How I Run Two AI Coding Agents on One Codebase

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I have been building a fishing app for 58 days.

In that time the repository has taken 374 merged pull requests. I am one person. I did not write most of that code — two AI agents did, working from two different instruction files, in one repository, and a CI test keeps the two files honest with each other.

This post is about that setup: why I ended up with two agents instead of one, the specific way it broke, and the twenty lines of test code that stopped it breaking again.


1. The setup

The app is World Fishing Map. You photograph a fish, an AI identifies the species, you approve it, and the catch goes onto a world map. The interesting part is not the identification — it is that the app tries to verify the catches it records, using EXIF and GPS cross-checks, perceptual hashing...

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