Vultr MCP

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. While 'Get details' implies a read-only operation, it doesn't specify whether this requires authentication, has rate limits, or what happens on errors (e.g., invalid domain). The description mentions return values, but since an output schema exists, this adds minimal value. For a tool with zero annotation coverage, more behavioral context is needed.

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 appropriately concise and well-structured. It front-loads the purpose in the first sentence, followed by clear 'Args' and 'Returns' sections. There's no wasted text, and the information is organized for quick scanning. It could be slightly more efficient by integrating the parameter explanation into the main sentence, but overall it's very good.

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?

Given the tool's low complexity (1 parameter) and the presence of an output schema, the description is somewhat complete but has gaps. It covers the basic purpose and parameter, but lacks usage guidelines and sufficient behavioral transparency (e.g., error handling, authentication). With no annotations and simple schema, the description should do more to compensate, making it adequate but not fully comprehensive.

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 description adds minimal parameter semantics beyond the input schema. It states 'domain: The domain name to get details for,' which clarifies the parameter's purpose but doesn't provide format examples (e.g., 'example.com'), validation rules, or constraints. With 0% schema description coverage, this partially compensates but doesn't fully address the gap. The baseline is 3 since the description at least names and briefly explains the single parameter.

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 tool's purpose: 'Get details for a specific DNS domain.' It uses a specific verb ('Get') and resource ('DNS domain'), making the action clear. However, it doesn't explicitly differentiate from sibling tools like 'analyze_domain' or 'list_domains', which prevents a perfect score.

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?

The description provides no guidance on when to use this tool versus alternatives. With sibling tools like 'analyze_domain' and 'list_domains' available, there's no indication of when this specific 'get' operation is appropriate versus analysis or listing operations. The description lacks any context about prerequisites or exclusions.

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