Vultr MCP

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

No annotations are provided, so the description carries the full burden. It discloses that the tool retrieves 'comprehensive registry information' with 'usage statistics and endpoints', which gives some behavioral context about the return data. However, it doesn't mention whether this is a read-only operation (implied by 'Get'), potential rate limits, authentication requirements, or error conditions. The description adds value but doesn't fully compensate for the lack of annotations.

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, parameter guidance, and return information in three distinct parts. It's appropriately sized for a single-parameter tool, with no redundant sentences. However, the 'Args:' and 'Returns:' labels are slightly verbose compared to integrating this information more seamlessly, and the sibling context isn't leveraged.

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 low complexity (single parameter, read operation), the description is reasonably complete. It explains the parameter semantics (compensating for 0% schema coverage), outlines the return data, and has an output schema (which handles return values). The main gap is the lack of behavioral context like rate limits or auth needs, but for a simple lookup tool, this is less critical.

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%, so the description must compensate. It explicitly documents the single parameter 'registry_identifier' in the 'Args:' section, explaining it accepts 'Registry name or ID' and providing the 'Smart identifier resolution' context. This adds significant meaning beyond the bare schema, covering the parameter's purpose and acceptable values. With only one parameter, this is nearly complete.

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 the verb 'Get' and resource 'comprehensive registry information including usage and configuration'. It specifies what information is retrieved, distinguishing it from other 'get' tools that focus on different resources like accounts, applications, or plans. However, it doesn't explicitly differentiate from potential sibling tools with similar registry-related functions (though none are listed among siblings).

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 implied usage context through 'Smart identifier resolution: Use registry name or ID', suggesting when to use this tool (for registry lookup by identifier). However, it lacks explicit guidance on when to use this versus alternatives (e.g., other 'get' tools for different resources), prerequisites, or exclusions. The sibling tools list includes many 'get_' tools, but no direct registry-specific alternatives are mentioned.

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