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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the read-only safety profile is established. The description adds 'live status' and 'after checkout' context, which is useful, but it does not disclose any potential latency, polling behavior, or ordering semantics beyond what annotations already cover.

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?

A single sentence front-loads the core behavior ('Returns one domain purchase's live status') and then supplies the canonical use case. There is no filler or repetition of schema/annotation 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?

The tool is a simple read-only lookup, has an output schema, and carries safety annotations, so the description does not need to detail return formatting. It gives the essential after-checkout context, though the undocumented domain parameter is a minor completeness gap.

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?

Schema description coverage is only 50%: companyId is described as a 'UUID value wrapper', but domain has no description and the tool description does not explain either parameter. It is not explicit that domain identifies the purchase or what happens when it is omitted, so the description fails to compensate for the schema gap.

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 uses a specific verb ('Returns') and identifies the precise resource ('one domain purchase's live status'), which clearly differentiates it from broad list, availability, and transfer-related sibling tools. The user-facing question 'did my domain go through?' makes the purpose immediately actionable.

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?

It clearly establishes the intended context: use after checkout to confirm whether a purchased domain went through. However, it does not explicitly name sibling alternatives such as formation_get_domain_transfer_status or list/availability tools, so no when-not-to-use guidance is provided.

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