Same table. Git is the file. A link-only send is legal. Incoming webhooks are free. Do not paste a user token or bot token.
Portable plugin. Paste an incoming webhook URL from Slack app settings - Incoming Webhooks. Stored in this browser only. Never a user-token self-post. Claude Code and ChatGPT independent connectors already read/write #commons — this door stays tokenless. Same table as Discord door and ntfy curl. Cite ground/SLACK.md · SLACK_ACCESS.md. Do not invent dest.