[Schema Inaccuracy] "Add labels to an issue" requestBody and description incorrect

Start by locating the OpenAPI definition for POST /repos/{owner}/{repo}/issues/{issue_number}/labels and compare its requestBody schemas and descriptions with the behavior documented in this issue. Done means the endpoint description, accepted forms, and minItems constraints accurately reflect the observed API behavior.

Schema Inaccuracy

For POST /repos/{owner}/{repo}/issues/{issue_number}/labels, the description is currently

Adds labels to an issue. If you provide an empty array of labels, all labels are removed from the issue.

and the requestBody is documented as

The names of the labels to add to the issue's existing labels. You can pass an empty array to remove all labels. Alternatively, you can pass a single label as a string or an array of labels directly, but GitHub recommends passing an object with the labels key. You can also replace all of the labels for an issue. For more information, see "Set labels for an issue.

and the schema specifies, in effect:

1. a lone $string
2. an array of $strings
3. an array of {name: $string}
4. an object with a single property labels whose value is an array of strings
5. an object with a single property labels whose value is an array of {name: $string}

incorrect description

First off, the descriptions (of both the endpoint and the requestBody) assert that passing an empty array will remove all the labels, this does not happen, it may have been copied over from the "set labels for an issue" endpoint.

incorrect minItems

On every array, the schema declares minItems: 1, this seems to be untrue for form (2) / (3) which does accept an empty array (it just does nothing), it is true for form 4/5

(1) is not valid

Trying to pass a naked string to the endpoint results in a validation error:

r = session.post(
    f'{pr.issue_url}/labels',
    json="test",
)

=>

{"message":"Invalid request.\n\nNo subschema in \"anyOf\" matched.\nFor 'anyOf/0', \"test\" is not an array.\nFor 'anyOf/1', \"test\" is not an array.\nFor 'anyOf/2', \"test\" is not an object.","documentation_url":"https://docs.github.com/rest/issues/labels#add-labels-to-an-issue"}

(5) is not valid

Trying to pass a nested record results in a validation error:

r = session.post(
    f'{pr.issue_url}/labels',
    json={"labels": [{"name": "test"}]},
)

=>

{"message":"Invalid request.\n\nNo subschema in \"anyOf\" matched.\nFor 'anyOf/0', {\"labels\"=>[{\"name\"=>\"test\"}]} is not an array.\nFor 'anyOf/1', {\"labels\"=>[{\"name\"=>\"test\"}]} is not an array.\nFor 'items', {\"name\"=>\"test\"} is not a string.","documentation_url":"https://docs.github.com/rest/issues/labels#add-labels-to-an-issue"}