x-hidden-from-docs
`x-hidden-from-docs` appears on schema objects and properties. Its value is a boolean flag. Used by a single provider across 14 OpenAPI documents. 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 | |
|---|---|---|
| path | 19 | |
| schema | 163 | |
| operation | 11 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| boolean | 193 |
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 visibility job.