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. While 'Update an existing DNS record' implies a mutation operation, it doesn't disclose important behavioral aspects like required permissions, whether the update is reversible, rate limits, error conditions, or what happens when optional parameters are omitted. The description adds minimal behavioral context beyond the basic operation.

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 organized 'Args' and 'Returns' sections. Every sentence earns its place, and the information is front-loaded with the core purpose stated first. The formatting enhances readability without unnecessary verbosity.

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 that this is a mutation tool with no annotations, 6 parameters, and an output schema exists, the description provides adequate but incomplete context. The parameter explanations are good, and the output schema will handle return values, but the description lacks important behavioral context about permissions, side effects, and error handling that would be crucial for safe tool invocation.

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, the description compensates well by providing clear explanations for all 6 parameters in the 'Args' section. Each parameter gets a brief but meaningful description that adds semantic value beyond the bare schema, explaining what 'domain', 'record_id', 'name', 'data', 'ttl', and 'priority' represent in the context of DNS records.

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 ('Update') and resource ('existing DNS record'), making the purpose immediately understandable. However, it doesn't explicitly differentiate this tool from sibling tools like 'create_record' or 'delete_record' beyond the obvious update vs create/delete distinction.

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 (like needing an existing record), when not to use it, or how it differs from similar tools like 'create_record' or 'delete_record' beyond the basic operation type.

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