Pay with USDC over HTTP instead of XRP: the x402 purchase rail (Base). Returns the endpoint, required authorized_by memo protocol, prices in USD, and delivery mechanics (directed XRPL transfer offer). You still need an XRPL address to hold the seal.
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It explains that the tool returns information (endpoint, memo protocol, prices, delivery mechanics) and mentions a prerequisite (needing an XRPL address to hold the seal). However, it does not explicitly state side-effect-free behavior, error conditions, or other operational traits, so a minor gap remains.
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, consisting of three sentences that quickly convey purpose, return contents, and a prerequisite. While the opening phrase 'Pay with USDC over HTTP' is slightly promotional, every sentence provides useful information without unnecessary fluff.
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 zero-parameter info tool with no output schema, the description is fairly complete: it enumerates exactly what data is returned and the key requirement (XRPL address). It does not mention output format or error handling, but given the simplicity of the tool, this is sufficient. The main shortfall is the lack of explicit alternative tool guidance, but that overlaps with usage guidelines.
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 tool has zero parameters, and the input schema is an empty object with 100% coverage by default. According to the baseline, 0 params warrant a score of 4. The description does not need to explain parameters; it instead clarifies the return value, which is appropriate here.
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 the tool's purpose: it returns details about the x402 USDC-over-HTTP purchase rail, specifically the endpoint, memo protocol, USD prices, and delivery mechanics. This distinguishes it from sibling tools like get_buy_transaction or verify_seal, which concern different aspects of the payment/seal lifecycle.
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 usage context ('Pay with USDC over HTTP instead of XRP') but does not explicitly state when to use this tool versus alternatives or provide exclusions. It mentions the alternative payment rail (XRP) but lacks direct comparison to sibling tools, leaving the use case somewhat implied rather than explicit.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
Each tool has a unique, clearly defined purpose: listing, single-item retrieval, purchase transaction construction, USDC payment info, refusal ledger access, and verification. No two tools overlap in functionality, and the descriptions clearly distinguish the two purchase-related tools (XRPL vs. USDC/HTTP).
All tool names follow a consistent verb_noun pattern (get_*, list_*, verify_*), with 'get' used for retrieval and specific actions named with clear nouns. The minor variation (list vs. get) is standard and predictable.
Six tools is a well-scoped size for this niche collection server. Each tool covers a distinct part of the user journey (browse, inspect, purchase, verify, and inspect constraints), with no redundancy or bloat.
The server covers the full lifecycle for interacting with the Twelve Permissions collection: listing, individual metadata retrieval, two purchase methods (XRP and USDC), verification, and additionally the refusals ledger. There are no obvious gaps for the stated domain of viewing and buying these NFTs.