nordvpn_servers

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

With no annotations, the description fails to disclose behavioral traits like read-only nature, prerequisite VPN connection, or output format. It only states the function without depth.

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, straightforward sentence with no unnecessary words. However, it could benefit from additional structure (e.g., listing use cases or notes) for clarity.

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?

The tool has no parameters, output schema, or annotations, so the description is the sole source of information. It is incomplete: it mentions filtering but doesn't explain how to invoke it, nor does it describe the output. The tool's simplicity does not fully excuse the gaps.

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?

Although there are zero parameters (baseline 4), the description mentions 'by country or specialty' which implies filtering, but the input schema is empty. This creates confusion about how to specify filters, reducing the value added.

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 clearly states the verb 'Get' and resource 'recommended NordVPN servers', with filters by country or specialty. It is distinguishable from sibling tools like 'nordvpn_status' and 'nordvpn_diagnose' which serve different purposes.

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?

No guidance is provided on when to use this tool versus alternatives, such as when to fetch non-recommended servers or use diagnostic tools. The description lacks context for decision-making.

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