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 this is an update operation (implying mutation) and mentions a return value, but lacks critical details: required permissions, whether changes are reversible, error conditions, or side effects. For a mutation tool with zero annotation coverage, this is a significant gap in transparency.

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 front-loaded: the first sentence states the core purpose, followed by clear 'Args' and 'Returns' sections. Every sentence earns its place by providing essential information without redundancy. The formatting with bullet-like sections enhances 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?

Given a mutation tool with no annotations, 2 parameters, and an output schema (which handles return values), the description is moderately complete. It covers the basic operation and parameters but lacks behavioral context (permissions, reversibility) and doesn't reference the output schema. For a simple update tool, this is adequate but leaves gaps an agent might need to infer.

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 description must compensate. It effectively documents both parameters: 'firewall_group_id' (with examples of ID formats) and 'description' (as the new description). This adds clear meaning beyond the bare schema, though it doesn't cover constraints like length limits or character sets for the description.

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 ('Update') and resource ('firewall group description'). It distinguishes from siblings like 'create_group' and 'delete_group' by focusing on modification rather than creation or deletion. However, it doesn't explicitly differentiate from other update tools like 'update_record' or 'update_user' beyond the resource type.

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 an existing firewall group), compare with similar tools like 'update' (which might be more general), or specify use cases. The agent must infer usage from the tool name and parameters alone.

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