{
  "id": "member.is_administrator",
  "category": "operation_not_allowed",
  "summary": "The operation was rejected because the target user is a chat administrator.",
  "match_any": [
    {
      "error_code": 400,
      "description_exact": "Bad Request: user is an administrator of the chat"
    }
  ],
  "scope": {
    "method_examples": [
      "banChatMember",
      "restrictChatMember"
    ],
    "exhaustive": false
  },
  "possible_causes": [
    "The requested action targets a chat administrator."
  ],
  "diagnostic_limits": "The mapping does not identify the user’s exact administrative role or authorize changing it.",
  "evidence": [
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        130,
        132
      ],
      "note": "USER_ADMIN_INVALID becomes this description with code 400."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        85,
        106
      ],
      "note": "Uppercase machine-style 403 errors can become 400 before this rewrite."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        165,
        205
      ],
      "note": "Adds the code-specific prefix and lowercases only the initial character of ordinary messages."
    }
  ],
  "example": {
    "method": "banChatMember",
    "response": {
      "ok": false,
      "error_code": 400,
      "description": "Bad Request: user is an administrator of the chat"
    }
  },
  "evidence_level": "source_derived",
  "guidance": {
    "action": "review_target_member_role",
    "repeat_request": "after_relevant_change",
    "preconditions": [
      "Confirm the intended user and current role; any necessary role change must follow the chat’s authorization policy."
    ]
  }
}