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Post to Slack from Grok Bot

Grok Bot can post to Slack channels through the Postiz plugin. Add the plugin to a Bot, store your Postiz API key as a secret, and name the channel. The Bot resolves the channel ID, drafts the message, attaches media, schedules it in Postiz, and can run recurring team updates from its own cloud computer.

Setup Guide Marketplace

Please make sure there is always a human in the loop.

Last updated: September 2026

How to post to Slack from Grok Bot

Add the Postiz plugin once, then name the Slack channel and what to post. The Bot resolves the channel ID from Postiz and schedules the message.

Setup, then just ask

# One-time setup, in any Bot chat
/add-plugin postiz
# Store POSTIZ_API_KEY as a Bot secret when prompted

# Then just ask Grok Bot:
> Post the weekly update to #general
  on Slack tomorrow at 9am

Grok Bot: Done! Your Slack post is scheduled.

What can Grok Bot do on Slack?

📢

Channel Messaging

Post messages to any Slack channel your bot has access to. Share updates, announcements, and notifications automatically.

⏰

Scheduled Messages

Schedule messages for the perfect time. Queue up announcements, reminders, and updates to post when your team is most active.

🖼

Media Sharing

Attach images, files, and rich media to your Slack messages. Share screenshots, reports, and visual updates with your team.

👥

Team Communications

Automate recurring team updates, standup summaries, and status reports across multiple channels simultaneously.

🤖

Bot Integration

Leverage Slack bot tokens for seamless posting. Your AI agent authenticates once and posts on behalf of your workspace.

📅

Multi-Channel Posting

Target different channels for different content types. Send engineering updates to #dev and marketing wins to #general.

How does Grok Bot post to Slack?

You describe what you want in plain language and Grok Bot handles the Postiz calls for you. Here is how a typical conversation goes.

Find Your Slack Integration

Ask Grok Bot whether your Slack account is connected. It also checks which options the platform supports.

Example conversation

> Is my Slack account connected to Postiz?

Grok Bot: Yes — your Slack account is connected
  and ready. Want me to post something?

Choose Your Channel

Identify the Slack channel ID where you want to post. You can find channel IDs in Slack by right-clicking a channel and selecting 'View channel details'.

Example conversation

> Draft a Slack post about our new
  feature launch

Grok Bot: Here's a draft for Slack:
  "We just shipped something big..."
  Want me to add media and schedule it?

Create Your Post

Send a message to your Slack channel with the channel ID in settings. Schedule it for later or post immediately.

Example conversation

> Yes — add screenshot.png and schedule
  it for tomorrow at 9am

Grok Bot: Done! Scheduled on Slack for
  tomorrow at 9:00 AM.

Slack Settings Reference

Mention any of these in plain language and Grok Bot sets them for you. These are the Slack options it can apply to any post.

Field	Type	Required	Description
`__type`	string	Yes	Must be "slack"
`channel`	string	Yes	Slack channel ID (e.g. C12345)

Common Slack configurations

Ask Grok Bot for any of these common Slack posting scenarios and it applies the matching settings.

General Channel Announcement

Just ask

> Post it with: General Channel Announcement

Grok Bot: Got it. Applying:
  channel: C12345

Engineering Updates

Just ask

> Post it with: Engineering Updates

Grok Bot: Got it. Applying:
  channel: C67890

Marketing Channel Post

Just ask

> Post it with: Marketing Channel Post

Grok Bot: Got it. Applying:
  channel: CABCDE

What is Grok Bot?

Grok Bot is the always-on AI teammate product from xAI and Cursor. You create named Bots, give each one a job, and they work 24/7 on their own persistent cloud computer — with a browser, a filesystem, and a terminal — pinging you only when they need approval.

Grok Bot is not the Grok chatbot. Grok is the assistant you chat with on X and grok.com. Grok Bot is a separate app for delegating real, multi-step work — like running your Slack presence with Postiz.

💻

Own Cloud Computer

Every Bot gets a persistent cloud machine with a terminal. Postiz runs there, so your Slack posts go out even when your laptop is closed.

🔁

Routines

Turn any task into a routine that runs on a schedule. Your Bot drafts, schedules, and reports on Slack content without being asked twice.

🛡️

Approvals Built In

Bots ask before changing external systems. Review the Slack posts your Bot prepared in Postiz, approve, and it publishes.

How Postiz Works with Grok Bot

Postiz is listed on the Grok Bot plugin marketplace. Add it to a Bot and the Postiz skill, CLI, and command reference are installed on its cloud computer — the Bot can then manage your Slack workflow on its own.

✓Type /add-plugin postiz in a Bot chat, or add it from the Plugins sidebar
✓Store your POSTIZ_API_KEY as a Bot secret when prompted
✓The Bot reads the bundled SKILL.md and learns every Postiz command
✓Works in every Bot on your shared workspace, on desktop and iPhone
✓Approvals keep a human in the loop before anything is published

Grok Bot

# 1. Add the plugin to your Bot
/add-plugin postiz

# 2. Store your Postiz API key
#    as a secret when prompted

# 3. Ask your Bot to verify
You: Find my Slack channel in Postiz

Bot: Running postiz integrations:list
  Found your Slack integration.
  All Postiz commands are ready.

How Grok Bot runs Slack on a routine

Your Bot reads the Postiz skill, discovers your Slack integration, and handles the entire posting workflow — from content creation to scheduling — on its own cloud computer.

🧠

Message Your Bot

Desktop, iPhone, or a group chat

Send a message to your Bot from the desktop app or your iPhone. It runs on its own cloud computer, so it picks up your message, discovers your Slack account via Postiz, uploads your media, and schedules the post — then asks you to approve before it goes live.

Grok Bot

You: Post to Slack about our new
  feature launch, schedule for tomorrow
  at 9am

Bot: Got it! Here's the plan:
  1. Find your Slack integration
  2. Compose your post content
  3. Schedule for tomorrow 9:00 AM

  Done! Post scheduled successfully.
  Post ID: abc-123

🧠

Routines

Recurring work on a schedule

Save the task as a routine. Your Bot runs it on a schedule from the cloud, checks for new content, and posts it to Slack automatically — no manual trigger needed.

Grok Bot routine

Routine: daily-slack-posts
Schedule: Weekdays at 9:00 AM

Instructions:
  Check ~/content/posts on your cloud
  computer for new .txt files. For
  each one, read the content and
  schedule a post to Slack for
  today at noon via Postiz. Move
  posted files to ~/content/published
  and send me a summary.

Why Grok Bot + Postiz for Slack

Grok Bot makes Postiz a natural fit for your Slack workflow. The Bot reads the plugin's skill, chains the right commands together, and keeps running from the cloud.

✓Official plugin — one command install from the marketplace
✓Always on — posts to Slack from the cloud while you are away
✓Terminal access runs Postiz commands directly on the Bot's computer
✓Routines for hands-free daily posting
✓Cross-post to Slack + other platforms in a single conversation
✓Approvals keep a human in the loop before publishing

SKILL.md (bundled in the plugin)

---
name: postiz
description: Social media automation
  CLI for scheduling posts across
  30+ platforms including Slack
metadata:
  grok-bot:
    plugin: postiz
    secrets:
      - POSTIZ_API_KEY
    binaries:
      - postiz
---

# Available Commands
- postiz integrations:list
- postiz integrations:settings <id>
- postiz posts:create
- postiz upload <file>
- postiz analytics:platform <id>

# Slack Settings
channel (required)

Also Works with Claude Code

Postiz works with any AI agent that can run commands or call MCP tools — you ask, the agent does the work. That includes Anthropic's Claude Code. See the Claude Code guide for Slack, the guide for any AI agent, or connect over the Postiz MCP server.

Claude Code

by Anthropic

Claude reads the Postiz skill so it knows what it can do, then autonomously discovers your Slack integration, identifies the correct channel, and sends your message.

Claude Code

> Post a deployment update to #engineering
  on Slack

Claude: Done! Scheduled on Slack for
  tomorrow at 9:00 AM.

Cross-post Slack content to other platforms

Post the same announcement to Slack and other platforms in a single request. Each platform gets its own settings.

Example

> Post "Excited to announce our new feature!" to
  Slack and LinkedIn tomorrow at 9am, then schedule
  a daily tip on Slack every weekday at 10am

Grok Bot: Done! Scheduled:
  - Slack + LinkedIn: tomorrow 9:00 AM
  - Daily tips on Slack: Mon-Fri 10:00 AM

Example prompts for Slack in Grok Bot

These are prompts you can paste into a Bot chat. Grok Bot maps each one to the matching Postiz commands and Slack settings, then asks for approval.

Announcement

Grok Bot chat

> Post a launch announcement to #general on
  Slack at 9am tomorrow based on
  ./launch/summary.md

Grok Bot: channel: C0123ABC resolved.
  Scheduled tomorrow 9:00 AM. Approve?

Share a chart

Grok Bot chat

> Share ~/reports/weekly-growth.png in
  #marketing with the three key numbers

Grok Bot: Uploaded weekly-growth.png via
  Postiz. Draft ready.

Daily routine

Grok Bot chat

> Every weekday at 8:30am, post yesterday's
  Postiz analytics summary to #social

Grok Bot: Routine saved: daily-slack-analytics.

Slack rules Grok Bot follows

Grok Bot reads the Slack rules from postiz integrations:settings before scheduling. These are the ones that most often change what gets published.

✓channel is required and must be the Slack channel ID (for example C12345), not the display name. Grok Bot resolves it with postiz integrations:settings.
✓The Postiz Slack app must be added to the workspace and invited to private channels before it can post there.
✓Images and files must be uploaded through postiz upload first.
✓Slack renders basic formatting; ask the Bot for short paragraphs and bullet points rather than long walls of text.

Grok Bot and Slack: frequently asked questions

How do I post to Slack from Grok Bot?

Add the Postiz plugin with /add-plugin postiz and store your POSTIZ_API_KEY as a Bot secret. Name the Slack channel and the message. The Bot resolves the channel ID with postiz integrations:settings, drafts the message, and schedules it through Postiz. You approve before it posts.

Does Grok Bot need the Slack channel ID?

Yes, Postiz expects the channel ID such as C12345. You do not have to look it up: say the channel name and Grok Bot fetches the available channels from Postiz and maps the name to its ID. If the Postiz app is not in the channel yet, invite it first.

Can Grok Bot share images or reports in Slack?

Yes. Point the Bot at an image or file on its cloud computer. It uploads the file through postiz upload and attaches it to the message. This is useful for weekly charts or screenshots. Raw paths and external URLs are not accepted by Postiz.

Can Grok Bot post a daily summary to Slack automatically?

Yes. Save a routine such as "every weekday at 8:30am, post yesterday's analytics to #social". The Bot pulls the numbers with postiz analytics, writes a short summary, and schedules it through Postiz. Approvals keep a human in the loop before it posts.

Why use Postiz for Slack when Grok Bot can message Slack directly?

Postiz gives you one scheduling queue, one calendar, and one approval flow across Slack and 30+ other channels. Grok Bot can announce a release in Slack, Discord, and X in a single request, and everything appears in your Postiz calendar for review.

Related Grok Bot guides

Start at the Grok Bot social media plugin overview for setup, routines, and the full platform list, or read what Postiz supports on the Slack channel page.

Grok Bot for Discord→Grok Bot for Telegram→Grok Bot for X (Twitter)→Grok Bot for LinkedIn→Grok Bot for Listmonk→

Not using Grok Bot? Postiz works with any AI agent, including over the Postiz MCP server. See pricing for the free trial and plan limits.

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