VULK MCP Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions that the tool 'Get a link' which implies a read operation, but doesn't clarify if this initiates a subscription process, requires authentication, has rate limits, or what happens when invoked. The credit usage context is helpful but insufficient for a mutation-related tool like subscription management.

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 concise with two sentences that each serve a purpose. The first sentence states the core functionality, and the second provides important context about credit usage. There's no wasted verbiage, though it could be slightly more structured with clearer separation between tool purpose and contextual 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?

For a subscription tool with no annotations and no output schema, the description provides basic functionality but lacks important context. It explains what the tool does and gives credit usage context, but doesn't cover what happens after getting the link, whether authentication is required, what the response format is, or how this integrates with the broader system. The credit information helps but doesn't fully compensate for missing behavioral details.

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?

With 100% schema description coverage and only 1 parameter, the baseline is high. The description adds valuable context about credit usage (simple apps ~100 credits, complex ones ~500+) which helps users understand what they're subscribing to beyond just the plan names. This provides meaningful semantic context that the schema's enum values alone don't convey.

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 states the tool 'Get a link to upgrade your VULK plan' which provides a clear verb+resource combination. However, it doesn't distinguish this from sibling tools like 'usage' or 'deploy' that might also relate to plan management. The description adds credit usage context but doesn't explicitly differentiate this subscription tool from other plan-related operations.

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. There's no mention of prerequisites, when this should be used instead of other tools, or what scenarios warrant upgrading a plan. The credit usage information is helpful context but doesn't constitute usage guidelines for tool selection.

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