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

No annotations are provided, so the description carries the burden of behavioral disclosure. It mentions the tool will convey limits and capabilities, but it doesn't disclose whether the tool is read-only, has side effects, or what the response format is. The nature of an info tool implies no side effects, but this is not explicitly stated.

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 two sentences, extremely concise, and front-loaded with 'Start here.' Every word adds value, making it an exemplary model of efficiency.

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 simple no-parameter informational tool, the description is largely complete. It defines the tool's purpose and when to use it. It could be more explicit about the tool's read-only nature, but the content is sufficient for an agent to select and invoke it correctly.

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 tool has zero parameters, so the baseline score is 4 per the rubric. There is no need for the description to explain parameters, and the schema confirms an empty properties object.

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 identifies this tool as an informational starting point, stating it provides 'what this server sells, what it will not do, and the exact limits.' This distinguishes it from sibling tools by positioning it as the entry point for understanding the service, though it lacks a specific verb for an operation.

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 phrase 'Start here' explicitly instructs the agent to use this tool first before others, providing clear usage context. It doesn't explicitly name alternatives or exclusions, but the directive to start here is sufficient guidance for when to use this tool.

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