Slack Post

Send one text message through Slack's official chat.postMessage endpoint.

Safety

• Post only when the user or parent agent explicitly requests an external Slack message.
• Keep SLACK_BOT_TOKEN in the process environment. Never print, inspect, or pass it as an argument.
• Use the configured bot token. Do not substitute a user token or another app's token.
• Treat the selected channel and any mentioned member as externally visible recipients.
• Use --format json when another tool must parse the response.

Requirements

• Use Node.js 18 or newer. No package install is required.
• Grant the Slack app chat:write.
• Add the bot to the target conversation. Grant chat:write.public only when the app must post to public channels it has not joined.
• Load these values into the process environment before running the script: