x-position
`x-position` appears on parameter objects and on operations. Its value is an integer. Used by 3 providers across 11 OpenAPI documents. Observed values include `1`, `2`, `3`, `4`. Consistent with ordering & sorting — 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 | 127 | |
| requestBody | 24 | |
| parameter | 144 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| integer | 295 |
Observed values
Sampled from the specifications, most frequent first.
Providers publishing it
All 3.
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.