Vultr MCP

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

With no annotations provided, the description carries full burden but only states it 'Creates a new DNS domain' and returns 'Created domain information'. It lacks details on permissions required, rate limits, whether the operation is idempotent, what happens on conflicts, or other behavioral traits like error handling or side effects.

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 sized and front-loaded with the core purpose in the first sentence, followed by structured 'Args' and 'Returns' sections. It avoids unnecessary fluff, though the formatting with bullet-like sections is slightly verbose but still efficient.

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 has an output schema (which covers return values), no annotations, and 3 parameters with 0% schema coverage, the description is moderately complete. It explains parameters well but lacks behavioral context and usage guidelines, making it adequate but with clear gaps for a creation tool.

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 significant value beyond the input schema, which has 0% description coverage. It explains the meaning of all three parameters ('domain', 'ip', 'dns_sec'), including the default for 'dns_sec' and its allowed values ('enabled/disabled'), compensating well for the schema's lack of documentation.

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 'Create' and resource 'DNS domain', making the purpose specific and understandable. However, it doesn't explicitly differentiate from sibling tools like 'create_cdn_zone' or 'create_record', which also create DNS-related resources, so it doesn't fully distinguish from 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?

The description provides no guidance on when to use this tool versus alternatives like 'create_cdn_zone' or 'create_record', nor does it mention prerequisites, exclusions, or context for usage. It only states what the tool does, not when to invoke it.

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