Add day item

Page scope

add_day_item is registered ONLY on the Itinerary page (URL pattern /trips/<tripId>/itinerary). On every other page the tool is not in the registry and a call will silently fail.

If the user asks to add an itinerary item from a different page, reply: "Open the trip's Itinerary page; I can add items there." Do not retry under another name; do not invent a confirmation.

When to use

Call add_day_item when the user wants to add something to a specific day of the trip's itinerary AND you are on the Itinerary page. Typical phrasings:

• "add Eiffel Tower to day 2"
• "schedule lunch at Cantina at 1pm on Friday"
• "put the museum visit on day 3"
• "add a note: bring an umbrella"

Do NOT call for trip-level edits (title, dates, total budget) — those go through update_<state> actions auto-registered by usePilotState.

How to use

1. Identify the day. The user may say "day 2" or a date like "Friday". If a date, convert with compute_relative_date to a YYYY-MM-DD value, then look up which day index that matches in the trip state.
2. Call add_day_item({ dayIndex, kind, title, time?, location?, notes? }). kind is one of: activity, meal, transit, note.
3. The framework will pop a confirm modal (mutating). The user approves or cancels. Wait for the result.
4. After the user decides, acknowledge in one sentence:
   • approved → "Added Eiffel Tower to day 2."
   • cancelled → "Cancelled — nothing added."

Anti-patterns

• Do NOT add items in bulk without confirming each one. If the user says "add 5 things", do them one at a time.
• Do NOT guess the kind. If unclear, default to activity.
• Do NOT skip the date resolution step; "Friday" without conversion is a hallucination risk.