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 describes a read operation ('Get') but doesn't disclose behavioral traits such as whether it requires authentication, rate limits, error handling, or pagination. The description is too basic for a tool that likely interacts with a cloud service API.

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. It starts with a clear purpose statement, followed by 'Args:' and 'Returns:' sections that efficiently document parameters and output. Every sentence earns its place, with no wasted words.

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 (1 parameter, no annotations, but with an output schema), the description is adequate but has gaps. It explains the parameter well and notes the return type, but lacks behavioral context (e.g., auth, errors). The output schema likely covers return values, so the description doesn't need to detail them, but overall it's minimally viable.

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 description adds significant value beyond the input schema. The schema has 0% description coverage and only defines 'region' as a string. The description provides semantics: 'Region code (e.g., 'ewr', 'lax')', clarifying the format and giving examples. This compensates well for the schema's lack of detail.

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 plans available in a specific region.' It specifies the verb ('Get') and resource ('plans'), and includes the scope ('in a specific region'). However, it doesn't explicitly differentiate from sibling tools like 'find_regions_with_plan' or 'compare_plans', which prevents a perfect score.

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 minimal guidance: it states the tool is for getting plans by region. It doesn't explain when to use this tool versus alternatives like 'list_plans', 'find_regions_with_plan', or 'compare_plans', nor does it mention any prerequisites or exclusions. This lack of comparative context limits its usefulness.

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