x-apifox-ignore-properties
`x-apifox-ignore-properties` appears on schema objects and properties. It is used as a marker with no value. Used by 2 providers across 10 OpenAPI documents. It sits in the `x-apifox-` namespace, so its meaning is defined by apifox tooling rather than by OpenAPI. Consistent with visibility — 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 | |
|---|---|---|
| schema | 206 | |
| response | 53 | |
| requestBody | 4 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| empty | 259 |
| array | 4 |
Providers publishing it
All 2.
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 visibility job.