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

No annotations are provided, so the description carries the full burden. It does not state that the call is read-only, has no side effects, requires account authentication, is paginated, or what the response shape is; it merely names three fields, which is insufficient behavioral context for a zero-annotation tool.

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?

One front-loaded sentence with no filler. It efficiently communicates scope ('on this account') and returned fields in a single clause.

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 output schema and no annotations, the description should explain the return data; it names price, status, and expiry, which is a reasonable summary for a simple zero-parameter read. It omits the collection structure (list/array), ordering, and pagination, leaving minor gaps, but the tool's low complexity keeps this close to sufficient.

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?

There are zero parameters and 100% schema description coverage, so the baseline of 4 applies. The description adds no parameter information, which is appropriate because none exist.

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 the resource (domains bought through Plinth on this account) and the returned fields (price, status, expiry) in one phrase, so an agent can infer this is a read tool for order records. However, it never uses an explicit verb like 'list' or 'get' and does not mention or contrast with the sibling domains.list, so sibling differentiation is absent.

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?

Provides no when-to-use guidance and never names domains.list, domains.buy, or any alternative. The only hint is the word 'bought', which distinguishes historical orders from currently managed domains, but that is inference rather than instruction.

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