Vultr MCP

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

With no annotations provided, the description carries full burden for behavioral disclosure. While 'reboot' implies a disruptive operation, the description doesn't mention downtime implications, permission requirements, whether the reboot is graceful or forced, or any rate limits. It only states it returns a status message, which is minimal behavioral context.

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 perfectly structured and front-loaded: the core purpose in one sentence, followed by clear Arg/Returns sections. Every sentence earns its place with no wasted words. The formatting with headings enhances readability without adding fluff.

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 operation with no annotations and an output schema, the description is minimally adequate. It explains the parameter well and mentions the return type, but doesn't address critical behavioral aspects like downtime, permissions, or error conditions. The presence of an output schema means it doesn't need to detail return values, but safety concerns remain under-documented.

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 and only 1 parameter, the description adds significant value by explaining that 'instance_id' accepts IDs, labels, hostnames, or UUIDs with concrete examples ('web-server', 'db.example.com', or UUID). This goes well beyond what the bare schema provides, though it doesn't clarify if all formats work equivalently.

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 ('reboot') and resource ('an instance'), making the purpose immediately understandable. It distinguishes from siblings like 'start' and 'stop' by specifying the reboot action. However, it doesn't explicitly differentiate from 'reboot_bare_metal_server' which appears to be a sibling tool for a specific server type.

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 'start', 'stop', or 'reboot_bare_metal_server'. There's no mention of prerequisites, consequences, or appropriate contexts for rebooting versus other power management operations.

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