The stepped engine becomes a runnable taskset. protocol.py is both the
render/parse boundary and the security boundary: TurnView carries the live
Market, so view.market.items[i].prices is the whole held-out series and a
foresight policy reading it earned +9.4% on the oracle. The renderer emits only
observed ticks, the trace carries plain scalars, and a sentinel scan of every
rendered turn fails if either reopens. House rule 1 had no other enforcement.
Replies are a delta sheet and parsing never raises — NaN, Infinity, 1e309 and
20k-deep nesting all resolve to a hold, because the one-shot form has already
shown what a real model sends when it gives up.
LiveExchangeEnv.run drives the engine host-side with the harness left null. Two
things learned the hard way and worth keeping: a terminated Segment mid-window
holds the remaining looks instead of raising, and rewards are recorded INSIDE
the interaction, before close. Recording after close writes the traces correctly
and leaves every eval.log line reading reward=0.000 — the canonical verifiers
reference does it after the block; do not copy it there.
The reference-family gate is widened from four named rungs to the whole 8x8
(requote_band, idle_share) family: no member may out-earn the shipped reference
by more than 1.02x, and any that does must still score >= 0.90. That is the check
that caught the first draft's fake 0.152 gap, now shipped rather than remembered.
Also guards `clean` on the reference being profitable, here and in the one-shot
form. Against a reference that lost money the bar is negative, so doing nothing
cleared it and inaction collected a quarter of the reward. Unreachable while
viable_market admits only profitable references; one relaxed filter from
reachable, and exactly the floor house rule 3 forbids. Probe values unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Arena's first interactive environment, as its own wheel beside grand-exchange so
the one-shot scores stay comparable rather than conflated. One basket of orders
becomes a loop: quote, see fills and the next tick, re-quote, with inventory,
open orders and cash carrying between turns.
The engine and its measurement only. No taskset, no config, no probe row — the
spec's constants were derived from a throwaway engine and did not reconcile
(impatient computed to 0.612 against a reported 0.623), so every constant here
is chosen from a ladder re-measured in the code that ships.
House rule 4 asks whether the turn budget binds. It does: exhaustive 0.631 vs
oracle 1.000, gap 0.369, stdev 0.054 over five blocks, worst block 0.316, and
0.354-0.405 at four further seed bases. That is 18x the proposed margin and it
clears the 0.25 quantum of the binary gate outright, so the comparison is not a
cliff. The saturation worry does not fire: per-basket clipping is not clipping
the mean, so exhaustive averages 0.849 on profit_ratio rather than 1.000.
The first draft's gap was FAKE — a clean-looking 0.152 produced by an under-tuned
denominator whose every-look sibling earned 22% more gp while scoring below it.
It was caught only by sweeping the reference's own family. Nothing that scores
below the oracle may earn more than it; that check belongs in every interactive
environment that follows this one.
freeze is derived from market.seed inside build_market so viability and scoring
see one value, roc is on peak rather than average capital employed, and the
reference is cached per seed so scoring never re-simulates the played episode.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
kartiandClaude Opus 5