x-apikeyInfoFunc
`x-apikeyInfoFunc` appears on security schemes. Its value is a string. Used by 3 providers across 4 OpenAPI documents. Observed values include `athenian.api.controllers.security_controller.info_from_apiKeyAuth`, `core.api_security.api_key`, `core.auth.alloy_user_key`, `core.auth.api_key`. 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 | |
|---|---|---|
| securityScheme | 7 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| string | 7 |
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.