AI can generate NinjaScript quickly, but the first version of a strategy or indicator will not always compile successfully. What matters is having a reliable way to find the problem, repair the code and check it again before deploying it to NinjaTrader. In this tutorial, we use Xen AI for NinjaTrader to build a SuperTrend strategy, detect a NinjaScript error with Build Check, switch AI models for debugging and repair the project.
Watch Xen Find and Fix a NinjaScript Error
The demonstration starts by creating a SuperTrend strategy with a lower-cost AI model. After the strategy is generated, Xen runs Build Check and identifies an error in the NinjaScript source.
Watch the NinjaTrader AI code repair tutorial on YouTube
Find NinjaScript Errors with Build Check
In this example, the initial SuperTrend strategy is generated with DeepSeek as a lower-cost option for the first build. Once the source code has been created, Xen runs Build Check against the NinjaTrader development environment rather than assuming the generated project is ready to use.
Build Check identifies compiler problems in the generated NinjaScript and provides the error information needed to investigate them. This is useful with AI-generated code because a relatively small problem with an API call, class name, namespace or NinjaScript lifecycle method can prevent an otherwise valid strategy from compiling.
Switch AI Models to Repair the Code
A Xen project is not tied to the AI model that originally generated the code. In the video, we switch from DeepSeek to GPT Luna after the build error is found. Luna receives the existing project context and repairs the problem without recreating the strategy from the beginning.
This also makes it possible to choose models according to the task and cost. A lower-cost model can handle straightforward code generation, while another model can be selected when a compiler error, difficult modification or more complex NinjaScript problem needs additional attention.
Check and Test the Repaired Strategy
After a repair, the project should be checked again. Asking an AI model to fix an error is not enough on its own; the updated source needs to compile successfully before the strategy is deployed to NinjaTrader.
A successful build only confirms that the NinjaScript is technically valid. It does not confirm that the trading logic is correct or that the strategy will perform as expected. The repaired strategy should still be reviewed, backtested with NinjaTrader Strategy Analyzer and tested in simulation before live use.
Continue Debugging in the Same Xen Project
Xen AI for NinjaTrader supports more than generating NinjaScript from a prompt. The same project can be used to modify the code, run Build Check, repair errors, switch AI models and continue development without starting again each time a problem is found.
This creates a practical development cycle: generate or modify the NinjaScript, check the build, repair any errors, validate the result and then move on to testing in NinjaTrader.
