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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description contributes beyond that by disclosing the response shape (fields and cross-links to voiding/returned receipts) and the underlying endpoint GET /receipts/{uuid}. It stops short of noting pagination, auth, or error behavior, keeping it below a 5.

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 front-loaded sentence does the work: the resource leads, the returned fields follow, then the sibling routing, then the endpoint. The colon-list style is slightly telegraphic and the trailing REST path is marginal, but nothing is wasted or buried.

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, the description carries the burden of describing returns, and it does so by naming the fields and the linked voiding/returned receipts. For a one-parameter read tool with full annotation coverage, an agent has everything needed to call it 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?

With one parameter at 100% schema description coverage, the schema already tells the agent the uuid comes from acube_list_receipts. The description only restates 'by uuid' and adds no format or constraint detail beyond the schema's 1-120 character bounds, so the baseline 3 applies.

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?

Specific verb-plus-resource ('one electronic receipt by uuid') with an enumeration of exactly what comes back: type, status, number, date, total, and voiding/returned links. It also carves itself apart from acube_get_receipt_details by naming the missing payload (line items), so the agent can distinguish the two without opening either schema.

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 parenthetical '(no line items: use acube_get_receipt_details)' names the alternative explicitly and states the condition that selects it. That is the same routing pattern as the high-quality calibration example, and nothing about when to pick this tool is left to inference.

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