Anthropic accused of rebuilding Meta's Mononoke as Scion

A former Meta engineer said Anthropic's Scion version control system is a near-complete rebuild of Mononoke, which she helped design at Meta in 2018. Anthropic added a Mononoke attribution footnote only after public pressure.

• Scion handles 30,000 code merges per day from AI agents
• Anthropic credited Sapling but not Mononoke
• The Mononoke attribution footnote came after criticism
• The Hacker News post reached 230 points