I Reverse-engineered Claude Code's Pet Buddy, Its open-source!

There's a companion feature buried in Claude Code behind a compile-time flag called BUDDY. A little ASCII creature sits beside your terminal input and occasionally talks in a speech bubble. 18 species, 5 rarities, hats, shiny variants, stat bars. Full gacha system. The catch: your companion is permanently locked to your Anthropic account. Your UUID gets hashed, seeded into a PRNG, and the same roll plays out every time. No rerolls. If you got a common duck, that's your common duck forever. The tamper protection is a single JavaScript spread operation.