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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so safety is covered without the description. The description adds value by exposing the underlying endpoint (GET /coupons) and listing the payload fields, but says nothing about pagination, default page size, or result limits — which matters for a list 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?

Two compact fragments with zero padding and the resource stated first. The parenthetical is slightly ambiguous about whether those are returned fields or filters, but overall it is efficiently front-loaded.

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 field enumeration (name, discount, active state, redemptions) usefully previews the response shape, and all parameters are covered by the schema. Only a note on pagination/filtering behavior would make it fully complete.

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 100%, so all five parameters (page, sort, search, include, per_page) are fully documented in the schema itself. The description's parenthetical describes output fields rather than parameters, so it adds no parameter-level meaning beyond the schema — 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?

States a specific verb and resource ('List discount coupons') and even enumerates the fields returned, so an agent knows exactly what this returns. The coupon resource is clearly distinct from sibling list tools (orders, products, customers), though no sibling is named explicitly.

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?

There is no guidance on when to select this tool versus other list endpoints, and no mention of filtering behavior (search, include) that would help an agent decide it is the right call. Usage is only inferable from the name and resource.

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