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 the tool retrieves statistics (implying read-only) and describes the return content, but doesn't address important behavioral aspects like authentication requirements, rate limits, error conditions, or whether this is a real-time or aggregated data source. The description adds some value but leaves significant gaps for a tool with zero 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, parameter guidance, and return information in just three sentences. Each sentence adds value: the first states what the tool does, the second explains parameter flexibility, and the third describes the return content. No wasted words or redundancy.

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 single-parameter read tool with no annotations and no output schema, the description provides basic purpose, parameter semantics, and return content. However, it lacks important contextual details like authentication requirements, rate limits, time range parameters (if statistics are time-bound), or whether this provides real-time vs historical data. The description is minimally adequate but has clear 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?

With 0% schema description coverage for the single parameter, the description provides crucial semantic information by explaining that 'zone_identifier' accepts 'origin domain, CDN domain, or UUID' and mentioning 'Smart identifier resolution.' This adds meaningful context beyond the bare schema type, though it doesn't specify format constraints or provide examples.

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 with a specific verb ('Get statistics') and resource ('for a CDN zone'), making it immediately understandable. However, it doesn't explicitly differentiate from sibling tools like 'get_cdn_zone' or 'get_cdn_zone_summary', which appear to provide different types of CDN zone information.

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 some usage context by mentioning 'Smart identifier resolution' and listing acceptable identifier types (origin domain, CDN domain, or UUID), which helps guide parameter usage. However, it doesn't specify when to use this tool versus alternatives like 'get_cdn_zone' or 'get_cdn_zone_summary' from the sibling list, nor does it mention any prerequisites or exclusions.

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