x-audience
`x-audience` appears on server objects and on operations. Its value is a string. Used by 27 providers across 102 OpenAPI documents. Observed values include `business-unit-internal`, `public`, `external-public`, `external-partner`. 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 | |
|---|---|---|
| info | 98 | |
| schema | 56 | |
| server | 175 | |
| tag | 5 | |
| path | 16 | |
| other | 5 | |
| operation | 158 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| string | 435 |
| object | 2 |
| array | 76 |
Observed values
Sampled from the specifications, most frequent first.
Providers publishing it
All 27.
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.