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 of behavioral disclosure. While 'Get' implies a read-only operation, the description doesn't address important behavioral aspects like authentication requirements, rate limits, whether the data is real-time or cached, or what happens with invalid date parameters. The mention of 'service breakdown' in returns hints at output structure but lacks detail.

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 clear sections (Args, Returns) and uses minimal, purposeful sentences. The front-loaded purpose statement is clear, though the parameter documentation could be slightly more integrated rather than in a separate Args section.

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 read-only tool with 2 parameters and no output schema, the description covers the basic purpose and parameters adequately. However, without annotations and with multiple similar sibling tools, it lacks sufficient context about behavioral traits, differentiation from alternatives, and detailed output expectations beyond 'service breakdown'.

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 explicitly documents both parameters (year and month) with examples and constraints (month 1-12), which adds significant value since the schema has 0% description coverage. However, it doesn't explain parameter interactions (e.g., what happens for future months) or edge cases, keeping it at a baseline level of adequacy.

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' and the resource 'monthly usage and cost summary', making the purpose specific and understandable. However, it doesn't distinguish this tool from similar sibling tools like 'get_usage', 'get_current_month_summary', or 'get_last_month_summary', which appear to serve related functions.

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. With multiple sibling tools that seem related to usage and summaries (e.g., 'get_usage', 'get_current_month_summary', 'get_last_month_summary', 'analyze_costs'), there's no indication of when this specific monthly summary tool is appropriate versus those other options.

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