[bug] Small changes break the code

[gabrielevaudano98]

Describe the bug
When requesting small modifications to a specific component within a file—such as updating the title, changing the background color, or adjusting styles—the AI engine tends to rewrite the entire code block. This often disrupts previously established dependencies, leading to changes in behavior, appearance, and potentially introducing errors. As a result, the application may malfunction, sometimes requiring a rollback to a previous stable version.

To Reproduce

1. Have a project with a medium code base (>50k tokens)
2. Ask to edit a specific part. Better if you use the cursor selection for the area to edit, that will bring even more problems.
3. Wait for the result.

Expected behavior
The AI engine should apply only the requested changes in a minimal and targeted way, preserving the existing structure, logic, and dependencies of the component. Instead of rewriting entire blocks of code, it should update only the relevant lines—such as modifying a property, class, or style—while maintaining the integrity and functionality of the surrounding code. This ensures consistency in behavior, reduces the risk of introducing bugs, and avoids the need for rollbacks or manual corrections.

Desktop (please complete the following information):

• OS: Windows 11 Pro
• Browser Chrome, Firefox, Edge
• Version 0.14.0 stable

Additional context
A possible workaround is to copy the specific code block from the original file and paste it into the prompt when requesting changes—clearly instructing the AI to make minimal edits and preserve the existing structure. This approach can sometimes reduce the risk of unintended disruptions, as the AI is more likely to focus only on the provided code. However, this method is not foolproof and may still result in broader modifications than intended.

[wwwillchen]

This is supported in https://www.dyad.sh/docs/guides/ai-models/pro-modes#turbo-edits (because Turbo Edits uses a specialized model, it requires Dyad Pro)

[gabrielevaudano98]

@wwwillchen Do you think adding the possibility of editing existing code (rather than rewriting an entire page from scratch) could be feasible in the near future using open-source, free, and widely available tools, without relying on specialized models?

Right now, having to regenerate full pages every time is inefficient to me and the AI model. It often leads to loss of time, and worse, hallucinations or inconsistencies in the regenerated code compared to the original.

Tho, I completely understand the business strategy behind the current model, but, it would be great to have a more flexible option, perhaps a mid-tier subscription (e.g., $15/month) that allows access to these editing functionalities, even if limited to API usage, without tying them to token-based pricing.

I believe many users would be willing to pay for such an intermediate solution. Also, I believe a "big spender" is already likely to purchase full AI credits, while a "low spender" could benefit from more affordable, focused plans, ultimately broadening your customer base.