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 states the tool purges all cached content, implying a destructive operation, but doesn't mention potential impacts like performance effects, permissions required, rate limits, or whether the purge is immediate or queued. This leaves significant gaps in understanding the tool's behavior.

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 details. It uses only three sentences with no wasted words, making it efficient and easy to scan. A slight improvement could be integrating the parameter explanation more seamlessly.

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 tool's destructive nature, no annotations, and no output schema, the description is incomplete. It lacks details on authentication needs, error handling, return value structure, or operational constraints, which are critical for safe and effective use in a CDN context.

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 explaining that 'zone_identifier' can be an origin domain, CDN domain, or UUID, adding useful semantic context beyond the basic string type in the schema. However, it doesn't provide examples or format details, keeping it at a baseline level.

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 action ('Purge all cached content') and resource ('from a CDN zone'), making the purpose specific and understandable. It distinguishes from siblings like 'delete_cdn_zone' by focusing on cache clearing rather than deletion. However, it doesn't explicitly contrast with other cache-related tools if they exist, keeping it from 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, such as partial cache purges or other CDN management tools. It mentions 'Smart identifier resolution' but doesn't explain when to choose this over other methods or tools, leaving usage context unclear.

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