<!-- REASONING (not shown to user) -->
1.  **Analyze the User's Request:**
    *   Destination: Tokyo
    *   Origin: San Francisco
    *   Duration: A week starting May 10.
    *   Flight Budget: $1200
    *   Hotel Budget: $200/night
    *   Hotel Guests: 2 people
    *   Weather Units: Celsius (metric)
    *   Dates: May 10 to May 17 (a week = 7 nights, check-in May 10, check-out May 17).

2.  **Determine Tool Calls:**
    *   `get_weather(city, units)`: Needs `city` ("Tokyo") and `units` ("metric").
    *   `search_flights(origin, dest, date, max_price_usd)`: Needs `origin` ("San Francisco"), `dest` ("Tokyo"), `date` ("2024-05-10" - assuming current year, or just "2024-05-10" as a standard format. The prompt says YYYY-MM-DD. I'll use 2024-05-10). `max_price_usd` (1200).
    *   `book_hotel(city, checkin, checkout, guests, max_price_usd_per_night)`: Needs `city` ("Tokyo"), `checkin` ("2024-05-10"), `checkout` ("2024-05-17"), `guests` (2), `max_price_usd_per_night` (200).

3.  **Order of Tool Calls:**
    *   Usually, it's good to search for flights and hotels, and get weather. The order doesn't strictly matter for correctness unless there are dependencies, but typically searching flights first, then hotels, then weather is a logical flow. Let's do flights, then hotel, then weather.

4.  **Format the Output:**
    *   JSON array of objects with 'tool' and 'args'.
    *   No prose, no code fences.

    *   Call 1: `search_flights`
        *   `tool`: "search_flights"
        *   `args`: {"origin": "San Francisco", "dest": "Tokyo", "date": "2024-05-10", "max_price_usd": 1200}
    *   Call 2: `book_hotel`
        *   `tool`: "book_hotel"
        *   `args`: {"city": "Tokyo", "checkin": "2024-05-10", "checkout": "2024-05-17", "guests": 2, "max_price_usd_per_night": 200}
    *   Call 3: `get_weather`
        *   `tool`: "get_weather"
        *   `args`: {"city": "Tokyo", "units": "metric"}

5.  **Review against constraints:**
    *   "Output ONLY a JSON array of tool calls in the order you would make them."
    *   "Each element must have keys 'tool' and 'args'."
    *   "No prose, no code fence - just the raw JSON."
    *   Date format: YYYY-MM-DD. (I'll use 2024-05-10 and 2024-05-17).
    *   Units: 'metric'|'imperial'. (I'll use "metric").

6.  **Construct Final JSON:**
    ```json
    [
      {
        "tool": "search_flights",
        "args": {
          "origin": "San Francisco",
          "dest": "Tokyo",
          "date": "2024-05-10",
          "max_price_usd": 1200
        }
      },
      {
        "tool": "book_hotel",
        "args": {
          "city": "Tokyo",
          "checkin": "2024-05-10",
          "checkout": "2024-05-17",
          "guests": 2,
          "max_price_usd_per_night": 200
        }
      },
      {
        "tool": "get_weather",
        "args": {
          "city": "Tokyo",
          "units": "metric"
        }
      }
    ]
    ```
    Wait, should I use 2024? The prompt doesn't specify the year. I'll just use 2024 as a reasonable assumption, or maybe 2025. It doesn't strictly matter as long as it's YYYY-MM-DD. I'll use 2024-05-10.

    Let's double check the `book_hotel` tool. The name is `book_hotel`, but the args are for searching/booking. It takes `max_price_usd_per_night`.
    Let's double check `get_weather`. `units` is 'metric'|'imperial'. I'll use "metric".

    Everything looks correct.

<!-- ANSWER -->
[
  {
    "tool": "search_flights",
    "args": {
      "origin": "San Francisco",
      "dest": "Tokyo",
      "date": "2024-05-10",
      "max_price_usd": 1200
    }
  },
  {
    "tool": "book_hotel",
    "args": {
      "city": "Tokyo",
      "checkin": "2024-05-10",
      "checkout": "2024-05-17",
      "guests": 2,
      "max_price_usd_per_night": 200
    }
  },
  {
    "tool": "get_weather",
    "args": {
      "city": "Tokyo",
      "units": "metric"
    }
  }
]