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. It states the tool creates DNS records, implying a write/mutation operation, but doesn't disclose critical behavioral traits: required permissions, whether changes are reversible, rate limits, or error conditions. The description adds minimal context beyond the basic action, leaving significant gaps for a mutation tool.

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 well-structured and front-loaded: the first sentence states the purpose, followed by organized sections for Args and Returns. Every sentence adds value—no fluff or repetition. It's appropriately sized for a tool with three parameters and a clear output.

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 no annotations and an output schema (implied by 'Returns'), the description is moderately complete. It covers purpose and parameters but lacks behavioral context (e.g., side effects, auth needs). The output schema handles return values, so the description doesn't need to explain them. However, for a mutation tool, more disclosure on risks or prerequisites would improve completeness.

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 includes an 'Args' section that explains all three parameters: 'domain' (domain name), 'ip' (website IP address), and 'www_enabled' (whether to create www subdomain record with default). Since schema description coverage is 0%, this compensates fully by providing clear semantics for each parameter, though it lacks format details (e.g., IP format).

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: 'Set up basic DNS records for a website.' It specifies the verb ('Set up'), resource ('basic DNS records'), and context ('for a website'), making the intent unambiguous. However, it doesn't explicitly differentiate from sibling tools like 'create_domain' or 'create_record', which might handle similar DNS-related operations.

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. It doesn't mention prerequisites (e.g., domain ownership), exclusions, or compare it to siblings like 'create_domain' or 'setup_cdn_for_website'. The agent must infer usage from the purpose alone, which is insufficient for optimal tool selection.

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