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. It states 'Create a new ISO image' implying a mutation, but lacks details on permissions, rate limits, side effects, or what 'Created ISO details' entails. This is inadequate for a mutation tool with zero annotation coverage.

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 front-loaded with the main purpose, followed by brief Arg/Return sections. It's efficient with no wasted sentences, though the structure could be more integrated (e.g., merging the Arg/Return into the main text) for optimal flow.

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, 0% schema coverage, and an output schema (which helps), the description is moderately complete. It covers the basic action and parameter but lacks behavioral context and usage guidelines, making it adequate but with clear gaps for safe tool invocation.

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%, but the description adds minimal value by specifying that 'url' is 'The URL to create the ISO from'. This clarifies the parameter's purpose beyond the schema, though it doesn't detail format constraints or examples. With one parameter, the baseline is 4, but the limited compensation for schema gaps reduces it to 3.

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 action ('Create a new ISO image') and resource ('from URL'), making the purpose specific and understandable. However, it doesn't differentiate from sibling tools like 'create_from_url' or 'create' which might have overlapping functionality, preventing 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 (e.g., 'create_from_url', 'create'), there's no indication of prerequisites, context, or exclusions, leaving usage ambiguous.

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