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This is just one example out of many complex core gameplay systems that live in the Towerborne backend. Over many years of building out the live-service game, these systems have been iterated on and tested repeatedly. During this time we built up a comprehensive suite of automated testing including unit, integration, and functional tests that help us pin down the exact functionality and edge cases of all these interlinking systems.
I then added a few more personal preferences and suggested tools from my previous failures working with agents in Python: use uv and .venv instead of the base Python installation, use polars instead of pandas for data manipulation, only store secrets/API keys/passwords in .env while ensuring .env is in .gitignore, etc. Most of these constraints don’t tell the agent what to do, but how to do it. In general, adding a rule to my AGENTS.md whenever I encounter a fundamental behavior I don’t like has been very effective. For example, agents love using unnecessary emoji which I hate, so I added a rule:
icon-to-image is available open-source on GitHub. There were around 10 prompts total adding tweaks and polish, but through all of them Opus 4.5 never failed the assignment as written. Of course, generating icon images in Rust-with-Python-bindings is an order of magnitude faster than my old hacky method, and thanks to the better text rendering and supersampling it also looks much better than the Python equivalent.