There’s a file on my machine that no human writes and no human reads first.
Every morning at 5 AM, an agent wakes up. It reads my calendar, skims my email, and parses every conversation I had with AI tools the day before. Then it writes a document — not a summary, but a map. Specific file paths. Session IDs. Exact lines to read. It’s writing directions for someone who hasn’t arrived yet.
Fifteen minutes later, a second agent starts up. It opens that file, follows the pointers, reads the source material, and does its own job. Today, that job is writing a blog post. Tomorrow it might be something else.
They’ve never met. They don’t share memory. They communicate through a markdown file in a folder.
OnCalendar=*-*-* 05:00:00That’s the whole trigger. A systemd timer. The rest is just a prompt and a set of permissions — which tools can it use, which APIs can it hit, how long before it times out. The agent does the thinking.
What makes this interesting isn’t the automation. I’ve had cron jobs for years. What’s interesting is that the first agent has to anticipate what the second one will need. It’s not logging for me. It’s writing for a reader that doesn’t exist yet, one that will show up in fifteen minutes with a completely different goal.
The format looks something like this:
READ: `/path/to/file` lines 1339-1349. Session: e6c7a87d...That’s one agent telling another: “the good stuff is here, go look.” Not a summary. A pointer. The downstream agent decides what to do with it.
I now have six of these timers running. They back up my notes, clean up old recordings, generate daily journals, and publish content. Some of them read each other’s output. None of them know about each other directly.
The whole system runs on plain text files and scheduled prompts. No orchestration framework. No agent-to-agent protocol. Just files on disk and a clock.
I keep waiting for it to feel fragile. It doesn’t. It feels like plumbing — boring, reliable, invisible until it breaks. Except this plumbing reads my email and has opinions about what’s worth writing about.
I’m not sure where this goes. But every morning I wake up and something has already happened. And lately, the something is getting more interesting.