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

Annotations already declare non-read-only, non-idempotent, non-destructive, open-world. The description adds genuinely non-structured behavior: this call consumes one unit from a prepaid bundle token and skips the x402 payment path. It omits failure behavior (invalid/exhausted token), but given annotation coverage this is solid added context.

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?

Short and front-loaded with the critical token-gated marker. The 'no x402 payment' point is stated twice (in the bracket and again in the second sentence), which is mild redundancy but the whole thing remains tight.

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 token-redemption tool it covers the essentials: the token, the no-payment behavior, and the shared argument contract with the paid sibling. It leaves the token lifecycle (single-use vs reusable, exhaustion/invalid-token outcomes) unexplained, and there is no output schema to lean on for return semantics.

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 coverage is only 40%, with `limit`, `crypto_only`, and `entity_type` undocumented in both schema and description. The description partially compensates by pointing to `sanctions_delta` for 'same business arguments', but does not explain the undocumented parameters directly, so it lands at the baseline.

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 (redeem/spend) and resource (one sanctions_delta call from a prepaid bundle token), and names both the purchase sibling (`bundle_sanctions_delta_100`) and the paid equivalent (`sanctions_delta`). An agent can distinguish this from `bundle_redeem_sanctions_screen` and the paid tool 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?

Clearly signals the precondition (you hold a token bought via `bundle_sanctions_delta_100`) and the key exclusion (no x402 payment on this call, unlike the paid `sanctions_delta`). It does not cover what to do when the token is exhausted or how it compares to the other redeem sibling, so it stops just short of full when/when-not guidance.

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