Vultr MCP

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

With no annotations provided, the description carries full burden for behavioral disclosure. While it correctly identifies this as a creation operation, it doesn't mention authentication requirements, rate limits, error conditions, whether the operation is idempotent, or what happens if a duplicate record is attempted. For a mutation tool with zero annotation coverage, this represents significant gaps.

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 clear sections for the main purpose, arguments, and returns. While efficient, the 'Args:' and 'Returns:' headings could be more concise, and the parameter explanations could be slightly more compact while maintaining 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?

Given the tool's complexity (6 parameters, mutation operation) and absence of annotations, the description does well by documenting all parameters and mentioning the return value. However, it lacks behavioral context about permissions, side effects, and error handling. The presence of an output schema helps, but more operational guidance 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?

With 0% schema description coverage for 6 parameters, the description fully compensates by providing clear documentation for all parameters. It explains each parameter's purpose, provides examples for record_type, clarifies priority's specific use cases, and documents the default value for ttl. This adds substantial value beyond the bare schema.

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 specific action ('Create a new DNS record') and resource ('DNS record'), distinguishing it from sibling tools like 'create_domain' or 'update_record'. It uses precise technical terminology that leaves no ambiguity about what the tool does.

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. While sibling tools include 'create_domain', 'delete_record', 'update_record', and 'list_records', there's no mention of prerequisites, dependencies, or appropriate contexts for DNS record creation versus other DNS operations.

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