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 mentions the destructive action ('Delete') but doesn't specify whether this requires special permissions, if the deletion is reversible, what happens to network connectivity during/after deletion, or any rate limits. 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 well-structured with a clear purpose statement followed by Args and Returns sections. It's front-loaded with the core action and avoids unnecessary fluff. The only minor inefficiency is repeating 'delete' in the purpose and returns, but overall it's appropriately sized.

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 destructive mutation tool with no annotations, the description covers the basic purpose and parameters adequately, and the output schema exists (so return values are documented elsewhere). However, it lacks critical behavioral context like permissions, reversibility, and side effects, which is a significant gap for a deletion operation.

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?

The schema description coverage is 0%, but the description compensates by clearly explaining both parameters: 'instance_id' accepts ID, label, or hostname with examples, and 'ipv4' specifies the address to delete. This adds meaningful context beyond the bare schema, though it doesn't cover validation rules (e.g., IPv4 format).

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 specific action ('Delete an IPv4 address') and the target resource ('from an instance'), which distinguishes it from sibling tools like 'delete' (general deletion) or 'delete_record' (DNS record deletion). The verb+resource combination is precise and unambiguous.

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 like 'convert_instance_ip' or 'detach_from_instance', nor does it mention prerequisites (e.g., the instance must be running, the IP must be assigned). It only states what the tool does, not when it's appropriate.

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