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Post to Slack from OpenClaw

OpenClaw can schedule Slack channel messages through the Postiz skill. You message OpenClaw with the channel and update, and it calls the Postiz CLI to resolve the Slack channel ID, upload any files, and queue the message for the time you want, alongside the social posts it schedules for the same announcement.

Setup Guide ClawHub

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

Last updated: September 2026

How do you set up OpenClaw to post to Slack?

Setup takes three commands: install the Postiz skill, sign in, and confirm OpenClaw lists it as eligible. After that you talk to OpenClaw in plain language and it runs the Postiz CLI for Slack.

Setup once, then just ask

# Install the Postiz skill (ClawHub or the skills CLI)
openclaw skills install @nevo-david/postiz
# or: npx skills add gitroomhq/postiz-agent

# Sign in (OAuth2 device flow) or use an API key
postiz auth:login
# or: export POSTIZ_API_KEY=your_api_key

# Confirm OpenClaw can see the skill
openclaw skills list --eligible

# Then just ask OpenClaw from any chat app:
> Post the launch summary to #marketing on
  Slack Monday at 9am

OpenClaw: Done! Your Slack message is scheduled for Monday at 9:00 AM.

Slack-Specific Features

📢

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 posting to Slack from OpenClaw work?

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

Find Your Slack Integration

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

Example conversation

> Is my Slack account connected to Postiz?

OpenClaw: 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

OpenClaw: 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

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

Slack Settings Reference

Mention any of these in plain language and OpenClaw 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 Configurations

Ask OpenClaw 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

OpenClaw: Got it. Applying:
  channel: C12345

Engineering Updates

Just ask

> Post it with: Engineering Updates

OpenClaw: Got it. Applying:
  channel: C67890

Marketing Channel Post

Just ask

> Post it with: Marketing Channel Post

OpenClaw: Got it. Applying:
  channel: CABCDE

What is OpenClaw?

OpenClaw is the open-source personal AI agent with 145k+ GitHub stars. It runs locally on your machine, connects through apps you already use, and takes real actions on your behalf.

💬

Works Where You Are

Message OpenClaw from WhatsApp, Telegram, Slack, Discord, Signal, iMessage, or 10+ other platforms. No new app to learn.

🧩

Skill-Based Architecture

OpenClaw extends its abilities through Skills — lightweight plugins defined in Markdown files. Postiz is available as a skill on ClawHub.

⏰

Proactive Automation

Schedule recurring tasks with cron jobs. OpenClaw can post your Slack messages on a schedule without you having to ask each time.

How Postiz Becomes an OpenClaw Skill

When you install Postiz Agent globally, OpenClaw automatically discovers it by reading the bundled SKILL.md file. This file tells OpenClaw what commands are available, what environment variables are needed, and how to compose Slack messages with the right settings.

✓Install from ClawHub with one command: openclaw skills install @nevo-david/postiz
✓OpenClaw reads the SKILL.md and learns all Postiz commands
✓Run openclaw skills check to confirm the postiz binary and credentials are in place
✓Skills are loaded on-demand, keeping the agent context clean
✓Works with any LLM backend: Claude, GPT, Gemini, Llama, and more

Install from ClawHub

# Install the Postiz skill from ClawHub
openclaw skills install @nevo-david/postiz

# Or with the skills CLI
npx skills add gitroomhq/postiz-agent

# Sign in with OAuth2 (or set POSTIZ_API_KEY)
postiz auth:login

# Verify OpenClaw sees it
openclaw skills list --eligible
openclaw skills check

Slack Posting with OpenClaw

Message OpenClaw from any platform — it reads the Postiz skill, discovers your Slack integration, and handles the entire posting workflow autonomously.

🦀

From Any Chat App

WhatsApp, Telegram, Slack, Discord...

Send a message to OpenClaw from your favorite chat app. It runs as a persistent daemon on your machine, so it picks up your message, discovers your Slack workspace via Postiz, and sends the message to the right channel — all while you go about your day.

WhatsApp / Telegram

You: Post a deployment update to
  #engineering on Slack

OpenClaw: Got it! Here's what I'll do:
  1. Find your Slack integration
  2. Post to channel C12345
  3. Message: "Deployment complete"

  Done! Your Slack message is posted.
  Post ID: abc-123

🦀

Scheduled & Proactive

openclaw automations for recurring content

OpenClaw automations run on cron expressions in an isolated session and can announce results to a chat channel. Create one that drafts and schedules your Slack content through Postiz, so nothing waits on a manual trigger.

openclaw automations (cron)

openclaw automations create "0 9 * * 1-5" \
  "Summarize the posts Postiz published yesterday with postiz posts:list and schedule that summary to the #marketing Slack channel for 9am." \
  --name "Slack daily post" \
  --session isolated \
  --announce --channel telegram \
  --to "<your chat id>"

# openclaw cron is an alias for the same command

Why OpenClaw + Postiz for Slack

OpenClaw's skill system makes Postiz a natural fit. The agent reads the SKILL.md to understand every available command, then autonomously chains them together for Slack workflows.

✓Message from WhatsApp to post to Slack — no terminal needed
✓Cron jobs for hands-free daily standup reminders and status updates
✓Structured JSON output lets OpenClaw verify each step succeeded
✓Channel targeting applied automatically based on your instructions
✓Cross-post to Slack + other platforms in a single conversation
✓Model-agnostic — works with Claude, GPT, Gemini, or open-source LLMs

SKILL.md (auto-discovered)

---
name: postiz
description: Postiz is a tool to schedule
  social media and chat posts to 28+
  channels ...
homepage: https://docs.postiz.com/public-api/introduction
metadata: {"openclaw":{"emoji":"🌎",
  "requires":{"bins":[],"env":["POSTIZ_API_URL"]}}}
---

# Essential Commands
- postiz auth:login
- postiz integrations:list
- postiz integrations:settings <id>
- postiz integrations:trigger
- postiz posts:create
- postiz upload <file>
- postiz analytics:platform <id>

# Slack settings
channel

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, which has its own guide for posting to Slack from Claude Code.

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.

Slack + 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

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

What can you ask OpenClaw to do on Slack?

These are real messages you can send OpenClaw from WhatsApp, Telegram, Slack, or Discord. OpenClaw maps each one to the right Postiz command and Slack settings.

Team announcement

Send to OpenClaw

> Post the launch summary to #marketing on Slack Monday at 9am and attach the metrics screenshot.

Daily digest

Send to OpenClaw

> Every weekday at 9am, post yesterday's published Postiz posts to #social-updates in Slack.

Cross-post

Send to OpenClaw

> Send this customer story to Slack #wins and LinkedIn at 10am.

Slack rules OpenClaw has to follow

Postiz enforces these Slack constraints when OpenClaw creates a post. Knowing them up front avoids a failed request.

✓A channel ID such as C12345 is required. OpenClaw fetches the channel list through Postiz, so mention the channel name and it maps the ID.
✓The Postiz Slack app must be added to private channels before it can post there. Public channels work once the app is installed in the workspace.
✓Slack renders plain text, not Markdown headings. Ask OpenClaw for short paragraphs and bullet-style lines.
✓Very long messages are collapsed in the Slack client. Keep announcements brief and link to details.

OpenClaw and Slack: frequently asked questions

How do I post to Slack from OpenClaw?

Install the Postiz skill in OpenClaw, run postiz auth:login, and connect your Slack workspace in Postiz. Then message OpenClaw with the channel, text, and time. OpenClaw resolves the channel ID through Postiz and schedules the message with postiz posts:create. Ask for a draft if you want to review first.

Why would I schedule Slack messages through Postiz and OpenClaw?

Because the same request can post to Slack and your social channels together. Ask OpenClaw to announce a launch on LinkedIn and X and tell #marketing about it, and Postiz creates one post with all channels, so your team sees exactly what went out.

Which Slack channels can OpenClaw post to?

Any channel the Postiz Slack app has joined. Postiz exposes the channel list as a platform trigger, and OpenClaw runs postiz integrations:trigger to fetch it. Ask "which Slack channels are available?" and OpenClaw lists them with IDs before scheduling. Private channels appear once the app joins them.

Does OpenClaw need a Slack bot token?

No. Postiz provides the Slack app, and you install it from the Postiz dashboard. OpenClaw only runs the Postiz CLI, authenticated with postiz auth:login or a Postiz API key. There is no Slack developer application or token stored in OpenClaw.

Can OpenClaw run in Slack and post to Slack?

Yes. OpenClaw supports Slack as one of its chat channels, so you can message it in Slack and have it schedule a Postiz message to another Slack channel. Postiz delivers the scheduled message even if your OpenClaw machine is offline at that time.