{
  "id": "chat.not_found",
  "category": "target_resolution",
  "summary": "The bot could not resolve this chat.",
  "match_any": [
    {
      "error_code": 400,
      "description_exact": "Bad Request: chat not found"
    }
  ],
  "scope": {
    "method_examples": [
      "sendMessage",
      "getChat"
    ],
    "exhaustive": false
  },
  "possible_causes": [
    "An upstream lookup error was replaced with the generic chat lookup message.",
    "A username resolved to a chat type that this lookup does not allow."
  ],
  "diagnostic_limits": "This is not proof that the chat was deleted, the bot was blocked, or the identifier is permanently unusable.",
  "evidence": [
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        7239,
        7266
      ],
      "note": "A fallback masks upstream 400-class errors, and a separate local branch emits the same description."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        85,
        108
      ],
      "note": "Some upstream codes are converted to 400 before the fallback description is applied."
    }
  ],
  "example": {
    "method": "getChat",
    "response": {
      "ok": false,
      "error_code": 400,
      "description": "Bad Request: chat not found"
    }
  },
  "evidence_level": "source_derived",
  "guidance": {
    "action": "inspect_target_and_access",
    "repeat_request": "after_relevant_change",
    "preconditions": [
      "Verify the identifier, target type and bot access before changing stored chat records."
    ]
  }
}