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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real value beyond that: it discloses that the response includes dynamic 'today's remaining capacity' and x402 payment fields (network, asset, payTo), which signals freshness and a payment prerequisite not visible in the schema.

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 verb and resource are front-loaded, the enumeration is dense with distinct field groups, and the closing imperative adds ordering without redundancy. No sentence is filler.

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?

With no output schema, the description carries the burden of describing returns, and it does so by enumerating prices, turnaround, coverage, capacity, payment details and limits. 'Hard limits' remains undefined and refresh/caching semantics for today's capacity are unstated, leaving a small 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 tool takes zero parameters, so the baseline of 4 applies; there is no parameter semantics to explain. The description correctly spends its budget on return content instead of inventing input detail.

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?

States a concrete verb and resource ('Returns the catalog of human verification services in Peru') and enumerates exactly what the catalog contains, so an agent knows precisely what it gets. The 'Call this first' cue positions it relative to the sibling workflow tools (cotizar, pagar_solicitud, solicitar_verificacion) as the entry point.

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?

'Call this first' gives explicit sequencing guidance for the multi-step flow, which is more than most list tools offer. It stops short of naming when-not-to-use conditions or the specific sibling to use afterward, so it lacks full routing detail.

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