Gemini + Slack
Post to Slack from Gemini
Ask Gemini 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 Gemini 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
Add the config below to ~/.gemini/settings.json.
- 4
Start Gemini CLI and run /mcp auth brokenpost to sign in.
- 5
Ask Gemini to schedule a post.
{
"mcpServers": {
"brokenpost": { "url": "<MCP_URL>" }
}
}Prefer another way? See every way to connect Gemini.
What to ask Gemini
Type these in Gemini CLI. 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.”
- “Write a Slack message about the file I just shared and schedule it for tomorrow at 9am.”
- “What Slack messages do I have scheduled for next week?”
What happens next
- 1
You ask in Gemini CLI, in plain words.
- 2
Gemini 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 Gemini follows
Gemini 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 Gemini sets them on the message.
- Channel
If Slack rejects a message
Gemini 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.
- Gemini only posts when you ask. Ask for a draft to check the message in BrokenPost first.
Questions people ask
Can Gemini post to Slack directly?
Yes, through BrokenPost. Connect Slack in BrokenPost, connect BrokenPost to Gemini, and Gemini can schedule, draft or publish Slack messages.
Does Gemini know the Slack limits?
Yes. Gemini 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 Gemini 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?
Gemini 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 Gemini set?
Channel.
Can Gemini 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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