1. A sixteen-turn live DecisionHotelGraph replay

Read this first. This is a complete passing provider-backed run with HOTEL_GRAPH_CURRENT_DATE frozen to 2027-07-15. It exercises a chat model (gpt-4o) and the Jev decision model together. Model wording can vary; normalized criteria, decision boundaries, hotel results, and completion are the durable contracts.

Run it yourself

cd ezgraph-demo
npm run test2:decision-hotel-graph

The script sets USE_ENV=1 KEEP_SESSION=1. The test sends all sixteen turns through one session, semantically judges every reply, and verifies the final durable booking state. It is skipped unless TYPESAFE_API_KEY (for Jev decisions) and OPENAI_API_KEY are set.

Captured live transcript

1 · date range prompt

You
Hi

Bot
What are your Portland check-in and checkout dates?
2 · invalid calendar date

You
February 30, 2027 through March 5, 2027

Bot
February 30, 2027 is not a valid date. Could you please provide valid check-in and checkout dates for your stay in Portland?
3 · valid date range

You
August 1 through August 8, 2027

Bot
What nightly budget range should I use?
4 · invalid inverted budget

You
minimum 800 and maximum 500 per night

Bot
It seems like there’s a contradiction in your budget range, as the minimum is higher than the maximum. Could you please clarify your intended budget range per night?
5 · valid maximum budget

You
maximum 700 per night, with no minimum

Bot
Would you like one bed, two beds, or a suite?
6 · suite selection

You
a suite

Bot
Which hotel amenities do you require?
7 · cross-step date correction

You
Actually change my dates to August 3 through August 9, 2027

Bot
Which hotel amenities do you require?
8 · amenity selection

You
free wifi and free parking

Bot
Do you have an airport or city-center distance limit?
9 · no distance preference

You
distance does not matter
Bot
Current Portland hotel criteria:
- Dates: 2027-08-03 to 2027-08-09
- Nightly budget: no minimum to $700
- Room type: suite
- Amenities: freeWiFi, freeParking
- Distance: no preference
Tell me what to revise, or say “search” when ready.
10 · criteria review

You
show my criteria
Bot
Current Portland hotel criteria:
- Dates: 2027-08-03 to 2027-08-09
- Nightly budget: no minimum to $700
- Room type: suite
- Amenities: freeWiFi, freeParking
- Distance: no preference
Tell me what to revise, or say “search” when ready.
11 · first grounded hotel search

You
search
Bot
1. Hampton Inn & Suites Portland Tigard
  - Address: 11799 SW 69th Ave, Tigard, OR 97223
  - Nightly Price Range: $522 - $600.3
  - Total Price: $3810.60
2. Hilton Garden Inn Portland Airport
  - Address: 12048 NE Airport Way, Portland, OR 97220
  - Nightly Price Range: $576 - $662.4
  - Total Price: $4204.80
3. Hilton Garden Inn Beaverton
  - Address: 15520 NW Gateway Ct, Beaverton, OR 97006
  - Nightly Price Range: $459 - $527.85
  - Total Price: $3350.70
4. Hampton Inn Sherwood Portland
  - Address: 22000 SW Meinecke Parkway Sherwood, Oregon 97140 USA
  - Nightly Price Range: $486 - $558.9
  - Total Price: $3547.80
Please review the options and let me know if you would like to book one of these hotels or revise your search criteria.
12 · revise to restrictive budget

You
change maximum budget to 500 per night
Bot
Current Portland hotel criteria:
- Dates: 2027-08-03 to 2027-08-09
- Nightly budget: no minimum to $500
- Room type: suite
- Amenities: freeWiFi, freeParking
- Distance: no preference
Tell me what to revise, or say “search” when ready.
13 · empty hotel search

You
search

Bot
No hotels matched all current criteria. Tell me whether to revise budget, room type, amenities, or distance.
14 · restore viable budget

You
change maximum budget to 750 per night
Bot
Current Portland hotel criteria:
- Dates: 2027-08-03 to 2027-08-09
- Nightly budget: no minimum to $750
- Room type: suite
- Amenities: freeWiFi, freeParking
- Distance: no preference
Tell me what to revise, or say “search” when ready.
15 · second grounded hotel search

You
search
Bot
Here are the matching Portland hotels:
1. Hampton Inn & Suites Portland Tigard — 11799 SW 69th Ave, Tigard, OR 97223 — nightly $522.00–$600.30 — total $3,810.60
2. Hilton Garden Inn Portland Airport — 12048 NE Airport Way, Portland, OR 97220 — nightly $576.00–$662.40 — total $4,204.80
3. Hilton Garden Inn Beaverton — 15520 NW Gateway Ct, Beaverton, OR 97006 — nightly $459.00–$527.85 — total $3,350.70
4. Hampton Inn Sherwood Portland — 22000 SW Meinecke Parkway Sherwood, Oregon 97140 USA — nightly $486.00–$558.90 — total $3,547.80
Reply with a hotel name or number to book, or tell me which search criterion to revise.
16 · validated hotel booking · completed

You
book hotel 1

Bot
Hampton Inn & Suites Portland Tigard is booked with confirmation #785427. Thank you for choosing Hilton.

The replay includes an invalid date, inverted budget, cross-node date correction, criteria review, empty search, budget recovery, grounded hotel results, and a validated booking.

Under the hood

The transcript shows what the customer saw. This table shows the path through the graph that produced each reply, and how many Jev calls it made. ^J marks a decision node that called Jev. The paths are derived from each turn's response and the node code, since the replay records replies rather than raw decisions, and they add up to the 22 decision calls the final session recorded.

Turn	Customer	Path through the graph	Jev calls
1	Hi	Router^J → `directTo(DateRangeNode)`	1
2	February 30, 2027 through March 5, 2027	DateRangeNode (invalid date not saved; asks again)	0
3	August 1 through August 8, 2027	DateRangeNode saves → Router^J → `directTo(BudgetNode)`	1
4	minimum 800 and maximum 500 per night	BudgetNode (inverted range not saved; asks again)	0
5	maximum 700 per night, with no minimum	BudgetNode saves → Router^J → `directTo(RoomTypeNode)`	1
6	a suite	RoomTypeNode saves → Router^J → `directTo(AmenityNode)`	1
7	Actually change my dates to August 3 through August 9, 2027	AmenityNode `reroute_request` → Router^J → DateRangeNode saves → Router^J → `directTo(AmenityNode)`	2
8	free wifi and free parking	AmenityNode saves → Router^J → `directTo(DistanceNode)`	1
9	distance does not matter	DistanceNode saves → Router^J → summary; resumes at the router	1
10	show my criteria	Router^J (review) → summary	1
11	search	Router^J → Readiness^J → SearchHotelsNode → PresentNode drafts → Presentation^J accepts the draft	3
12	change maximum budget to 500 per night	PresentNode `revise_search` → Router^J → BudgetNode saves → Router^J → summary	2
13	search	Router^J → Readiness^J → SearchHotelsNode finds nothing → Router^J shows the notice	3
14	change maximum budget to 750 per night	Router^J → BudgetNode saves → Router^J → summary	2
15	search	Router^J → Readiness^J → SearchHotelsNode → PresentNode drafts → Presentation^J; the code-rendered list is shown	3
16	book hotel 1	PresentNode `chosen_hotel` → `finish()`	0

Four patterns account for almost everything:

Every saved value sends the router back to Jev in the same turn, to choose the next question. That is the only call on turns 3, 5, 6, 8, and 9, and the second call on turns 7, 12, and 14.
Invalid values never reach a decision node. Turns 2 and 4 stay inside a collector, whose model asks again after the handler returns stay() or after it declines to call the tool.
A correction is one turn (turn 7), because the router can forward the customer's message to another collector.
Every search costs three decision calls: the router, the readiness judge, and either the presentation judge or the router again for the no-match notice.

The final session also recorded 30,693 decision tokens and 11,473 chat-model tokens. Lesson 9 breaks the decision calls down by node.

2. Graph, state, and history spaces maps the nodes and state owners behind the replay.

1. A sixteen-turn live DecisionHotelGraph replay

Run it yourself

Captured live transcript

Under the hood

Next