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How to continue a community decomp using your own game copy with Decomp WTF

Fork a decomp.dev project and let agents match more functions, committed to git for review.

Authorization notice. Decomp WTF is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Reverse engineering. The contributions are reverse engineered from a game, so only work on games you own and check the target project's rules on AI-made code before sending anything upstream.

Who it is forA decompilation contributor who wants to speed up an existing community project for a game they own.

The problemPublic decomp projects have many unmatched functions, and manually working through them is slow.

The outcomeA local decomp-wtf branch with one git commit per match, ready for the contributor to review and optionally send upstream.

What you need first

  • A game you own, as a ROM, disc image or program file (the README says to use it only on games you own)
  • Linux, or Windows with WSL 2 (Windows support is marked unstable); macOS is not supported
  • An AI agent such as Claude Code, Codex, Antigravity CLI or opencode, or an API key for another model
  • A terminal and basic familiarity with C and MIPS or PowerPC assembly

Steps

  1. Install Decomp WTF with curl -fsSL https://decomp.wtf/install.sh | bash on Linux, or use the Windows installer on Windows.
  2. In the app, browse the decomp.dev catalog and fork the project you want, which is cloned to a local decomp-wtf branch.
  3. Add your own copy of the game so the project's own setup can run.
  4. Add agents, then review each match, which appears as a git commit on decomp-wtf.
  5. Only send changes upstream if the project welcomes AI-made contributions, since nothing is sent automatically.

Prompt for your agent

Using the decomp.wtf repo (i12bp8/decomp.wtf), fork the decomp.dev project <project-name> and add my own copy of the game at <path-to-game>. Run the agents and report how many functions were matched as git commits on the decomp-wtf branch. Verify that each commit only changes C or C++ sources and headers, and that no matched function broke.

Caveat. The README warns that many decomp projects do not want AI-made contributions, and the project itself is archived with no further fixes.

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