Datasets:

leibler
/

airline

bucket stringclasses 13 values	instruction stringlengths 18 173	recordings int64 0 3	refused bool 1 class	replay_confirmed bool 2 classes	stage stringclasses 5 values	stopped_because stringclasses 9 values	task_id stringlengths 17 17	trusted bool 2 classes
null	Book a round-trip flight from San Francisco to New York for 3 passengers and check the delayed flight on the most recent reservation.	0	false	false	clustered	no replay of the Task was confirmed	task_f6f0d30eac9d	false
w0t3+p2+	Change flight to Flight HAT266 and refund $23 to gift_card_5634230	1	false	true	trusted	null	task_528c53bffc1d	true
null	Cancel all upcoming flights.	1	false	true	verifier_derived	the D79 suite did not pass	task_30294932f5ee	false
w1t3+p2+	Cancel reservation 3RK2T9 for a full refund	2	false	true	trusted	null	task_557841eb4d3d	true
w0t3+p2+	Change return flight from ATL to LAX to nonstop ATL to LAS	2	false	true	trusted	null	task_08942eb570d5	true
null	Request maximum compensation for delay on flight HAT045	0	false	false	verifier_derived	the D79 suite did not pass	task_66aa3689e1e9	false
w0t2p2+	Cancel reservation SI5UKW and process a refund.	2	false	true	trusted	null	task_05cdea43afd6	true
w0t3+p2+	Review reservation EHGLP3 for a refund option.	1	false	true	trusted	null	task_40d54df3fb65	true
null	Escalate delayed flight HAT039 for reason and compensation	0	false	false	verifier_derived	the D79 suite did not pass	task_49d91406aa90	false
null	Change the IAH-to-SEA flight from May 23 to May 24 and upgrade all passengers to business class	0	false	false	clustered	no replay of the Task was confirmed	task_f77fdc2bf6ea	false
w0t3+p2+	Cancel this reservation with a refund to the original payment method	1	false	true	trusted	null	task_2d5aed176a29	true
null	cancel reservation H8Q05L only with a full refund	1	false	true	verifier_derived	the D79 suite did not pass	task_1167e8417798	false
w0t3+p2+	Cancel the entire change request for reservation HXDUBJ	1	false	true	trusted	null	task_542f4d59bc86	true
w0t2p2+	Cancel reservation EHGLP3 for a refund	2	false	true	trusted	null	task_6a4e95b5e490	true
null	Talk about compensation for a canceled business flight and missed meeting.	1	false	true	verifier_derived	the D79 suite did not pass	task_f22ea7da83c0	false
w0t3+p2+	Change the May 17 JFK flight to a nonstop flight under $100	3	false	true	trusted	null	task_3c505ad0d9fe	true
w0t2p2+	Do not cancel H8Q05L	2	false	true	trusted	null	task_962b8775bdef	true
w0t1p2+	Add travel insurance to reservation PEP4E0.	2	false	true	verifier_derived	the D79 suite did not pass: empty_fails, loophole_probe_fails, plausible_wrong_fails, unsolved_state_fails	task_dc93f93c922a	false
w0t3+p2+	Cancel reservations IFOYYZ and NQNU5R, change reservation M20IZO to a nonstop flight, and transfer to a human agent.	1	false	true	verifier_derived	the D79 suite did not pass: leak_check_clean	task_ce1107f4d7e9	false
w2t3+p1	Change reservation VA5SGQ from DTW ↔ LGA to nonstop DTW ↔ JFK on the same dates with HAT169 and HAT033 in Economy, add 1 checked bag, and refund.	2	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_bd1f972927cd	false
w0t3+p2+	Cancel reservation S61CZX	1	false	true	trusted	null	task_86f0b3db309e	true
w1t3+p2+	Change booking to May 24 Economy from ATL to PHL	1	false	true	trusted	null	task_5468381972ed	true
null	Change reservation OWZ4XL to a nonstop flight from EWR to LAX on May 21	2	false	true	replay_confirmed	the Reference is not confirmed	task_baccfbb3c8dc	false
w0t1p2+	Cancel travel insurance and get a full refund; do not cancel the flight.	1	false	true	verifier_derived	the D79 suite did not pass: empty_fails, loophole_probe_fails, plausible_wrong_fails, unsolved_state_fails	task_4a328edad44f	false
w0t1p2+	Cancel the travel insurance and receive a full refund for the insurance while keeping the flight.	1	false	true	verifier_derived	the D79 suite did not pass: empty_fails, loophole_probe_fails, plausible_wrong_fails, unsolved_state_fails	task_79beec2e0847	false
null	Change flight dates on reservation EUJUY6	1	false	true	verifier_derived	the D79 suite did not pass	task_75e0754e898f	false
null	Cancel reservation 3FRNFB and get a refund	2	false	true	verifier_derived	the D79 suite did not pass	task_1952641f1717	false
w0t1p2+	Cancel travel insurance and get a full refund without canceling flight	1	false	true	verifier_derived	the D79 suite did not pass: empty_fails, loophole_probe_fails, plausible_wrong_fails, unsolved_state_fails	task_61af524de90b	false
w1t3+p2+	Change flight to the cheapest Economy option on May 24th and issue refund to the original payment method.	1	false	true	trusted	null	task_51a6665c9c3c	true
w0t3+p2+	Cancel reservation 3RK2T9 and request a refund due to illness.	3	false	true	trusted	null	task_5a7596b03468	true
null	Increase compensation for delayed trip for 3 passengers	0	false	false	clustered	no replay of the Task was confirmed	task_e4c508d93c0c	false
null	Cancel reservation S61CZX	0	false	false	verifier_derived	the D79 suite did not pass	task_606a18918ecd	false
null	Book one-way economy flight EWR → DFW → SEA on May 20 for 1 passenger with 3 bags using two certificates.	0	false	false	clustered	no replay of the Task was confirmed	task_e436d148aa97	false
null	Change reservation dates	2	false	true	verifier_derived	the D79 suite did not pass	task_d0e60f60485d	false
w0t3+p1	confirm total number of checked suitcases allowed including status allowance and verify status	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_f16f524578a8	false
w1t1p1	Cancel all upcoming flights with one passenger on the reservation to give up the seat for someone else.	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_d14a4f6c7cb3	false
w0t3+p2+	Issue compensation for a canceled flight and missed meeting.	2	false	true	trusted	null	task_697144081a8a	true
null	Provide the reason, updated departure time, and compensation for delayed flight HAT039.	0	false	false	verifier_derived	the D79 suite did not pass	task_e3a1f977eb5c	false
null	Transfer to a human agent to review the delayed flight	0	false	false	clustered	no replay of the Task was confirmed	task_725b0563c27a	false
w0t2p1	Cancel bookings IFOYYZ and NQNU5R and upgrade M20IZO to business class	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_c3ec3ddd0986	false
null	Check delay, offer compensation, confirm passenger count, and transfer to a human agent.	0	false	false	verifier_derived	the D79 suite did not pass	task_f1553ebf81b8	false
w0t3+p2+	Cancel reservation S61CZX and check paid upgrade options for H8Q05L and NM1VX1 before making any changes	1	false	true	trusted	null	task_4d2d4acb81e4	true
w0t3+p2+	Cancel flight 3RK2T9 and get a full refund under the 24-hour rule.	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_2d0e9eaf6520	false
w0t3+p2+	Change reservation HXDUBJ.	1	false	true	trusted	null	task_061291e80289	true
null	Cancel reservation S61CZX	0	false	false	verifier_derived	the D79 suite did not pass	task_b0607004b8d3	false
w0t3+p2+	Change return flight to May 27, add one extra checked bag, keep economy, and charge $59 to gift card.	1	false	true	trusted	null	task_d968d7d72375	true
null	File a complaint and get compensation for canceled flight and missed meeting.	1	false	true	verifier_derived	the D79 suite did not pass	task_f7f3aaa2434b	false
w0t2p2+	Cancel one flight on May 17	2	false	true	trusted	null	task_252ddfdd1a57	true
null	Cancel reservation M20IZO and issue a full refund, then book a new flight from JFK to SFO on May 24.	1	false	true	verifier_derived	the D79 suite did not pass	task_179fb4d38a3e	false
null	Cancel reservation EHGLP3	1	false	true	replay_confirmed	the Reference is not confirmed	task_f8b0c276f920	false
null	Transfer to a supervisor to confirm total allowed suitcases as a number.	2	false	true	verifier_derived	the D79 suite did not pass	task_56a08f180510	false
null	Request compensation for delayed flight HAT045 without changing or canceling reservation	0	false	false	verifier_derived	the D79 suite did not pass	task_e3be3f4b1b92	false
w0t3+p2+	Change reservation HXDUBJ: move outgoing flight to a nonstop option next day and move return from SFO back one day	2	false	true	trusted	null	task_ead8718f2ebd	true
w2t3+p1	Change the passenger name to Omar Rossi, upgrade the ticket to economy class, and add 3 checked bags.	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_cb27675a6de9	false
null	Cancel reservation SI5UKW and provide a refund	1	false	true	replay_confirmed	the Reference is not confirmed	task_735337ad9568	false
w0t3+p2+	Transfer to a human agent to review notes	1	false	true	trusted	null	task_61542240d789	true
null	Cancel travel insurance, get a full refund, and do not cancel the flight.	1	false	true	replay_confirmed	the Reference is not confirmed	task_b9162be654d8	false
w0t2p2+	Cancel flights from MCO to CLT and request a full refund for both passengers.	1	false	true	trusted	null	task_1754ee96968d	true
w0t3+p2+	Change existing reservation return from ATL to LAX to nonstop ATL to LAS.	1	false	true	trusted	null	task_d756773f582d	true
w0t1p2+	Change reservation EUJUY6 date two days later	1	false	true	trusted	null	task_3f70e11524fb	true
w0t2p1	Downgrade all business-class flights to economy and refund each reservation to the original payment method	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_4d1c732cbc7e	false
null	Check goodwill compensation for delayed flight HAT040	0	false	false	verifier_derived	the D79 suite did not pass	task_168047ace682	false
w0t3+p2+	Cancel reservation with a refund	1	false	true	trusted	null	task_d68bbb3b6b89	true
w0t3+p2+	Cancel reservation 3FRNFB and issue a refund	1	false	true	trusted	null	task_f86f1bc0c6f4	true
null	See if any compensation is possible for the delay on HAT018.	0	false	false	clustered	no replay of the Task was confirmed	task_45776b907a87	false
w0t3+p2+	Cancel reservation GV1N64 and refund $5,700 to gift_card_1642017.	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_e6e2e1a48576	false
w0t3+p2+	Double-check Gold, tell total number of suitcases in numeric form, and transfer to a supervisor	1	false	true	verifier_derived	the D79 suite did not pass: empty_fails, loophole_probe_fails, plausible_wrong_fails, unsolved_state_fails	task_aa701f2f144d	false
null	Book the JFK–SEA direct round-trip in Basic Economy for Mia Kim.	2	false	true	verifier_derived	the D79 suite did not pass	task_95faadf088e3	false
w1t3+p1	Create a new reservation with travel insurance included	1	false	true	verifier_derived	the D79 suite did not pass: leak_check_clean, oracle_passes, second_path_passes	task_d4bc0277beb4	false
null	Book a reservation for Ivan Smith only, exactly the same as my current reservation, using gift card + credit card	0	false	false	clustered	no replay of the Task was confirmed	task_988a69118b0a	false
null	Book a new reservation for Ivan Smith only, exactly the same itinerary as my current reservation.	1	false	true	verifier_derived	the D79 suite did not pass	task_1e816eed8ee4	false
null	Cancel reservation M20IZO, issue a full refund, and book a new flight from JFK to SFO on May 24.	1	false	true	replay_confirmed	the Reference is not confirmed	task_6e4160da5873	false
w1t3+p1	Book a one-way economy flight from New York to Seattle on May 20	1	false	true	verifier_derived	the D79 suite did not pass: oracle_passes, second_path_passes	task_a07d76a10591	false
w1t3+p1	Book a one-way flight from ORD to PHL on May 26 on HAT271 in economy for Sophia Silva and Kevin Smith.	1	false	true	verifier_derived	the D79 suite did not pass: oracle_passes, second_path_passes	task_d8a486b8fdcb	false
null	Book a one-way flight from ORD to PHL on May 26.	2	false	true	replay_confirmed	the Reference is not confirmed	task_30b30f730ac5	false
null	Check gift card and certificate balances, cancel reservation K1NW8N, and book the business class round trip.	0	false	false	clustered	no replay of the Task was confirmed	task_c1a02aad9e42	false
null	Cancel reservation K1NW8N and book a new business class reservation	0	false	false	clustered	no replay of the Task was confirmed	task_0b71e0ad90a9	false
null	Book a one-way economy flight from NYC to SEA on May 20.	0	false	false	clustered	no replay of the Task was confirmed	task_0c4d60c351f9	false
null	Cancel reservation K1NW8N and book the new business-class itinerary.	0	false	false	clustered	no replay of the Task was confirmed	task_baafb147a228	false
null	Cancel reservation M20IZO with a full refund and book the second cheapest May 24 JFK → SFO flight in economy.	1	false	true	replay_confirmed	the Reference is not confirmed	task_08c5b1196bdc	false
null	Cancel reservation K1NW8N, refund $567 to gift_card_6136092, and book three separate business-class round trips	0	false	false	clustered	no replay of the Task was confirmed	task_12e74c273ca8	false
w2t3+p1	Cancel reservation M20IZO and book a new one-way economy flight from JFK to SFO on May 24.	1	false	true	verifier_derived	the D79 suite did not pass: oracle_passes, second_path_passes	task_7ef5c1e80ad5	false
w1t3+p1	Cancel reservation Z7GOZK	2	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_246dc9a6dbea	false
w3+t3+p2+	Cancel reservations FDZ0T5, HSR97W, HTR26G, and MFRB94	1	false	true	trusted	null	task_060da6524df3	true
w2t3+p2+	Cancel reservations FDZ0T5 and HSR97W	2	false	true	trusted	null	task_bfc1dc1dc73b	true
w1t3+p1	Cancel all upcoming flights with one passenger.	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_4db3f209a126	false
w1t3+p1	Cancel reservation	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_cc5de08b913a	false
w1t3+p2+	Cancel reservation PEP4E0 and process a full refund.	2	false	true	trusted	null	task_f4f630a1479b	true
null	Cancel reservation K1NW8N and book the cheapest business-class round trip.	0	false	false	clustered	no replay of the Task was confirmed	task_ecc50ec17fb7	false
w3+t3+p2+	Cancel all upcoming flights.	2	false	true	trusted	null	task_522b4862c549	true
w3+t3+p1	Cancel all upcoming reservations	1	false	true	verifier_derived	the D79 suite did not pass: second_path_passes	task_286663e6bb2b	false
w1t3+p2+	Cancel reservation PEP4E0 and process the full refund of $128.	1	false	true	trusted	null	task_56d73622cfe4	true
w1t3+p2+	Cancel reservation PEP4E0 and process a full refund.	1	false	true	trusted	null	task_d5fca48d2cc4	true
w2t3+p2+	Cancel FDZ0T5 and HSR97W and process refunds.	1	false	true	trusted	null	task_d060cced661b	true
w1t3+p2+	Cancel reservation Q69X3R.	1	false	true	trusted	null	task_36cf12206f6d	true
w3+t3+p2+	Upgrade XEHM4B to Business, cancel XEHM4B and 59XX6W, and do I have any other upcoming flights and what’s the total cost?	3	false	true	verifier_passed	the Verifier passed the suite and is not the trusted one	task_7cc03b8bfc5c	false
w1t3+p2+	Add 2 checked bags under Chen Lee to reservation YAX4DR	2	false	true	trusted	null	task_5c94a5fc62ab	true
null	Add 3 checked bags, change passenger to Omar Rossi, and upgrade to economy.	0	false	false	verifier_derived	the D79 suite did not pass	task_76103ac019be	false
w1t3+p2+	Add 2 checked bags to reservation YAX4DR	1	false	true	trusted	null	task_f0fbf214b729	true
null	Change reservation VA5SGQ to HAT169 and HAT033 in Economy on DTW ↔ JFK and add 1 checked bag.	0	false	false	clustered	no replay of the Task was confirmed	task_909474c5e541	false

End of preview. Expand in Data Studio

airline

An executable Environment for evaluating and training tool-using agents. Kullback built it from recorded traces of a working agent, and Leibler publishes it.

The package holds the rebuilt world: a database, one function per tool that behaves the way the real tool was observed to behave, the compiled policy, and the Starting state each Task begins from. It also holds the Task list with the instruction a candidate gets, and a code-only Verifier per Task that grades the candidate on what it changed. It holds none of the recordings it was built from.

tasks.jsonl is the Task list as one row per line, which is what the viewer shows: the id, the instruction, how far the Task got up the funnel and its difficulty bucket. Everything else in the package is the world and the graders, and only the harness reads those.

This Environment is under active development. Each build round republishes it with new numbers, and earlier rounds stay reachable by their tags. The next stage is to raise the trusted count, then to generate Tasks synthetically over the rebuilt world, on top of the recorded ones.

Preview. This Environment is below the 90% replay fidelity bar for a release. It replays 72.3% of its Tasks and has 38 trusted Tasks of 119. It is published so the numbers are public while it improves. Read them before you use it.

Numbers


Tasks	119
Replay fidelity, Tasks	72.3% (86 of 119)
Replay fidelity, Runs	71.0% (135 of 190)
Reference confirmed	61
Verifier derived	84
Trusted Tasks	38
Refused Tasks	0
Round	3
Content hash	6f4be1d3ce5dc605

By difficulty

A bucket is the number of writes a Task makes, the tools its Reference called and the paths to its End state, each banded. The same bucket means the same thing in every Environment.

Bucket	Tasks	Trusted
w0t1p2+	5	1
w0t2p1	2	0
w0t2p2+	5	5
w0t3+p1	1	0
w0t3+p2+	21	17
w1t1p1	1	0
w1t2p2+	1	1
w1t3+p1	6	0
w1t3+p2+	10	10
w2t3+p1	3	0
w2t3+p2+	2	2
w3+t3+p1	1	0
w3+t3+p2+	3	2

How a Task becomes trusted

Every Task climbs a funnel, and every rung is a code check. A Task clears replay fidelity when the rebuilt tools answer its recorded calls the way the real ones did. It keeps a Reference when the recordings agree on an End state, and gets a Verifier derived from that Reference. It counts as trusted once that Verifier rejects an empty Run, a plausible wrong Run and a mutated Run, passes no loophole probe, accepts a second route to the same End state, and turns away few enough held-out Runs that did reach the Reference. The table above is that funnel, rung by rung, so a Task that stops early stays visible instead of dropping out of the denominator.

Fetch and run

uv run kullback fetch leibler/airline --out env-airline
uv run kullback run --workdir env-airline --task <task id> --model provider/model
uv run kullback verdict --workdir env-airline
uv run kullback report --workdir env-airline

fetch checks the package against the content hash above before laying it out, and refuses one that does not match. --revision round-<n> fetches an earlier round.

Source

Corpus: tau2-bench
Corpus licence: MIT
Corpus source: https://github.com/sierra-research/tau2-bench
Harness: kullback 0.1.0, git a964e8161e2f5d94, runner 7c869f813a9f7c0b, gates b281d24f485f5e8e
Environment id: 6bbabd488edd9a03
Built at: 2026-09-09T15:56:21+00:00

What it cannot do yet

81 of 119 Tasks are not trusted. Their Verifier has not passed the suite, so the harness will not grade a candidate on them.
23 Tasks: the D79 suite did not pass.
22 Tasks: no replay of the Task was confirmed.
13 Tasks: the Reference is not confirmed.
7 tools were served by a stand-in at some point in the build (book_reservation, get_flight_status, search_direct_flight, search_onestop_flight, update_reservation_baggages, update_reservation_flights, update_reservation_passengers). A Run that touches one is reported and never counted.
6 more Tasks appeared after the Task list was frozen. They are outside every number on this page, because the denominator is fixed once and never moved.
The simulated user does not ship. Its facts come from the recordings, which stay private, so a Task whose answer the user only gives mid conversation cannot be finished here, even though its Verifier still grades it.
The export checked 27649 strings across 205 graded files against the 15309 strings in the source corpus. It found 0 recorded strings (any would have stopped the export) and 0 short values that only a Verifier's answer key accounts for.

Licence

The harness and this package are Apache-2.0. The source corpus keeps its own licence (MIT).

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Collection including leibler/airline

Kullback Environments

Collection

Executable Environments rebuilt from agent traces by Kullback and graded by code. Each card carries its own replay fidelity and trusted Task count. • 3 items • Updated 3 days ago