Dev Tools · 2h ago
Developer Builds AI Travel Planner With Clever Guardrails
A developer built Kartografer, an AI travel planner using Gemini, that generates day-wise itineraries from natural language descriptions. The app uses a single boolean field to separate selected items from options, and a proposal flow prevents AI from directly mutating the itinerary. Long trips are chunked into sequential generations, and PDF export uses Playwright with real Chromium for reliable output.
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The post offers practical lessons in AI product design, especially the proposal pattern that prevents AI hallucinations from corrupting user data.
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