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' without disclosing behavioral traits. It doesn't mention whether this is an idempotent operation, what permissions are required, whether it incurs costs, what happens on failure, or any rate limits. The description is minimal beyond the basic action.

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 with a clear purpose statement followed by organized parameter explanations and return value indication. It's appropriately sized for an 8-parameter tool, though the 'Args:' and 'Returns:' sections could be more integrated with the main description.

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 creation tool with 8 parameters and no annotations or output schema, the description provides good parameter coverage but lacks important context about the operation's behavior, side effects, and typical usage patterns. The return value is mentioned but not described, which is problematic without an output schema.

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?

With 0% schema description coverage for 8 parameters, the description provides excellent parameter semantics by listing all parameters with brief explanations of what each controls. This fully compensates for the lack of schema documentation and gives meaningful context for each input field.

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 action ('Create') and resource ('a new CDN zone'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'create_domain' or 'setup_cdn_for_website' beyond the obvious naming difference.

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 about when to use this tool versus alternatives like 'setup_cdn_for_website' or 'update_cdn_zone'. The description lacks context about prerequisites, dependencies, or typical use cases for CDN zone creation.

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