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. It states this is a read operation ('Get information'), which implies it's non-destructive, but doesn't disclose any behavioral traits like authentication requirements, rate limits, error conditions, or what happens if the rule doesn't exist. The description is minimal and lacks important operational context.

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. Every sentence serves a purpose, though the 'Returns' section is somewhat redundant given the existence of an output schema. The formatting helps readability.

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 read operation with 2 parameters and an output schema, the description provides basic purpose and parameter context but lacks important operational guidance. With no annotations and minimal behavioral disclosure, it's adequate but leaves gaps in understanding authentication, error handling, and differentiation from similar tools.

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?

With 0% schema description coverage for both parameters, the description adds some value by explaining that 'firewall_group_id' can be either an ID or description (e.g., 'web-servers' or UUID) and that 'firewall_rule_id' is the rule ID. However, it doesn't fully compensate for the schema gap - it doesn't explain format constraints, validation rules, or provide examples beyond the brief mention.

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 with a specific verb ('Get information') and resource ('about a specific firewall rule'), making it immediately understandable. However, it doesn't differentiate from sibling tools like 'list_firewall_rules' or 'get_firewall_rule' (which appears to be a duplicate), leaving some ambiguity about when to use this exact tool.

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 sibling tools like 'list_firewall_rules' available, there's no indication whether this is for retrieving a single rule by ID versus listing multiple rules, nor any prerequisites or context for usage.

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