{
    "HELLO": {
        "summary": "Handshakes with the server.",
        "complexity": "O(1)",
        "group": "connection",
        "since": "6.0.0",
        "arity": -1,
        "function": "helloCommand",
        "history": [
            [
                "8.1.0",
                "A new `availability_zone` field is added to the response if the `availability-zone` config is set."
            ],
            [
                "6.2.0",
                "`protover` made optional; when called without arguments the command reports the current connection's context."
            ]
        ],
        "command_flags": [
            "NOSCRIPT",
            "LOADING",
            "STALE",
            "FAST",
            "NO_AUTH",
            "SENTINEL",
            "ALLOW_BUSY"
        ],
        "acl_categories": [
            "CONNECTION"
        ],
        "reply_schema": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "server": {
                    "type": "string"
                },
                "version": {
                    "type": "string"
                },
                "proto": {
                    "const": 3
                },
                "id": {
                    "type": "integer"
                },
                "mode": {
                    "type": "string"
                },
                "role": {
                    "type": "string"
                },
                "modules": {
                    "type": "array",
                    "items": {
                        "type": "object",
                        "additionalProperties": false,
                        "properties": {
                            "name": {
                                "type": "string"
                            },
                            "ver": {
                                "type": "integer"
                            },
                            "path": {
                                "type": "string"
                            },
                            "args": {
                                "type": "array",
                                "items": {
                                    "type": "string"
                                }
                            }
                        }
                    }
                }
            }
        },
        "arguments": [
            {
                "name": "arguments",
                "type": "block",
                "optional": true,
                "arguments": [
                    {
                        "name": "protover",
                        "type": "integer"
                    },
                    {
                        "token": "AUTH",
                        "name": "auth",
                        "type": "block",
                        "optional": true,
                        "arguments": [
                            {
                                "name": "username",
                                "type": "string"
                            },
                            {
                                "name": "password",
                                "type": "string"
                            }
                        ]
                    },
                    {
                        "token": "SETNAME",
                        "name": "clientname",
                        "type": "string",
                        "optional": true
                    }
                ]
            }
        ]
    }
}
