compare_countries

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, and it adds nothing: no statement that this is a read-only lookup, no auth or rate-limit notes, and no indication of whether the result is a side-by-side diff or a merged view.

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 sentence with zero filler, and the core action and scope are front-loaded immediately.

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 simple two-parameter read tool with full schema coverage this is minimally viable, but with no annotations and no output schema the description leaves unanswered what the comparison actually returns and in what shape.

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 description coverage is 100% and both parameters are documented as 2-character country codes, so the baseline is 3. The description adds no format guidance (e.g. ISO 3166 alpha-2) or ordering semantics beyond what the schema already states.

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 (compare) plus the resources (e-invoicing requirements and VAT rates) and scope (two countries). It implicitly contrasts with the sibling getters, which operate on one country, but never names or explicitly differentiates from them.

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 by the verb 'compare' and the two required country parameters; the description never says when to reach for this over get_vat_rates or get_einvoicing_requirements, nor notes any prerequisites or exclusions.

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