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 return format ('Dictionary of available permissions with descriptions and risk levels'), which is helpful. However, it doesn't cover critical aspects like whether this is a read-only operation, if it requires specific permissions, rate limits, or error conditions. For a tool with zero annotation coverage, this is a significant gap.

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 concise and well-structured with two sentences: one stating the purpose and another describing the return format. It's front-loaded with the main action and avoids unnecessary details. However, it could be slightly more efficient by combining the sentences, but it's still highly effective.

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 has 0 parameters, no annotations, and no output schema, the description does an adequate job by explaining the purpose and return format. However, it lacks details on behavioral aspects like permissions needed or operational constraints. For a simple list tool, this is minimally viable but leaves room for improvement in completeness.

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 tool has 0 parameters, and schema description coverage is 100%, so there are no parameters to document. The description doesn't need to add parameter semantics, and it appropriately focuses on the tool's purpose and output. A baseline of 4 is applied since no parameters exist, and the description doesn't attempt to explain non-existent parameters.

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 permissions that can be granted to users.' It specifies the verb ('List') and resource ('available permissions'), making it easy to understand what the tool does. However, it doesn't explicitly differentiate from sibling tools like 'analyze_user_permissions' or 'setup_permissions', 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 no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites, timing, or how it differs from related tools such as 'analyze_user_permissions' or 'setup_permissions'. This lack of context leaves the agent without clear usage instructions.

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