One brief, a full Slack plan
Hermes breaks a goal into steps on its own: draft the messages, upload media, schedule each one and report back with what it queued for Slack.
SlackAutomate Slack with Hermes
Hand Hermes one brief and it plans the whole week: drafting Slack messages, scheduling them at the right times and reporting back when the queue is full.
Quick start
Install the CLI where Hermes executes commands, then hand over the Slack plan in plain language.
Terminal
npm install -g postqueenexport POSTQUEEN_API_KEY=your_api_key # A task for Hermes:# "Plan next week on Slack: draft five# messages, schedule them and list# what you queued"What Hermes can run on Slack
Windows that fit Slack
Tell Hermes when your channels are busiest and it schedules messages into that window on Slack, day after day, without reminders.
The right channels, every time
Hermes lists your connected channels before it posts, so messages land exactly where they should and announcements stay consistent.
Drafts until you are ready
Ask Hermes 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
Hermes calls postqueen to list your connected channels and sees what Slack supports, so drafts start from real capabilities, not guesses.
Draft with Hermes
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 Hermes can pull the results after.
What Slack allows
Hermes 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 Hermes connect Slack to postqueen?
Install the postqueen CLI where Hermes runs commands and export your API key. Every command returns JSON, so the agent can create, schedule and list Slack messages reliably.
Can Hermes 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 Hermes 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 Hermes can turn the same brief into Slack messages plus adapted versions for every other channel you run.
Does Hermes 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.
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.
Can postqueen post to private channels?
Yes, once the app has been invited. Someone in the private channel invites the postqueen app, and from then on scheduled messages land normally. A missing invite is the most common reason a private channel post fails.
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.
Seven days free. Cancel in one click from settings.