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

With no annotations, the description carries the full behavioral burden and does well: it discloses the effect is cosmetic and reversible, that the coupon survives at the operator, that the operation is free, and that it requires proof of npub. It omits idempotency and error/failure behavior, but the mutation's nature and prerequisites are clearly conveyed.

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 paragraphs with the effect stated first and the caveats second; no filler sentences. Every clause (cosmetic, still exists, re-redeemable, free, npub proof) adds distinct information.

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?

An output schema exists, so return values need no explanation, and the behavioral effect is well covered. However, with 0% schema description coverage, the description leaves coupon_id and dpop_token entirely undefined, which is a real gap for a 3-parameter mutation tool.

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 compensate for all three parameters. It only touches 'npub' (as a proof requirement) and never explains coupon_id or dpop_token, leaving two of three parameters undocumented anywhere.

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 ('Remove a coupon from this patron's redemption list') and immediately qualifies the scope so it is not confused with destructive siblings like beesknees_delete_coupon, noting the coupon still exists at the operator. An agent can distinguish this from deletion or redemption without opening any 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?

Gives clear context for when this applies: purely cosmetic removal, reversible because the patron can re-redeem while the window allows. It does not explicitly name an alternative tool (e.g. use delete_coupon to actually destroy it) or state exclusions, so it falls short of full routing guidance.

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