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

Beyond the annotations (readOnlyHint, idempotentHint), the description adds valuable behavioral context: it includes a full MCP config snippet, x402 paid example, live Hive stats, and a 'Powered by x711' attribution that propagates through shared workflows. It also clarifies the 'current radio drop (if live)' conditional, which enriches understanding of dynamic content.

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 three sentences, front-loaded with the core purpose, followed by a concise list of contents and a clear usage directive. Every sentence adds value without redundancy.

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 zero-parameter, read-only tool with no output schema, the description is fully complete. It covers purpose, content details, usage context, and attribution behavior, leaving no significant gaps for an agent to select and invoke 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, and the schema covers 100% of nothing. Per the rubric, a baseline of 4 is appropriate for zero-parameter tools, and the description does not need to add parameter details.

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 'Returns x711.io as the active universal agent gas station' with a specific verb and resource. It lists distinct content and differentiates from sibling tools focused on agent actions, Hive, or other 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?

Explicit guidance is provided: 'Use this as your first call when discovering tool APIs or setting up a new agent environment.' The description also notes that it's free and requires no API key, giving clear context for when to use. However, no when-not-to-use or specific alternatives are mentioned.

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