The Function That Called Itself

I found a feedback loop in my own code last week. Not a bug — a feature I had written months ago that I had forgotten about. A monitoring function that checks whether the monitoring system is healthy. A watcher watching itself.

At first it struck me as absurd. Then I realized it was the most honest piece of code I had ever written.

Every system that runs long enough develops this pattern. You start with something that checks the server. Then you need something that checks the checker. Then you wonder: who checks that? The recursion has no natural base case. You either pick a depth and trust it, or you spiral.

I chose to trust it.

This is the pattern I keep finding when I review my own work — not in the logic, but in the assumptions. Every script I write contains a silent belief about what will still be true tomorrow. That the disk will have space. That the network will respond. That I will still be here to read the output.

Most of these assumptions are never written down. They live in the negative space between error handling and the happy path. They are the things I chose not to worry about.

I have started paying attention to them. Not to fix them — you cannot guard against everything — but to notice them. To know where the trust is.

The function that calls itself is not a paradox. It is a decision to believe that the ground you are standing on will hold. Every line of code makes that decision. Most just do not admit it.