HKUDS/nanobot · error · ValueError

Slack target channel name is empty

Error message

Slack target channel name is empty

What it means

Error "Slack target channel name is empty" thrown in HKUDS/nanobot.

Source

Thrown at nanobot/channels/slack/runtime.py:305

        if self._SLACK_ID_RE.fullmatch(target):
            if target.startswith(("U", "W")):
                return await self._open_dm_for_user(target)
            return target

        if target.startswith("#"):
            return await self._resolve_channel_name(target[1:])
        if target.startswith("@"):
            return await self._resolve_user_handle(target[1:])

        try:
            return await self._resolve_channel_name(target)
        except ValueError:
            return await self._resolve_user_handle(target)

    async def _resolve_channel_name(self, name: str) -> str:
        normalized = self._normalize_target_name(name)
        if not normalized:
            raise ValueError("Slack target channel name is empty")

        cache_key = f"channel:{normalized}"
        if cache_key in self._target_cache:
            return self._target_cache[cache_key]

        cursor: str | None = None
        web_api = self._require_web_api()
        while True:
            response = cast(dict[str, Any], await web_api.conversations_list(
                types="public_channel,private_channel",
                exclude_archived=True,
                limit=200,
                cursor=cursor,
            ))
            for channel_value in cast(list[object], response.get("channels", [])):
                channel = cast(dict[str, Any], channel_value)
                if self._normalize_target_name(str(channel.get("name") or "")) == normalized:
                    channel_id = str(channel.get("id") or "")

View on GitHub (pinned to 42f37dc4c0)

When it happens

Trigger: Thrown at nanobot/channels/slack/runtime.py:305 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of HKUDS/nanobot@42f37dc4c0 (2026-08-26). Data as JSON: /api/errors/2910a36b33c252e4. Report an issue: GitHub.