Documentation & DX

x-ms-docs-key-type

`x-ms-docs-key-type` appears on parameter objects. Its value is a string. Used by a single provider across 70 OpenAPI documents. It sits in the `x-ms-` namespace, so its meaning is defined by ms tooling rather than by OpenAPI. Observed values include `group`, `drive`, `driveItem`, `site`. Consistent with documentation & dx — this is inferred from where the key appears and what it carries, not from any published definition.

Documentation & DX x-ms- namespace derived description
How this description was produced. It is assembled from what was measured in the corpus — where this key appears in a document, what shape its value takes, the values observed, and how many providers use it. It is not taken from a published definition, because for most extensions none exists. Read it as evidence, not as a specification. If you own this extension and want it described properly, tell us.
49979 occurrences
70 documents
1 providers
vendor-named

Where it appears

Location in the documentOccurrences
parameter 49979

What its value looks like

Value shapeOccurrences
string49979

Observed values

Sampled from the specifications, most frequent first.

groupdrivedriveItemsiteusersettermworkbookWorksheet

Providers publishing it

All 1.

microsoft-graph

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 documentation & dx job.