What was done
ptitty12 has Claude agents write all the code for a decompilation of MVP Baseball 2005, gated by a verifier. The stated goals are a browser build, online play and easy roster mods.
ptitty12 describes this project as driven entirely by Claude. The README says AI agents write every line of code and docs, Claude Code and Codex agents work under the same rules, and the verifier decides, not any agent.
How it was done
The target is MVP Baseball 2005 for the GameCube (GV4E69, USA, rev 0). The repository holds source, tooling and docs only, never game data. Each player brings a disc image dumped from their own copy and everything derived stays in their browser. Two tracks feed the product: a decompilation, and engine work that does not depend on decompilation source, so that mods never need rework when the decompilation moves.
Results
The README status table reports 87.4% of functions matched. Smaller knowledge targets show, for example, 251 of 299 SDK boundary functions matched with 143 named, and 56 of 60 roster data functions matched. The stated goals are running in a web browser, browser multiplayer with matchmaking on the owner's server for the new build, and easy new rosters and teams.