HKUDS/Vibe-Trading · warning · ValueError

Slack target channel name is empty

Error message

Slack target channel name is empty

What it means

Target resolution failed because the channel name, after normalization (strip, remove leading #/@, lowercase), is empty.

Source

Thrown at agent/src/channels/slack.py:232

        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
        while True:
            response = await self._web_client.conversations_list(
                types="public_channel,private_channel",
                exclude_archived=True,
                limit=200,
                cursor=cursor,
            )
            for channel in response.get("channels", []):
                if self._normalize_target_name(str(channel.get("name") or "")) == normalized:
                    channel_id = str(channel.get("id") or "")
                    if channel_id:
                        self._target_cache[cache_key] = channel_id

View on GitHub (pinned to 80ffdda44c)

Solutions

1. Pass a real channel name or ID, e.g. '#general' or 'C0123456789'
2. Validate user-supplied targets before sending
3. Check templating that produces empty channel names

Example fix

# before
await slack.send('#', ...)
# after
await slack.send('#general', ...)

if not target.strip().strip('#@'):
    raise ValueError('empty Slack target')

def is_valid_slack_target(t: str) -> bool:
    return bool(t and t.strip().strip('#@'))

except ValueError as e:
    if 'name is empty' in str(e):
        reject_user_input('invalid channel target')

When it happens

Trigger: Calling send()/target resolution with a target of '#', '@', whitespace, or an empty string.

Common situations: User input like '#' passed through, or config placeholder values such as '#{{channel}}' not being interpolated.

Related errors

• Slack target user handle is empty
• invalid alpha_id
• alpha_id not found
• invalid period: {exc}
• too many running benches; wait for one to finish

AI-assisted analysis of HKUDS/Vibe-Trading@80ffdda44c (2026-08-28). Data as JSON: /api/errors/f7fe33477324a6db. Report an issue: GitHub.