Automate Slack with Claude Code

Send channel messages, schedule announcements, share media, and streamline team communications — just by asking Claude Code.

Setup Guide GitHub

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

Post to Slack in Seconds

Setup, then just ask

# One-time setup
npx skills add gitroomhq/postiz-agent
export POSTIZ_API_KEY=your_api_key

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

Claude Code: Done! Your Slack post is scheduled.

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 It Works

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

Find Your Slack Integration

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

Example conversation

> Is my Slack account connected to Postiz?

Claude Code: 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

Claude Code: 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

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

Slack Settings Reference

Mention any of these in plain language and Claude Code 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 Claude Code for any of these common Slack scenarios and it applies the matching settings.

General Channel Announcement

Just ask

> Post it with: General Channel Announcement

Claude Code: Got it. Applying:
  channel: C12345

Engineering Updates

Just ask

> Post it with: Engineering Updates

Claude Code: Got it. Applying:
  channel: C67890

Marketing Channel Post

Just ask

> Post it with: Marketing Channel Post

Claude Code: Got it. Applying:
  channel: CABCDE

What is Claude Code?

Claude Code is Anthropic's agentic coding tool that lives in your terminal. It handles software engineering tasks — writing features, fixing bugs, and answering questions about your codebase — and it can run shell commands and MCP tools like Postiz.

💻

Terminal & IDE Native

Claude Code runs in your terminal, with extensions for VS Code and JetBrains. You type what you want in plain English and it handles Postiz for you.

🔧

Agentic Execution

Claude Code plans and works through multi-step tasks on its own — discovering channels, uploading media, and scheduling posts — and asks for permission before it acts.

⚡

Parallel Tasks

Run several Claude Code sessions side by side, or spawn subagents in one. Schedule posts to different platforms while it handles other coding work.

How Postiz Works with Claude Code

Claude Code discovers Postiz through the Postiz skill or the Postiz MCP server. It reads the SKILL.md (or the MCP tool list) to learn what it can do, then chains calls together for social media workflows.

✓Install the Postiz skill, or add the Postiz MCP server with claude mcp add
✓Claude Code reads the SKILL.md and learns all Postiz commands
✓POSTIZ_API_KEY must be set in environment
✓Claude Code asks for permission before running commands
✓Works alongside your coding tasks in parallel

Install Postiz

# Option A: add the Postiz MCP server
claude mcp add --transport http postiz https://mcp.postiz.com/mcp-oauth-dynamic

# Option B: install the Postiz skill
npx skills add gitroomhq/postiz-agent
export POSTIZ_API_KEY=your_api_key

# Then just ask
claude "list my social media integrations"

Slack Posting with Claude Code

Tell Claude Code what to post from your terminal or IDE — it discovers your integrations via Postiz and handles the entire publishing workflow.

💻

Just Ask Claude Code

Terminal and IDE integration

Tell Claude Code what to post from your terminal or IDE — it discovers your integrations via Postiz and handles the entire publishing workflow.

Claude Code CLI

$ claude "Post to Slack about our
  new feature launch, schedule for
  tomorrow at 9am"

Claude Code: I'll handle that.
  Found your Slack integration.
  Composing and scheduling the post.

  Done! Your post is scheduled.
  Post ID: abc-123

💻

Parallel Tasks

Multiple tasks at once

Claude Code runs headless with claude -p, so several tasks can run in parallel. Schedule posts to different platforms while it works on other coding tasks.

Claude Code Parallel Tasks

# Run multiple posting tasks in parallel
$ claude -p "Schedule a post about our
  launch to X for tomorrow 9am" &

$ claude -p "Write a LinkedIn article
  about our new feature and schedule
  for tomorrow noon" &

$ claude -p "Fix the bug in auth.ts"

# All three tasks run simultaneously

Why Claude Code + Postiz for Slack

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

✓Runs in your terminal or IDE — just type what you want
✓Permission-based execution — you stay in control
✓Parallel task support — post while coding
✓Channel targeting applied automatically based on your instructions
✓Cross-post to Slack + other platforms in a single session
✓Powered by Claude — Anthropic's most capable models

SKILL.md (auto-discovered)

---
name: postiz
description: Social media automation
  CLI for scheduling posts across
  30+ platforms including Slack
metadata:
  claude-code:
    requirements:
      env:
        - 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 Cowork

Postiz works with any AI agent that can run commands or call MCP tools — you ask, the agent does the work. That includes Claude Cowork, Anthropic's desktop agent — no terminal needed.

Claude Cowork

by Anthropic

Claude Cowork 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 Cowork

> Post a deployment update to #engineering
  on Slack

Claude Cowork: 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

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

Start posting to Slack

Install Postiz Agent and automate your Slack communications with AI-powered scheduling and messaging.

Get Started

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