DeepSeek reviews its own itinerary and triggers one controlled regeneration when it finds a serious flaw.

Trips of 12+ days use a complete skeleton and seven-day detail chunks to avoid truncated JSON.

Country, city viewport, administrative area and place name are cross-checked to block same-name attractions in the wrong city.

Generated plans are kept in IndexedDB, preserving user history without adding a project database.

Nine Likert dimensions are converted into a deterministic Big Five profile, so identical inputs always receive a consistent interpretation.

Schedule clustering narrows the solution space, AI optimizes personality compatibility, then each room receives an explainable report.

If the AI service fails, the system preserves the deterministic schedule-based allocation instead of blocking the workflow.

Administrators can inspect floors, rooms and beds, review compatibility, and drag, swap or remove occupants manually.