Vultr MCP

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

With no annotations provided, the description carries full burden but only states it stops a migration and returns a status message. It lacks critical behavioral details: whether this is destructive (interrupts migration), requires specific permissions, has side effects (e.g., leaves database in partial state), or handles errors. For a mutation 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 efficiently structured with a clear purpose statement followed by Args and Returns sections. It's front-loaded and wastes no words, though the Returns section could be more informative (e.g., describing possible status messages).

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 mutation tool with no annotations, no output schema, and low schema coverage, the description is incomplete. It misses critical context: behavioral risks (e.g., irreversible stop), error handling, prerequisites (migration must be active), and what the status message contains. The agent lacks enough information to use this tool safely and effectively.

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 basic meaning for the single parameter ('database_id: The database ID or label'). This clarifies what the parameter represents, though it doesn't provide format examples or constraints. With one parameter and some added semantics, it meets the baseline for minimal viability.

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 ('stop') and resource ('ongoing database migration'), making the purpose specific and understandable. However, it doesn't explicitly differentiate from sibling tools like 'start_migration' or 'get_migration_status', 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. It doesn't mention prerequisites (e.g., only works on active migrations), exclusions, or refer to sibling tools like 'start_migration' or 'get_migration_status' for context.

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