OpenClaw + Slack
Post to Slack from OpenClaw
Ask OpenClaw to write and schedule your Slack messages. BrokenPost connects the two, follows Slack's rules and posts at the time you pick.
How to connect OpenClaw to Slack
- 1
Connect Slack in BrokenPost. Add BrokenPost to your Slack workspace and pick a channel for each post.
- 2
In BrokenPost, open Plugins and copy your MCP URL.
- 3
Run the command below in your terminal.
- 4
Sign in to BrokenPost when asked and allow access.
- 5
Ask your OpenClaw agent to schedule a post.
openclaw mcp add brokenpost --url <MCP_URL> --transport streamable-http --auth oauth && openclaw mcp login brokenpostPrefer another way? See every way to connect OpenClaw.
What to ask OpenClaw
Type these in OpenClaw. Change the details to fit your messages.
- “Post this weekly update in #team on Slack every Monday at 9am.”
- “Share our launch post in #announcements when it goes live on LinkedIn.”
- “Send this chart to #marketing on Slack tomorrow morning.”
- “Every Monday at 9am, write a new Slack message about our product and schedule it.”
- “What Slack messages do I have scheduled for next week?”
What happens next
- 1
You ask in OpenClaw, in plain words.
- 2
OpenClaw lists the channels you connected in BrokenPost and picks your Slack account.
- 3
It reads Slack's rules and settings from BrokenPost, so the message fits Slack's limits before it is written.
- 4
If you shared a picture, a video or a link to one, it uploads it to your media library.
- 5
It creates the message as scheduled, as a draft, or to go out now, and gives you a preview link.
- 6
At the set time BrokenPost publishes it to Slack and it shows on your calendar.
Slack limits OpenClaw follows
OpenClaw reads these rules from BrokenPost before it writes, so the message fits the first time.
| Characters | 400,000 characters |
|---|---|
| Media | Pictures (PNG, JPG, GIF), no video |
| Video | Not supported |
| Channel | Pick one per post |
| Replies | Yes |
Slack settings you can ask for
Say them in plain words, like "channel", and OpenClaw sets them on the message.
- Channel
If Slack rejects a message
OpenClaw sees the same message and can fix the message for you.
| What you see | How to fix it |
|---|---|
| No video support for Slack, only images | Remove the video and attach a PNG, JPG or GIF. |
Good to know
- Slack only takes pictures here, not videos.
- Pick the channel in the Slack settings of the post.
- OpenClaw only posts when you ask. Ask for a draft to check the message in BrokenPost first.
Questions people ask
Can OpenClaw post to Slack directly?
Yes, through BrokenPost. Connect Slack in BrokenPost, connect BrokenPost to OpenClaw, and OpenClaw can schedule, draft or publish Slack messages.
Does OpenClaw know the Slack limits?
Yes. OpenClaw reads Slack's rules from BrokenPost before it writes: 400,000 characters and pictures (png, jpg, gif), no video. BrokenPost checks again before it posts.
Can OpenClaw schedule Slack messages for later?
Yes. Give a day and time, like "Friday at 6pm", and the message goes out then. Ask for a draft if you want to check it first.
Is it free?
OpenClaw with BrokenPost works on every plan. The Free plan includes 1 account on every app and 20 posts a month. Paid plans start at $19 a month with unlimited posts.
Which Slack settings can OpenClaw set?
Channel.
Can OpenClaw post a Slack thread or comments?
Yes. Ask for a thread or a first comment and BrokenPost posts each part as a reply, right after the first one.
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