zdte.ai SPX Market Structure

Create Credit Checkout Link

create_credit_checkout

Create a payment link that adds prepaid credits to the authenticated key; a person opens it to pay. Does not charge or fund anything until payment is authorized and confirmed.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "credits": "<credits>"
    },
    "name": "create_credit_checkout"
  }
}

Input Schema

Name	Required	Description	Default
`credits`	Yes	Whole number of credits to buy, within the published minimum and maximum purchase. Each credit costs the published credit_unit_price_cents; the checkout total is credits times that price.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedInput schema / properties / credits / description

Previous value: -"Whole number of credits to buy, within the published minimum and maximum purchase. Each credit costs credit_unit_price_cents (see get_access_options); the checkout total is credits times that price."New value: +"Whole number of credits to buy, within the published minimum and maximum purchase. Each credit costs the published credit_unit_price_cents; the checkout total is credits times that price."

AddedSep 22, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false, so the mutation and safety profile are covered. The description adds genuinely useful non-annotation context: the deferred-effect semantics ('Does not charge or fund anything until payment is authorized and confirmed'). It does not cover link expiry, single-use, or reuse behavior, which keeps it from a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences with no filler; the core action is front-loaded and the deferred-charge caveat follows immediately. Every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema exists, but the description implies the return is a payment link a person opens, which is adequate for a single-parameter tool whose fee semantics are already stated. Link lifecycle details (expiry, single-use) would be the remaining gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

There is only one parameter and schema description coverage is 100% — the schema already explains the unit, min/max, and pricing math. The description adds no parameter-level detail beyond what the schema provides, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Create a payment link that adds prepaid credits') and describes the mechanism — a person opens the link to pay. An agent can distinguish this from siblings like subscribe_event or get_credit_balance without opening the schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies its use case (buying prepaid credits via a shareable link) but never states when to prefer it over alternatives such as subscribing via subscribe_event or checking balance first. Usage is inferable but not explicit, and there are no exclusions.

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

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