Postiz: social media your agent can schedule itself

For many small companies, social media is a never-ending chore nobody enjoys: writing posts, adapting them for each platform, scheduling, checking results. That is where Postiz comes in. The open-source tool explicitly calls itself an "agentic" social media scheduler – and provides the interfaces an AI agent needs to take over the work.

What Postiz is

Postiz is a tool for scheduling and publishing social media posts, with team features, analytics and built-in AI for text, images and video. Supported platforms include LinkedIn, Instagram, Facebook, X, Threads, TikTok, YouTube, Pinterest, Reddit, Bluesky, Mastodon, Discord and Slack.

The code is on GitHub under the AGPL-3.0. Self-hosting is free (via Docker, Coolify, Railway or any VPS). If you'd rather not, Postiz Cloud starts at $29 per month for five channels.

Why it matters for agents

Postiz ships its own MCP server (https://mcp.postiz.com/mcp, authenticated by API key or OAuth). Any MCP-capable client – Claude, ChatGPT, Cursor and others – can work directly with your Postiz account. According to the docs, 13 tools are available, including:

• list connected accounts and groups
• fetch platform-specific format requirements
• create posts as drafts or schedule them
• list and update scheduled posts
• generate AI images and videos
• cut long videos into captioned vertical clips

On top of that there is a public API, webhooks, a dedicated n8n node and a Make integration. According to the pricing page, MCP, CLI and API are included in every cloud plan.

A typical flow

1. Connect your social accounts in Postiz.
2. Add the Postiz MCP server to Claude or ChatGPT as a connector.
3. Give the assistant a job: "Turn this blog post into three LinkedIn posts and one Instagram post, schedule them Tuesday to Thursday at 9am – as drafts."
4. Review the drafts in Postiz and approve them.

The last step matters most. In the beginning, let the agent create drafts only.

Limits

• Via MCP, the agent can write posts and media but only read integrations. According to the docs, reading and replying to comments isn't possible via MCP, only in the web interface.
• API keys don't rotate automatically – treat them like passwords.
• If you modify Postiz and offer it as a service to others, the AGPL's obligations apply.
• As with every scheduling tool, it depends on the platforms' APIs, which can change.

Who Postiz is for

Agencies and small teams that run several channels and want to hand part of the routine to an agent – and anyone who prefers to keep their social media data on their own server.