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

No annotations provided, so the description carries the full burden. It reveals core behaviors: free, requires npub proof, idempotent, records redemption, auto-applies discount. Lacks details on side effects, authorization beyond npub, or error handling. Adequate but not comprehensive.

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 (76 words), logically organized with clear sentences focusing on purpose, process, and constraints. No redundant or gratuitous text.

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?

Output schema exists, so return values need not be explained. The description covers the redemption flow, validation, idempotency, and auto-application. Slight omission of error scenarios or lifecycle details, but sufficient for a straightforward operation.

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 0%, so the description must add meaning. It explains the 'code' and 'npub' parameters but does not mention 'dpop_token'. This partially compensates for the missing schema descriptions, but leaves one parameter undocumented.

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 clearly states 'Claim a coupon by its name' with a specific verb (claim/redeem) and resource (coupon by code). It distinguishes from sibling tools like mint_coupon, delete_coupon, and list_coupons, establishing a unique purpose.

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 explains when to use (to claim a coupon), prerequisites (requires npub proof), and post-effect (auto-apply discount). It mentions idempotency and free usage but does not explicitly list when not to use; however, context from sibling tools provides implicit exclusions.

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