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

Annotations already declare readOnlyHint=true, so the agent knows this is a safe read operation. The description adds only the freshness detail 'precios actuales' and does not contradict the annotations, but it provides no further behavioral context such as response format or update semantics.

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 short sentence with no filler, and the key scope ('servicios de 2ds') and price freshness are front-loaded. It is appropriately sized for a simple no-argument catalog tool.

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 no-argument, read-only catalog tool, the description plus annotations are sufficient for correct invocation. The only minor gap is that '2ds' is not expanded, but the title and sibling context make the purpose clear enough.

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 tool has zero parameters, so there is no parameter documentation burden for the description. The schema fully covers the empty parameter set, and the description does not need to compensate for missing parameter details.

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 names the resource ('Servicios de 2ds') and the data ('precios actuales'), so an agent can infer this is a catalog/list tool. It lacks an explicit action verb like 'list' or 'show', but the meaning is clear enough and distinguishable from the sibling tools by topic.

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 gives no guidance about when to use this tool instead of siblings such as 'comprobar_visibilidad_ia', 'preguntas_frecuentes', or 'solicitar_diagnostico'. Any usage intent must be inferred from the title and description alone.

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