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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states a create/mutation action but omits prerequisites (operator credential implied by the undocumented dpop_token parameter), operator-scoped uniqueness behavior on 'name', and conflict/error behavior on duplicates — all material for a write operation.

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 seven-word sentence with zero filler, front-loaded with the verb and resource. Every word earns its place; 'operator-owned' carries real scoping weight rather than padding.

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?

For a 7-parameter mutation tool with no annotations and a silently undocumented dpop_token parameter, a one-sentence description is insufficient. The output schema covers return values, but the description omits the operator-authorization requirement and the implications of operator-scoped uniqueness, leaving an agent to guess at failure modes.

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 86% (six of seven parameters documented), so the baseline is 3 even though the description adds no parameter-level detail. The 'operator-owned' phrase loosely contextualizes operator scoping and the dpop_token parameter but does not document parameters itself.

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 names a specific verb ('Create') and a specific resource ('new operator-owned discount coupon'), and the 'operator-owned' qualifier distinguishes it from generic coupon operations. Sibling tools like update_coupon, delete_coupon, and redeem_coupon make its mint-vs-modify role unambiguous without opening the 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?

No explicit when-to-use/when-not-to-use guidance or named alternatives are present. The word 'new' and the create verb contrast implicitly with update_coupon, delete_coupon, and redeem_coupon siblings, so usage is implied rather than stated.

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