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

With no annotations, the description carries the full burden and does so unusually well: it discloses rate limits (10 calls/day/IP on preview), cost (1 credit / $0.02), the tier defaulting rule under payment or strict transport, the auth mechanisms (x402 payment, X-PAYMENT header, Bearer credits token), and the trial-credit fallback. The main risk surface of a paid tool is covered.

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?

Purpose and scope are front-loaded in the first clause, then tiers/pricing, then auth. Sized long for a 3-parameter tool and repeats some tier/payment detail already present in the schema, but nearly every sentence carries substantive, non-filler 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?

There is no output schema, yet the description enumerates the verdict outcomes and specifies exactly what the 'full' tier adds (momentum, shared-wallet risk flag, settlement evidence, AFTA-signed receipt). Combined with the auth and billing paths, an agent has everything needed to select and call it.

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 100%, so baseline is 3, but the description adds meaning the schema does not: the interaction between omitted tier, attached payment, and strict x402 transport resolving to paid billing, and where the payment payload is sourced. It does partly duplicate the tier description already in the schema.

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+resource pair: a 'signed trust verdict on one x402 publisher, over its OWN on-chain settlement index', and enumerates the exact verdict states (settling, quiet, registered-no-settlement, unreachable, missing Base payTo, not indexed). An agent can immediately tell this is a per-publisher ruling, distinct from the broader settlement tooling in the sibling list.

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: 'Requires a domain', plus the tier decision rules and what each tier returns. However it never explicitly routes against siblings such as x402_settlement_verdict or benchmark_trust_verdict, so the agent must infer this is the single-publisher case.

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