Vultr MCP

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

No annotations are provided, so the description carries full burden. While it mentions the return type ('List of firewall rules'), it doesn't disclose important behavioral aspects like whether this is a read-only operation, if it requires specific permissions, how results are formatted, pagination behavior, or error conditions. The description is minimal beyond basic functionality.

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 followed by Args and Returns sections. It's appropriately sized for a simple listing tool, though the formatting could be more polished (e.g., consistent capitalization in section headers).

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 simple read operation with 1 parameter and no output schema, the description provides basic but incomplete coverage. It explains what the tool does and the parameter, but lacks behavioral context (permissions, pagination, error handling) that would be helpful for an agent. Given the absence of annotations and output schema, more completeness would be beneficial.

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 single parameter ('load_balancer_id') with examples of acceptable values (labels or UUIDs). This adds meaningful context beyond the bare schema. However, it doesn't fully document all semantic aspects like format constraints or validation rules.

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 verb ('List') and resource ('firewall rules for a load balancer'), making the purpose specific and understandable. However, it doesn't explicitly distinguish this tool from potential siblings like 'get_firewall_rule' (singular) or other list operations, which would be needed for 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. With many sibling tools present (including 'get_firewall_rule' and other list operations), there's no indication of when this specific listing tool is appropriate versus other querying or retrieval methods.

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