x-portone-description
`x-portone-description` appears on operations and on schema objects and properties. Its value is a string. Used by a single provider across 1 OpenAPI document. It sits in the `x-portone-` namespace, so its meaning is defined by portone tooling rather than by OpenAPI. Observed values include `테스트 모드 여부를 결정합니다. true 이면 테스트 모드로 실행됩니다. Request Body에도 isForTest가 있을 수 있으나, 둘 다`, `날짜를 나타내는 문자열로, `yyyy-MM-dd` 형식을 따릅니다.`, `true 이면 테스트 모드로 실행되며, false 이거나 주어지지 않은 경우 테스트 모드를 사용하지 않습니다.`, `query 파라미터로 전달된 문서번호 유형. 기본 값은 TAX_INVOICE_ID이며 SUPPLIER, RECIPIENT, TAX_INVOICE`. Consistent with data & schema semantics — this is inferred from where the key appears and what it carries, not from any published definition.
Where it appears
| Location in the document | Occurrences | |
|---|---|---|
| operation | 272 | |
| response | 69 | |
| schema | 115 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| string | 456 |
Observed values
Sampled from the specifications, most frequent first.
Providers publishing it
All 1.
Why this is not in OpenAPI
Extensions exist because a provider needed something the specification would not carry. Most of what they hold is not the API contract at all — it is operational metadata about the contract: documentation, lifecycle, policy, provenance, and now agents. That metadata is usually better placed alongside the contract, in an Overlay or an APIs.json index, than crammed inside it. See everything else doing the data & schema semantics job.
Work with this as data
Every extension here is available over the APIs.io API and to AI agents over MCP. OpenAPI Extensions is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for openapi extensions
3 MCP tools reach this
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
curl "https://apis.io/api/v1/search?q=x-portone-description&limit=10"curl "https://apis.io/api/v1/tags/x-portone-description"Discovery needs no key. Ratings and market analysis are Pro.