Codex to maintain a Korea trip AI brain

Yuta used a first overseas trip to Korea to try a travel workflow built around local files. Before leaving, Codex organized an AI brain containing an index, goals, current status, next actions, open questions, entities, outputs, logs, attachments and raw material. It also produced a PDF guide that could be consulted from a phone.

Those files gave later questions a place to start. Instead of rebuilding the trip context in each conversation, the author could update the recorded plan and ask about the next decision. During the completed trip, the workflow supported T-money balance and top-up calculations. When Yuta was tired, a direct request for a slower day changed the plan.

Codex handled the structured preparation and records, while ChatGPT supported questions and image interpretation on location. The author deliberately kept all payments and final choices with the human traveller. This was a context and planning system, rather than an account of autonomous ticket buying.

The experiment also exposed omissions. Plug compatibility and toilet customs had not been covered well enough before departure, and hotel staff supplied missing practical information. A reusable version would keep unresolved questions visible alongside the itinerary. The source's useful contribution is its file structure and continuing updates, with the completed journey showing where local human help still mattered.

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Source: note.com · ゆーた (@yuta_mizukami)