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

No annotations are provided, so the description carries the full behavioral burden. It usefully discloses that this is a paid, pay-per-use operation with a specific cost and network ('x402: 0.05 USDC on Base'), which is valuable context. However, it omits core behavioral traits such as output format, whether the operation has side effects, auth requirements, rate limits, or what happens on failure.

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 compact and front-loaded: the core purpose appears first, followed by a brief input hint and the payment note. Every element is useful, though the extreme brevity leaves important details unstated rather than being a model of efficient completeness.

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 report-generation tool with no output schema and a single vaguely typed input parameter, the description is too thin. It does not explain the expected input format for 'movimientos' (e.g., JSON, CSV, structured list), what the generated report draft contains, or any output or delivery details. The payment note is helpful but does not fill the core specification 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?

Schema coverage is 100%, but the schema parameter description is merely 'service input', which is uninformative. The description compensates by stating 'input=movimientos', clarifying that the single string parameter should contain movements. This adds concrete meaning beyond the schema's generic label.

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 verb and resource: 'Borrador de reporte fiscal a partir de movimientos'. An agent can tell it generates a fiscal report draft from movements. However, it does not differentiate from similar siblings such as parser-bloque-contable or valor-consolidado, leaving some ambiguity about when this tool is preferred.

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 when-to-use guidance, no conditions for selecting this tool over alternatives, and no exclusions. The phrase 'a partir de movimientos' implies a context but does not tell the agent when this tool is appropriate versus other fiscal or report-generation siblings.

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