tools/playthrough.mjs exists to show a reader why a measured number is what it is. I cited
it to another session — read seed 2, see the wipe the 45% row is made of — and the
reproduction failed in front of them. They reported different outcomes at both seeds and
guessed the cause correctly from outside: the two tools were not drawing from the same
stream.
They were not. simulate.mjs used a private mulberry32 makeRng; playthrough.mjs had its own
LCG written to look like it. Both deterministic, both reproducible alone, and "seed 2"
named a different fight in each — which breaks the only thing the tool is for. Its own
comment claimed a seed here names the same fight there. check-focus carried a third copy of
that LCG, so the two guards described the same game with different dice.
makeRng is exported and both files use it. A playthrough seed is now exactly the first
fight of simulate.mjs --seed <n>: --runs 1 --seed 2 and the playthrough give 9 rounds, 4 of
4 down, 1 dead, both.
The other half was my citation rather than the code: the command I sent omitted --mode, so
it plays both targeting arms and prints two fights. They read the last line, I quoted the
first. The summary line now names the arm.
check-focus re-recorded under the shared stream; figures move a point or two. What it buys
is that the bimodality analysis now reproduces the published means exactly — 2.31, 3.03,
0.40, 0.42 against the four rows CLEAN GROUND publishes. Under the old LCG it agreed to
within a decimal, which looked like corroboration and was two experiments landing near each
other.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The tool could only narrate the guard's fight — the frozen four, at the pack size
focus-baseline records. CLEAN GROUND's EXPOSURE table measures something else entirely: a
declared cast of six at counts of 1, 3, 6, 10 and 15, which is the fight a GM running that
case will actually referee and the one whose numbers we have just re-pinned.
--creature, --count, --party, --seed and --mode now mirror tools/simulate.mjs, so a row
measured there can be read here in words. Positional form still works.
node tools/playthrough.mjs --creature quiet_neighbours_npc --count 6 \
--party ashcroft,bhattacharya,renshaw,braithwaite,pollard,okonkwo --seed 11
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Reading a narrated supporter fight showed it being hit on armR and head. It has wings; it
has never had arms. Three defects, all in the pipeline every published number comes from.
1. It located hits by species, not body plan — simulate.mjs read defender.species where
the game writes spec.bodyPlan ?? spec.species ?? "baseline" into speciesProfile
(build-packs.mjs:294). The barghest, kelpie and church grim were fought on two legs
with arms, and the supporter with no wings, so the fight its tactics call the one the
agents can win could not occur in a measured fight.
2. Armour was one scalar for the whole creature, and the harness's locations had no
armour field. Bare wings, the grounded halving and the vital exemption — R-254 and
R-255 — were invisible to every number. Worn armour was summed the same way, which put
a stab vest on a cleaner's head.
3. Nothing was ever grounded: a wing could be ruined and the creature kept flying.
Fixed in the game's order — locate, then apply what that location carries, every term
imported from rules.mjs. A ruined wing calls groundedPlanFor and the wounds carry across
by severity through remapLocationDamage, the function _preUpdate uses.
A bug of mine no guard would have caught: remapLocationDamage returns { damage, moved,
rescaled } and my first draft passed the whole object where a damage map was expected, so
every wound a creature carried was forgiven the moment it came down. check-lethality would
have passed it — fewer wounds means a longer fight, which reads as a number moving, and
this commit moves numbers. Found by probing a landing by hand.
20 of 47 creatures moved, 18 deadlier and 2 less. The supporter goes 69.3% -> 25.1% wiped,
3.38 -> 2.16 down, second deadliest to fourth: it was being measured as a 30-hit-point
creature in uniform armour 9 that could not be grounded. The small rises elsewhere are the
party's armour no longer covering locations it never protected.
check-focus then caught the page overclaiming, which is what it is for: focus fire still
helps in all 30 but only 28 clear their own noise where 31 of 31 did. The guard was
asserting more than the page needs — the bestiary prints that count from the artifact and
cannot overstate it — so it now checks only what the page asserts outright, and the page
rewrote itself to "in 28 of them".
Both baselines re-recorded. Minor version, not a patch: the published numbers changed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Every guard here reports a number per creature, and a number cannot say why a fight went
the way it did. That gap is what produced R-258 through R-260: each written from a side
harness built to watch a fight, each modelling something slightly different from the game,
two of the three wrong in ways no guard could catch because no guard was involved.
runFight takes an optional `say` sink. It reports what the simulator already decided — the
attack roll and its target, a defence and the penalty it was made at, the landing level
after a dodge downgrades it, damage against armour before and after armourAgainst, the
location, major wounds, disablement, death. It never touches the generator, so a narrated
fight and a silent one are the same fight; check-lethality and check-focus both still
match their baselines exactly with the hook in place.
tools/playthrough.mjs (npm run play) is its consumer, in the same commit deliberately: a
hook with no reader is the exact defect this project keeps finding in its own rules, and
adding one to the measurement pipeline with only a scratchpad file calling it would have
been committing the thing I have spent the session removing. Pack size comes from
focus-baseline.json so the fight you read is the fight check-focus measures; creatures
recorded as pinned are played solo.
Three redcaps, seed 20260913, same seed both ways. Spread fire: wiped in 10 rounds, 3
dead, and all three redcaps still standing — 39 hit points spread three ways so that none
of it finished anything. Focus fire: same opening, diverging at one target choice in round
1, party wins in 20 with two up. The +13.2 points check-focus records, seen once instead
of averaged.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
