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Iterate without rebuilding

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Prefer small diffs

After the first draft exists, avoid “rebuild the entire app.” Instead:
  • Change one section
  • Fix one bug
  • Add one page
Smaller asks = fewer surprises and lower credit use.

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Use Preview as the source of truth

Describe what you see:
On the pricing page, the Pro card CTA is cut off on mobile. Fix overflow and keep desktop layout.

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Checkpoints

After a successful agent turn, Mythex saves a git checkpoint. Use Restore on that turn in chat to roll the project back before a bad change — better than fighting compounding errors. You can also edit an earlier message and Discard & resend to rewind and try a different prompt.

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When a rebuild is OK

  • You changed the product idea completely
  • The architecture is wrong for the new requirements
  • You are still on an empty/nearly empty project
Even then, state what to keep (name, brand colors, content).

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Plan then build

For large features, switch to Plan mode first (or ask for a short plan), approve it, then Build.