but not elaborated.

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