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. It clearly indicates a creation/write operation ('Set up a new user') and specifies the return value ('Created user information with applied permissions'), but does not disclose behavioral traits like required permissions, rate limits, error conditions, or whether the operation is idempotent.

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 with clear sections (purpose, Args, Returns) and uses bullet points for permission level details. It's appropriately sized but could be more front-loaded by moving the permission mappings to a separate section or note to improve initial scanability.

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 complexity of a user creation tool with permission configuration, no annotations, and no output schema, the description does well by explaining parameters thoroughly and specifying the return value. However, it lacks information about authentication requirements, error handling, and what specific user information is returned.

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, the description fully compensates by providing detailed semantics for all 5 parameters. It explains each parameter's purpose and, crucially, documents the 'permissions_level' enum values with comprehensive mappings to specific permission sets, adding significant value beyond the bare schema.

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 ('Set up') and resource ('new user with standard permission sets'), distinguishing it from sibling tools like 'create_user' or 'setup_service_user' by emphasizing permission configuration. It explicitly defines what constitutes 'standard' through detailed permission level mappings.

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 implies usage for creating users with predefined permission sets, but does not explicitly state when to use this tool versus alternatives like 'create_user' or 'setup_service_user'. It provides context through permission level details but lacks explicit comparison or exclusion criteria.

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