e005016751
The Decoder sharpened the sweep in a way that invalidates part of how I ran it: an in-range fallback cannot be caught by inspecting output, because the output looks exactly like the true case -- the only way to know is to count how often it fires. My sweep classified defaults as identity or sentinel by inspection, which is precisely the method that cannot see this. Counted: rotation_deg -> 0 fires 0 times in 866 keyframes and 178 rest poses, and ramp is present in authored/. So rotation is read, not invented -- the same conclusion they reached for design size, reachable only by counting. The count exposed one I had waved through twice: black_hold_units defaults to 0.0 and its authored value IS 0, so deleting the entry would be invisible -- same behaviour, no error, and the reasoning in black_hold_why (four measured gaps, why 0 over the better-fitting 4 or 6, the tripwire) silently stops applying. Fixed the same way as exit_ramp_units: fallback is -1.0 and an absent key raises an error naming what was lost. The control is the demonstration: key present 0 errors, key deleted 1 error, and the render byte-identical either way. No output inspection could have detected the deletion. Does not change the value: still 0, still wrong by 4-6 units on three of four measured transitions, still no rule. Only its absence is now audible. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.