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 of behavioral disclosure. It mentions the action ('export') and output ('DNS zone file content as string'), but fails to describe critical behaviors: whether this requires specific permissions, if it's a read-only operation, what happens if the domain doesn't exist, or any rate limits. The description is minimal and lacks necessary operational context.

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 concise, with a clear purpose statement followed by 'Args' and 'Returns' sections. Every sentence earns its place by defining the tool's function and parameters. However, it could be slightly more front-loaded by integrating the parameter info into the main description, but overall it's efficient with zero waste.

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 low complexity (one parameter) and the presence of an output schema (implied by 'Returns' in description), the description is moderately complete. It covers the basic action and parameter but lacks depth in behavioral aspects like error handling or permissions. Without annotations and with minimal param details, it's adequate but has clear gaps for a read/export operation.

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 schema description coverage is 0%, but the description compensates by documenting the single parameter 'domain' with a brief explanation ('The domain name to export'). This adds meaning beyond the bare schema, which only specifies a string type. However, it doesn't provide details like format constraints (e.g., valid TLDs) or examples, leaving some gaps. With one parameter and partial coverage, a baseline 3 is appropriate.

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: 'Export domain records as standard DNS zone file format.' It specifies the verb ('export'), resource ('domain records'), and output format ('DNS zone file'), making the action unambiguous. However, it does not explicitly differentiate from sibling tools like 'import_zone_file' or 'list_domains', which is why it doesn't score a 5.

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, such as whether the domain must exist or be managed, nor does it compare with siblings like 'get_domain' or 'list_records'. The only implied usage is for exporting DNS data, but no explicit context or exclusions are provided.

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