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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds domain constraints the annotations cannot convey — currency (EUR), VAT exclusion, business-only audience, and the enumerated returned content — which meaningfully reduces invocation ambiguity despite no output 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?

A single front-loaded sentence opening with verb and resource, with no filler. It is a dense enumerated list, but each listed item (packages, module prices, conditions, usage costs) carries distinct information, so nothing is padding.

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 parameters and no output schema, the description must carry the return-value burden, and it does describe what comes back plus key business qualifiers (EUR, ex-VAT, businesses only). Minor gaps remain around freshness or caching of pricing data, but nothing essential for calling a zero-arg read tool is missing.

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 per the rubric the baseline is 4. The schema is trivially complete, and the description appropriately adds no parameter discussion, instead clarifying that location and month are dimensions of the returned data rather than inputs.

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 specific verb ('Returns') and resource ('oqda pricing') and enumerates the exact contents: packages, module prices, conditions, usage-based costs. That is far more specific than a sibling like get_page, though it never names an alternative to distinguish it from list_modules or compare_alternatives.

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?

Usage is only implied — an agent can infer this answers pricing questions — and the description supplies useful scope qualifiers (per location and month, EUR, excluding VAT, businesses only). However, it gives no explicit when-to-use rule and never points to compare_alternatives or list_modules as the tool to pick for adjacent questions.

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