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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds the scope ('single domain') and output focus ('registrability and price') but no further behavioral traits such as rate limits or error handling, so it offers modest value beyond annotations.

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 sentences: the first states the action and scope, the second reinforces authority, and the Related line adds cross-reference. No extraneous text.

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 a single parameter, a complete schema description, strong annotations, and an output schema present, the description adequately covers what the tool does and when to use it. The related-tools pointer adds contextual completeness.

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 only parameter, 'domain', is fully documented in the schema with format example. The description adds no additional parameter semantics, leaving this at the baseline for high schema coverage.

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 'Confirm a single domain's registrability and price' with a specific verb and resource, and explicitly contrasts with bulk_available, whois, and monitor via the 'Related' line, effectively distinguishing this tool from siblings.

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 notes it is for a single domain, implying bulk_available is for multiple, and lists whois and monitor as related alternatives. This provides clear context for when to use this tool, though it stops short of explicit 'use X instead' guidance.

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