Vultr MCP

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

With no annotations, the description carries full burden. It states 'Create a new IPv4 address' implying a mutation, but lacks critical behavioral details: whether this requires admin permissions, if it's idempotent, potential side effects (e.g., network downtime), rate limits, or error conditions. The mention of reboot defaulting to True hints at impact but doesn't elaborate on consequences.

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 with the core purpose, followed by parameter and return sections. It's appropriately sized with no redundant sentences, though the 'Returns' line is somewhat generic and could be more specific if not for the output schema.

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, but an output schema exists, the description is moderately complete. It covers the action and parameters well, but lacks behavioral context (permissions, side effects) and doesn't leverage the output schema to clarify return values. For a 2-parameter creation tool, it's adequate but has clear gaps in safety and operational guidance.

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 provides clear semantics for both parameters: 'instance_id' as an ID, label, or hostname with examples, and 'reboot' with its default and purpose. This adds significant value beyond the bare schema, though it doesn't cover edge cases (e.g., invalid instance formats).

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 'Create' and the resource 'IPv4 address for an instance', making the purpose specific and understandable. It distinguishes from obvious siblings like 'delete_ipv4' by focusing on creation, though it doesn't explicitly differentiate from other creation tools (e.g., 'create', 'create_record') beyond the IPv4 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?

No guidance is provided on when to use this tool versus alternatives. The description doesn't mention prerequisites (e.g., instance must exist, networking permissions), exclusions, or comparisons to sibling tools like 'attach_to_instance' or 'convert_instance_ip', leaving the agent to infer usage context.

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