Vultr MCP

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states it's a read operation ('Get details'), implying it's non-destructive, but doesn't cover critical aspects like authentication requirements, rate limits, error conditions, or response format details. For a tool with zero annotation coverage, this is insufficient.

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 appropriately sized. It front-loads the purpose in the first sentence, followed by clear sections for Args and Returns. There's no wasted text, though the Returns section is minimal and could be more informative.

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 complexity (2 required parameters, no annotations, no output schema), the description is incomplete. It lacks behavioral context (e.g., permissions, errors), detailed parameter guidance, and output specifics. For a tool that retrieves security-related resources, more context is needed to ensure safe and effective use.

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?

Schema description coverage is 0%, so the schema provides no parameter documentation. The description adds basic semantics by naming the parameters ('load_balancer_id', 'firewall_rule_id') and giving examples for load_balancer_id (e.g., 'web-lb', UUID). However, it doesn't explain what a firewall_rule_id is, format requirements, or where to find these IDs, leaving gaps in usability.

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 details of a specific firewall rule.' It uses a specific verb ('Get') and resource ('firewall rule'), making the action explicit. However, it doesn't distinguish from sibling tools like 'list_firewall_rules' or 'get_rule', which could be ambiguous without context.

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 (e.g., needing a load balancer ID), differentiate from similar tools (e.g., 'list_firewall_rules' for multiple rules), or specify use cases. This leaves the agent without context for tool selection.

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