pay-with-x402Before calling any Vybe endpoint without an API key (e.g. AI agent, throwaway script, premium-only path), use this to access the same endpoint via x402 pay-per-call USDC on Solana.
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description claims a financial transaction ('pay-per-call USDC') while annotations declare readOnlyHint: true, implying no side effects. This is a direct contradiction. The annotation's read-only hint would mislead an agent into thinking no payment occurs, conflicting with the clear payment intent.
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 a single sentence, front-loaded with the usage condition, and every clause adds value. No redundancy or filler.
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?
The description lacks critical context: it does not state what the tool returns after payment (no output schema exists), nor how the tool knows which endpoint to pay for given zero parameters. An agent cannot determine the next step after calling this tool. The contradiction with readOnlyHint further degrades completeness.
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?
There are zero parameters, and the schema coverage is 100% (empty schema). The description does not need to explain parameter syntax, but it references 'the same endpoint' without clarifying how that endpoint is identified given the absence of parameters, which is a minor gap. Baseline for 0 params is 4.
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 function: accessing Vybe endpoints via x402 pay-per-call USDC. It uses a specific verb ('use this to access') and a distinct mechanism (x402 pay-per-call), which differentiates it from sibling tools like execute-request or get-endpoint.
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 explicitly states when to use the tool: 'Before calling any Vybe endpoint without an API key', with examples (AI agent, throwaway script, premium-only path). It implicitly covers when not to use it (when you have an API key) by specifying the condition.
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 clearly distinct role: list-endpoints enumerates all paths, search-endpoints finds specific ones, get-endpoint retrieves details, execute-request makes actual API calls, and pay-with-x402 handles payment. There is no real overlap between these actions.
Most tool names follow a consistent lowercase verb-first hyphenated pattern (execute-, get-, list-, search-). pay-with-x402 is a minor deviation with a phrasal verb, but it still maintains the overall verb-led style.
Five tools is an appropriate count for a focused API client server. Each tool serves a distinct purpose in the discovery-to-execution workflow, earning its place without excess or deficiency.
The tool set covers the complete workflow: discovering endpoints, getting endpoint details, managing access via payment, and executing requests. This allows agents to fully explore and call any Vybe API endpoint with no obvious dead ends.