Run Slack from a chat message
OpenClaw executes the postqueen CLI on your own machine, so a single message can create, schedule or reschedule Slack messages with no dashboard open.
SlackAutomate Slack with OpenClaw
Message your agent from the chat apps you already use and it drafts, schedules and publishes Slack messages through postqueen while you get on with your day.
Quick start
Install the postqueen CLI on the machine OpenClaw runs on, then drive Slack from any chat thread.
Terminal
# Give OpenClaw the postqueen CLInpm install -g postqueenexport POSTQUEEN_API_KEY=your_api_key # Then message your agent:# "Draft three Slack messages about our# launch and schedule them for this week"What OpenClaw can run on Slack
Windows that fit Slack
Tell OpenClaw when your channels are busiest and it schedules messages into that window on Slack, day after day, without reminders.
The right channels, every time
OpenClaw lists your connected channels before it posts, so messages land exactly where they should and announcements stay consistent.
Drafts until you are ready
Ask OpenClaw for drafts only. They sit on the postqueen calendar unscheduled, so you can edit them and pick the time yourself, and nothing reaches your workspace members on Slack until you do.
Three steps to a full queue
Discover Slack
OpenClaw calls postqueen to list your connected channels and sees what Slack supports, so drafts start from real capabilities, not guesses.
Draft with OpenClaw
Give it the brief. The agent writes Slack-shaped messages and proposes publish times that match when your workspace members are around.
Check and publish
Look over the queue on the postqueen calendar and change anything you want. postqueen publishes each post at its time, and OpenClaw can pull the results after.
What Slack allows
OpenClaw reads these limits from postqueen before it composes, so a draft that would be rejected never reaches the queue.
- Message length
- Up to 40,000 characters per message through the Slack API
- Formatting
- Slack mrkdwn: bold, italics, code blocks, quotes and links
- File uploads
- Files up to 1 GB each
- Rate limit
- About one message per second per channel, with short bursts allowed
- App requirement
- The postqueen app must be installed in the workspace and invited to private channels
SlackEverything postqueen does on Slack
Scheduling, AI drafts, analytics and team roles, in one guide.
F.A.Q.
Frequently asked questions
How does OpenClaw connect Slack to postqueen?
Install the postqueen CLI where OpenClaw runs commands and export your API key. Every command returns JSON, so the agent can create, schedule and list Slack messages reliably.
Can OpenClaw schedule Slack messages at exact times?
Yes. Give it exact slots or a rule like mornings at nine and it sets publish times on the messages it creates, keeping your channels active on a steady rhythm.
Will OpenClaw publish to Slack on its own?
Only if you ask it to. Tell it to save drafts and nothing is scheduled: the messages wait on the calendar until you set a time. Tell it to schedule, and they go out at the times you can see, which is the setup most people move to once they trust the output.
Can one brief cover Slack and other channels too?
Yes. postqueen connects 30 channels, so OpenClaw can turn the same brief into Slack messages plus adapted versions for every other channel you run.
Does OpenClaw access cost extra on postqueen?
No. The agent uses your regular API key and plan limits: unlimited posts on every plan, and channel counts from 5 on Creator up to uncapped on Ultimate.
How does postqueen connect to Slack?
Through an official Slack app with OAuth. You approve the app for your workspace, pick the channels it can post to, and every scheduled message goes out through Slack's API. Nobody shares passwords and you can revoke access from Slack at any time.
Which Slack formats can I schedule?
Messages with full mrkdwn formatting (bold, italics, code blocks, quotes and links) plus images and file attachments. The composer previews the message, so what you see is what the channel gets.
Ready to get started?
Queue this week's posts in minutes, or hand the whole thing to your favorite AI. postqueen keeps publishing either way.
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