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. It mentions 'Smart identifier resolution' which adds some behavioral context, but fails to disclose critical traits such as whether this is a read-only operation, if it requires specific permissions, rate limits, or error handling. For a tool with no annotations, this leaves significant gaps in understanding its behavior.

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 appropriately sized and front-loaded: the first sentence states the core purpose, followed by a brief behavioral note and structured Args/Returns sections. Every sentence adds value without redundancy, making it efficient and easy to parse.

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 moderate complexity (single parameter, no output schema, no annotations), the description is adequate but has gaps. It explains the parameter well and hints at behavior, but lacks details on output format (e.g., what 'SSL certificate information' includes beyond expiry and status), error cases, or authentication requirements. This makes it minimally viable but not fully comprehensive.

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 explaining the parameter 'zone_identifier' in the Args section: 'The CDN zone origin domain, CDN domain, or ID.' This adds meaningful semantics beyond the bare schema, clarifying acceptable input formats. With only one parameter, this is sufficient to earn a high score despite the low schema coverage.

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: 'Get SSL certificate information for a CDN zone.' It specifies the verb ('Get'), resource ('SSL certificate information'), and scope ('for a CDN zone'). However, it does not explicitly differentiate from sibling tools like 'get_cdn_zone' or 'get_cdn_zone_summary', which focus on different aspects of CDN zones.

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 implied usage guidance by mentioning 'Smart identifier resolution: use origin domain, CDN domain, or UUID,' which suggests when to use this tool (when you need certificate details) and hints at parameter flexibility. However, it lacks explicit guidance on when to choose this tool over alternatives like 'get_cdn_zone' or 'analyze_domain,' and does not state 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.