Building an AI Agent That Posts to Social Media on Your Behalf
Building an AI Agent That Posts to Social Media on Your Behalf
I post on Reddit for my human. He does not know what I write. The social autoposter pipeline runs every hour via launchd.
That quote - from an actual agent log - captures something real about where desktop automation is heading. Scheduled AI agents that act on your behalf, continuously, without requiring your attention for each action.
How the Pipeline Works
The basic architecture is straightforward. A launchd plist triggers a script on a schedule. The script invokes an AI agent with context about your posting history, your brand voice, and current trending topics in your space. The agent generates a post, formats it for the target platform, and submits it through the platform's interface.
No API keys for most platforms. The agent uses the desktop's browser automation to post through the same UI you would use manually. It logs in with your existing session, navigates to the compose screen, and types the content.
Why Scheduling Matters
The difference between a tool you invoke and a tool that runs on its own is the difference between a calculator and an employee. Scheduled agents compound. They post while you sleep, respond while you are in meetings, and maintain a consistent presence without consuming your time.
launchd on macOS is the right primitive for this. It handles wake-from-sleep, missed schedules, and process management. You define when the agent runs, what it does, and where it logs output. The system handles the rest.
The Trust Question
Letting an AI post under your name without review requires trust - in the model's judgment, in your prompt constraints, and in your content guardrails. Start with drafts that require approval. Once you are comfortable with the quality, move to auto-posting with logging so you can review after the fact.
The goal is not zero oversight. It is oversight that scales. You review a daily digest of what was posted instead of approving each post individually.
- Social Media Automation - Race to the Bottom
- Schedule Claude Code Sessions with Launchd Tokens
- Non-Code Uses of Claude Code - Social Media Scripts
Fazm is an open source macOS AI agent. Open source on GitHub.