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

With no annotations provided, the description carries the full burden of behavioral disclosure. It usefully states that both active and exhausted redemptions are returned, enumerates the possible per-row status values, and notes that the operation is free and requires npub proof. It does not mention pagination or error behavior, but the core behavior is well disclosed.

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?

The description is concise and front-loaded with the purpose, followed by a compact status vocabulary and a short cost/auth note. Every sentence adds useful information without filler.

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 simple two-parameter listing tool with an output schema present, this description is nearly complete: purpose, return statuses, and proof requirement are all covered. The main gaps are the role of dpop_token and a clearer word about which sibling tools it should be preferred over.

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?

The schema description coverage is 0%, so the description must add parameter meaning. It does clarify that npub is the required proof identifier, which is helpful. However, the optional dpop_token is left unexplained, and the description does not fully compensate for the schema's lack of semantic detail.

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 opens with a specific verb and resource: 'List the coupons this patron has redeemed on this operator.' It further clarifies the scope by saying it returns both active and exhausted redemptions. However, it never explicitly distinguishes itself from the sibling goodearth_list_coupons, so sibling differentiation is only implicit.

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 description implies its use case: checking a patron's redeemed coupon statuses, with statuses like active and exhausted. It does not explicitly state when to use this instead of alternatives, nor does it mention exclusions, leaving routing decisions to the agent.

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