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. While it indicates this is a search/read operation (implied by 'Search' and 'Returns'), it doesn't disclose important behavioral traits like whether this requires authentication, what happens when no matches are found, whether results are paginated, rate limits, or performance characteristics. The description adds minimal behavioral context beyond the basic operation.

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 concise. It opens with a clear purpose statement, then provides a well-organized Args section with bullet-like clarity for each parameter, followed by a Returns statement. Every sentence earns its place, with zero wasted words or redundant 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 moderate complexity (4 parameters, search operation) and the presence of an output schema (which handles return value documentation), the description is adequate but has gaps. It covers parameters well and states the return type, but lacks behavioral context (authentication, error handling, pagination) and usage guidance. For a search tool with no annotations, more behavioral disclosure would be beneficial.

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 description provides excellent parameter semantics despite 0% schema description coverage. It clearly explains all 4 parameters with their purposes and units (vCPUs, MB, GB, USD), adding crucial meaning that the bare schema lacks. The Args/Returns structure effectively documents what each parameter controls and what the tool returns, fully compensating for the schema's lack of descriptions.

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 as 'Search plans by specifications' which is a specific verb+resource combination. It distinguishes itself from sibling tools like 'compare_plans' or 'get_plan' by focusing on filtering by technical specifications rather than comparison or retrieval of a single plan. However, it doesn't explicitly differentiate from 'search_bare_metal_plans' which appears to be a similar search tool for a different resource 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. It doesn't mention when this search is appropriate compared to other plan-related tools like 'list_plans', 'compare_plans', or 'get_cheapest_plan', nor does it specify any prerequisites or contextual requirements for using this search functionality.

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