0c2910636a
sylpheed-port found that a shared CARGO_TARGET_DIR across two source trees serves one binary to both: cargo fingerprints per source path, so building tree B into a directory last written by tree A prints "Finished" in 0.15 s and changes nothing. Their harness scored against a decoder from an unnamed tree for hours, and it HAPPENED to be the correct era -- agreeing by luck, which is worse than disagreeing because nothing prompts the check. My own era comparison could have died the same way, so I audited it rather than assuming it was fine: the two binaries have different md5s (7516bdac vs 8370e0e9), they were built into SEPARATE target dirs, and the era control still distinguishes them live -- `rest t=70 [12 70 80 -]` against `rest t=12 [0 12 70 80]`. The result in ui-resting-pose.md stands, now with the evidence that it stands. Also raises main-is-the-stale-era.md from hygiene to a defect anyone can build. Two things landed since it was written: the corrected association is now confirmed against the running game (RMSE 41.69 vs 58.41 on a live title_jp capture, a margin ~14x the noise floor), and the port confirmed their published branch carries the stale ui_layout.rs, md5-identical to main's. So every published ref except this branch ships the decoder the game disagrees with, and nothing in a build warns you. Merging is a human's call; the page records the cost of not making it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
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.