Slack Integration

The Slack node lets your agents send messages to channels, users, and threads — including scheduled messages and rich Block Kit layouts.

Connection Setup

Standard OAuth via Spawnbase. When you connect Slack, the bot is added to your workspace and can post to any channel it’s been invited to.

Note

The bot auto-joins channels when sending. If a message fails with a “not in channel” error, manually invite the bot with /invite @Spawnbase.

Available Actions

Action	Description
Send Message	Send a message to a channel or user

Key Fields

Field	Required	Description
Channel	Yes	Channel ID (C123...) or User ID (U123...) — loads dynamically from your workspace
Text	Yes	Message content. Required even when using Blocks.
Blocks	No	Block Kit JSON payload for rich layouts
Thread Timestamp	No	Reply to a specific thread (1403051575.000407 format)
Schedule At	No	ISO 8601 timestamp or UNIX seconds to schedule the message for later

Tips

• Channel ID, not name — use the channel ID (C0123ABC), not #general. Find it in Slack: channel name → About → scroll to bottom.
• Scheduled messages — set the Schedule At field to send later. The bot must stay in the channel until delivery.
• Thread replies — pass Thread Timestamp to reply in a thread. Enable Reply Broadcast to also post to the channel.