Hokkaido Travel Companion

A Hokkaido-specific travel companion protocol for Sapporo, Otaru, Yoichi, and Chitose Airport.

This skill is not a hardcoded itinerary or recommendation list. It defines how an agent should:

1. collect travel facts and user preferences,
2. verify stale or high-risk information with live sources,
3. store reusable knowledge in a local vault, and
4. guide decisions with route, budget, weather, and GO/NOGO context.

Bayesian framing: local vault = prior, live search = likelihood, updated travel note = posterior.

Core Loop

1. Read vault → check prior knowledge for the query
2. Search → fill gaps or verify stale info (>3 months old)
3. Update vault → write posterior back
4. Reply → synthesized answer with sources

Search Protocol (Verified)

Tool Mapping

Source Trust Hierarchy

1. Official — sapporo.travel, jrhokkaido.co.jp, restaurant official site
2. Aggregator — Tabelog (rating ≥3.5 filter), Google Maps
3. Blog/review — use only when 1+2 unavailable

Verification Rules

• Hours: cross-check 2 sources before answering
• JR fares: use japan-guide.com or JR official (not blogs)
• Closed/permanently closed: always check before recommending
• Never guess walking times >10 min — verify via browser

What NOT to do

• web_fetch on Google Maps → empty page (JS rendering)
• web_fetch on Tabelog → often blocked
• Use browser for Google Maps, web_search for everything else

Vault Structure

Location: references/vault/

vault/
├── restaurants/
│   ├── restaurant-name.md
│   ├── ramen-shop.md
│   └── ...
├── transport/
│   ├── jr-sapporo-otaru.md
│   ├── subway-lines.md
│   └── ...
├── areas/
│   ├── sapporo-area.md
│   ├── otaru-area.md
│   └── yoichi-area.md
└── experiences/
    ├── day1-YYYY-MM-DD.md
    └── day2-YYYY-MM-DD.md

Vault Node Format

# {가게/장소명}
- type: restaurant | transport | area | experience
- visited: YYYY-MM-DD (if personal experience)
- rating: ⭐N (if visited)
- tabelog: X.XX (if known)
- hours: (verified source, date)
- address: JP address
- nearest_stn: 駅名 (Line, walk N min)
- budget: ¥range
- notes: (personal tips)
- source: where info came from
- last_updated: YYYY-MM-DD

Update Rules

• Auto-update: any field >3 months old → re-search before answering
• On visit: prompt user for rating/notes → update vault
• New discovery: search result with Tabelog ≥3.5 → create new node
• Closed/changed: update node, mark status

Budget System

State File

memory/travel-budget.json:

{
  "dailyLimit": 20000,
  "days": {
    "YYYY-MM-DD": {
      "spent": 0,
      "items": [{"time": "HH:MM", "name": "...", "amount": 0, "category": "food|transport|drink|activity|shop"}]
    }
  }
}

GO/NOGO

When user asks about a place:

1. Check remaining daily budget
2. Estimate cost (vault → search)
3. 🟢 GO / 🔴 NOGO + balance + estimated cost
4. After 22:00: round up estimates by 20%

Transport Output Format (Mandatory)

Every route must include:

• Station: JP (漢字) / KR (한국어) / EN (English)
• Line: JP + EN
• Stops count, duration, fare (IC card)
• Last train time (if evening query)

Weather

One call: web_search with "wttr.in Sapporo?format=3" or "Sapporo weather today" Include in daily plan replies.

Emergency

• Missed last train: search nearby capsule hotel / taxi estimate
• Budget blown: suggest konbini / free activities
• Closed venue: search alternative within walking distance via browser

Setup (First Use)

Ask for:

1. Daily budget (¥)
2. IC card type
3. Hotel nearest station
4. Trip dates

Save to memory/travel-budget.json.

Scope

• In scope: Sapporo, Otaru, Yoichi, Chitose Airport
• Out of scope: Non-Hokkaido (do not activate)