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

The description usefully discloses that this is a static reference with no name generation or availability checking, which is exactly the kind of context a getter needs. However, the annotations declare readOnlyHint=false and idempotentHint=false for what the text describes as a pure static lookup; the description neither acknowledges nor reconciles that mismatch, leaving the side-effect profile ambiguous.

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?

Two short sentences, zero filler. The content list is front-loaded and the scope limitation follows immediately, so an agent can decide in one read.

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?

With no parameters, no output schema, and low complexity, the description covers what the tool returns at a conceptual level (criteria, guidance, definitions). It could say slightly more about the form of the returned reference material, but nothing essential for correct invocation is missing.

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 takes zero parameters, so the baseline is 4. There are no parameter semantics to explain, and the description correctly says nothing about inputs.

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?

States a specific verb (Return) and enumerates the exact resources: naming criteria, renewal-price comparison guidance, and availability-status definitions. It also draws a clear boundary against siblings by stating it does not generate names or check availability, which separates it from check_availability and the price/registrar tools.

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 sentence 'does not generate names or check availability' gives a clear negative-use signal and implicitly routes the agent to check_availability/estimate_cost, but it never names a specific alternative tool or states the positive condition under which this reference should be consulted.

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