json_schema _retrieve_ref fails to process list element with dict lookup method #32012
Description
Relates to Softeria/ms-365-mcp-server#36.
It fails when process API definition from MCP server like below. When $ref element in list (ccRecipients refers bccRecipients), should use index related check.
{
"tools": [
{
"name": "send-mail",
"description": "Send the message specified in the request body using either JSON or MIME format. When using JSON format, you can include a file attachment in the same sendMail action call. When using MIME format: This method saves the message in the Sent Items folder. Alternatively, create a draft message to send later. To learn more about the steps involved in the backend before a mail is delivered to recipients, see here.",
"inputSchema": {
"type": "object",
"properties": {
"body": {
"anyOf": [
{
"type": "string"
},
{
"type": "object",
"properties": {
"Message": {
"type": "object",
"properties": {
"bccRecipients": {
"type": "array",
"items": {
...
},
"description": "The Bcc: recipients for the message."
},
"ccRecipients": {
"type": "array",
"items": {
"$ref": "#/properties/body/anyOf/1/properties/Message/properties/bccRecipients/items"
},
"description": "The Cc: recipients for the message."
}
},
"additionalProperties": false
},
"SaveToSentItems": {
"type": [
"boolean",
"null"
],
"default": false
}
},
"additionalProperties": false
}
]
}
},
"required": [
"body"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
},
"annotations": {
"title": "send-mail",
"readOnlyHint": false
}
}
]
}