Vultr MCP

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

No annotations are provided, so the description must fully disclose behavioral traits. It only states that it returns a list of plans with pricing and specifications, but doesn't cover critical aspects like whether it requires authentication, rate limits, pagination behavior, or error conditions. For a tool with zero annotation coverage, this is a significant gap in transparency.

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 extremely concise and front-loaded: the first sentence states the core purpose, and the second clarifies the return value. There's no wasted language or redundancy, making it efficient and easy for an agent to parse quickly.

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 the tool has 0 parameters, an output schema exists (which covers return values), and no annotations, the description is minimally adequate. It states what the tool does and what it returns, but lacks behavioral context (e.g., authentication needs, rate limits) that would be helpful for a read operation. The output schema likely details the return structure, so the description doesn't need to elaborate further on that aspect.

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 input schema has 0 parameters with 100% description coverage, so the schema fully documents the absence of inputs. The description doesn't need to add parameter semantics, and it appropriately doesn't mention any parameters. This meets the baseline expectation for a parameterless tool.

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: 'List all available managed database plans' specifies the verb ('List') and resource ('managed database plans'). It distinguishes from siblings like 'compare_plans' or 'get_plan' by focusing on listing all plans rather than comparing or retrieving a specific one. However, it doesn't explicitly differentiate from 'list_vc2_plans' or similar plan-listing tools, which slightly reduces specificity.

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 when to choose 'list_plans' over 'compare_plans', 'search_plans_by_specs', or other plan-related tools in the sibling list. There's no context about prerequisites, such as authentication or account requirements, leaving the agent without usage direction.

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