Parley
Industrial Agents Hackathon · Munich 2026 · Track Tacto
Code does the math, AI does the talking: verified facts and equal-cost trades, built on game theory.
Problem
Price adjustment from 01 November 2026
Owing to sustained increases in energy, raw material and wage costs, we are forced to adjust our prices for volute casing HN 50-200 by 9.5 %: from EUR 126.53 to EUR 138.55 per piece.
to: Purchasing, Hollerau Pumpenwerke
To answer it well, a buyer checks
The supplier checks every argument against the same data. Only solid facts move the price.
Source: supplier letter of 11 Sep 2026, practice case P01; Tacto Negotiation Arena data package (33,000 rows in 24 tables).
What Parley does
The e-mail, the quote PDF and three years of history with this supplier.
Up to ten e-mails. Every offer becomes one total cost over the contract term.
Accept the cheapest offer that keeps every must-have, or walk away when the alternative is cheaper.
Score = share of the possible saving it captures, from the opening offer to the best possible deal.
AcceptHow it works
Each with its source ID. Profiles built offline, checked by code; we keep only what passes our gate.
Two or three packages per round at about the same estimated total cost. The supplier’s pick shows what it values; our steps answer its steps.
Accept, hold or walk, with the reason. Templates write the e-mail; the model stays off.
On-time delivery averaged 81.8 % sc:70210@2026Q3. Package 1: €28.58, 14 days net, 35 days lead time.
Game-theory-inspired bargaining: preference probing and bounded reciprocal concessions (agent/policy.py, packages()). Details: backup B1.
Backup · how it works in detail
Supplier profile, cost floor, and facts with checked data IDs.
Prices every combination of terms as total cost, and finds sheets at about the same estimated cost.
Anchor, concession steps, guards G1–G9, accept or walk away.
Reads the reply: status, verdicts, signal sentences.
No measurable gain in our paired tests, so the final runs on templates.
Arena score = Copen − CdealCopen − Cbest
Share of the possible saving. C = total cost over the contract horizon. Hard: every must-have kept, never worse than the opening, walk if the alternative is cheaper. Tie: fewer rounds, in 8-minute waves.
C countsprice × volumeuncovered need + riskpayment interestfreight (Incoterm)late lead timedefects − chargebackstoolingindex path + risksupplier margin
Leverspricepayment dayslead timecontract monthsvolumeeffective dateindex clauseppm · chargeback
Saturday practice · v1 · case P05 · RFQ
Source: our Saturday practice session P05, Parley v1, Sat 24 Oct (replay e642aeb72a327558). Round 1 offered €28.58 paid in 14 days or €28.68 in 30 days, both 35-day delivery, similar estimated cost. Figures and packages from code; the final build writes every e-mail from templates. Dossier: Tacto’s data package. Supplier and portrait fictional.
From our own practice runs · case P02
Practice case P02 · arena score by build
Strategic supplier: the brief says a healthy supplier counts, not only the lowest price.
Source: our arena practice runs on P02 (our arena practice log): v1.16 029552b2c280199e, v1.22 0885001f42db6d2e, v1.30 da71ec8f9b9db3e1, final build settings ebe0c9d87c1f3cc8; arena cost breakdown of the v1.16 deal; agent test test_our_cost_matches_the_arena_including_the_supplier_health_charge.
Decision log · Saturday practice · v1 · case P05
anchor at 28.80 on the standing structure (20.0% below)
Cites offer:70240-0 idx:AS-14404 sc:70210. Three packages, about the same estimated cost for us: €28.58, €28.68, €28.41.
move 4% of the gap (the supplier announced an internal step: hold)
He said he had to check internally. Two packages: €28.64, €28.74.
every thread has finished; accept the cheapest standing offer C=244,164
Accepts €28.64, cheapest by total cost over 24 months.
Source: decision journal of our Saturday practice session P05, Parley v1, Sat 24 Oct (replay e642aeb72a327558); reasons verbatim, e-mails condensed. Supplier fictional.
Backup · from our own practice run · case P11
We are happy to present our offer: €47.00 per unit, quality commitment 6,400 ppm.
Your on-time delivery averaged 70.8 % over the last two quarters sc:70140@2026Q3, plus two price indices that fell. Three packages, each equal cost for us.
We checked the delivery record data you cited; it holds. Our terms: €46.50 per unit, 300 ppm.
Source: Parley v1 practice session, Sat 24 Oct, decision journal and arena replay. E-mails condensed.
Results · practice, Sat 24 – Sun 25 Oct
0.792
equal-weight mean over ten practice cases, v1.38 candidate, no model, one session each, no zeros
0.850
on seven cases
0.658
on the three earlier-labelled hold-outs
Model test · v1.990 paired games, full model minus none +0.0001worst-5 % decision time, without / with 0.21 s / 7.43 sfinal: buyer model calls 0
Identical repeats show it reproduces, not that it is independently validated. Source: our arena practice runs (agent/MERGES.md, v1.38 live record); ablation from the v1.9 test, not measured on v1.38 (README.md).
Real suppliers
Rules it plays by
Parley
parley.sorevo.de
Demo, videos and replays