Vultr MCP

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

No annotations are provided, so the description carries full burden. It states it's a read operation ('Get details'), which is clear, but lacks critical behavioral details: whether it requires authentication, rate limits, error handling (e.g., invalid ID), or what 'details' include (e.g., OS version, family). For a tool with no 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 appropriately sized and front-loaded: the first sentence states the purpose clearly, followed by structured Args and Returns sections. There's no wasted text, though the structure is basic. It could be more polished but efficiently conveys key information.

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-only operation) and the presence of an output schema (which handles return values), the description is minimally complete. However, with no annotations and low schema coverage, it should provide more behavioral context (e.g., auth needs) to be fully helpful, making it just adequate.

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%, but the description adds minimal value: it states 'os_id: The operating system ID', which clarifies the parameter's purpose beyond the schema's type-only definition. However, it doesn't explain format (e.g., numeric, string pattern) or where to obtain the ID, leaving gaps. With one parameter and low schema coverage, this is baseline adequate.

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 ('Get details') and resource ('operating system'), making the purpose understandable. It distinguishes from siblings like 'list_operating_systems' (which lists multiple) and 'get_os_by_name' (which uses name instead of ID). However, it doesn't explicitly mention this distinction, so it's not a perfect 5.

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. While the description implies it's for retrieving details of a specific OS by ID, it doesn't mention when to choose this over 'get_os_by_name' or 'list_operating_systems', nor does it discuss prerequisites like needing a valid OS ID.

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