Does a coding agent write better code when it knows how it will be checked?
Yes. It writes for the gates, not just for the prompt.
- Hypothesis
- A builder that knows which checks its work will face, and what earlier builds in the same codebase needed, produces code that passes those checks sooner and needs fewer repairs.
- Method
- Observations from our own builds across many repositories. We looked at how a change develops when the builder works from the spec alone, and when it starts with the gates ahead of it and with what earlier builds in the same repo taught it, such as conventions, test patterns and fixes that worked.
- Finding
- With the gates in view, the builder writes tests, error handling and access checks as part of the change instead of adding them after a red result. When it can see what worked in earlier builds of the same repo, its repairs tend to land in the first round rather than the second.
Give a capable coding agent a task and it will solve the task. That is exactly the problem. It optimises for the request in front of it: make the button work, make the test pass, finish.
What it does not see is everything that will happen to the code afterwards. Will a test written before the code expose a gap? Will a security assessment object to an unchecked input? Will an independent reviewer ask why a customer can open someone else’s record?
Writing for the gates
In the DayStorm Factory, the builder knows the road ahead. Tests are written first and have to fail before any code exists. After the build come unit, end-to-end and regression runs, a security assessment and a senior review by a separate AI reviewer. A builder that knows this writes differently. Error paths, access checks and tests stop being afterthoughts, because it knows they will be asked for.
Remembering the repo
The second difference is memory. A coding agent in a terminal mostly starts from what the person at the keyboard gives it. The Factory keeps what earlier builds in the same repo taught it: how this codebase names things, how its tests are written, which fixes worked when something went red. That knowledge goes into the next build, so the same lesson does not have to be learned twice.
In the Factory
Every build in the DayStorm Factory starts from a spec sharpened against your codebase, with the gates and the history of your repo in view. Your developers keep their coding agents for exploring. Changes that ship take the path where the checks are known from the start.