Vultr MCP

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions that it 'Returns DNS record details', which implies a read-only operation, but doesn't specify permissions required, error conditions, or response format beyond the output schema. This leaves significant gaps for a tool with no annotation coverage.

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 efficiently structured with a clear purpose statement followed by Args and Returns sections. It avoids unnecessary words, though the 'Args' and 'Returns' labels are somewhat redundant given the structured schema, but they enhance readability without excessive length.

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 2 parameters with 0% schema coverage and an output schema present, the description adds basic parameter semantics but lacks behavioral details like permissions or error handling. It's minimally adequate for a simple read tool, but with no annotations, it should do more to compensate for the schema gaps.

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?

Schema description coverage is 0%, so the description must compensate. It lists both parameters ('domain' and 'record_id') with brief explanations, adding meaning beyond the bare schema. However, it doesn't detail format constraints (e.g., domain syntax, record_id format) or examples, providing only basic semantic context.

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 'Get' and resource 'details for a specific DNS record', making the purpose unambiguous. However, it doesn't differentiate from sibling tools like 'list_records' or 'get_domain', which might retrieve related information, so it doesn't reach the highest 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?

No guidance is provided on when to use this tool versus alternatives such as 'list_records' for multiple records or 'get_domain' for domain-level details. The description only states what it does, not when it's appropriate, leaving usage context unclear.

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