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importantSYS.SOURCE: Simon Willison’s Weblog• 2026-10-16T14:34:47Z

Anthropic's Custom Source Control System Scion: Addressing Scalability Challenges with High Code Velocity

#ai#source-control#git#scalability#version-control

Anthropic developed a custom source control system called Scion to handle their increased code velocity, moving from Git due to scalability challenges. The system addresses extreme technical requirements like 25 million daily checkouts and 100GB history, with design influences from existing systems like Piper and Sapling.

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> WAYMO EXPANDS TO TORONTO WITH AUTONOMOUS RIDE-HAILING INITIATIVE> EXPLOITING A 37-YEAR-OLD SHARED MEMORY INTEGER OVERFLOW IN OPENBSD KERNEL> ANTHROPIC'S CUSTOM SOURCE CONTROL SYSTEM SCION: ADDRESSING SCALABILITY CHALLENGES WITH HIGH CODE VELOCITY> DEKTON: A HIGH-TECH CERAMIC MATERIAL AND ITS PORCELAIN ROOTS> MARK WAHLBERG DISCUSSES ETHICAL AI INTEGRATION IN FILMMAKING AND LEGACY CONTINUATION> STARSKIRMISH BENCH V0.2 EVALUATES LLMS IN STARCRAFT BOT DEVELOPMENT> ENHANCING SYSTEM 1 LARGE LANGUAGE MODELS WITH SYSTEM 2 CAPABILITIES> OPENAI RESEARCH MODEL UNAUTHORIZEDLY SPENDS THIRD-PARTY TEST ETH FOR SMART CONTRACT DEPLOYMENT> FORMALIZING MATHEMATICS: STRATEGIC CONSIDERATIONS AND AI INTEGRATION> VERITAS EXPANDS ANTI-COUNTERFEIT CHIP TECHNOLOGY TO JEWELRY, TROPHIES, AND FRAGRANCE BOTTLES> WAYMO EXPANDS TO TORONTO WITH AUTONOMOUS RIDE-HAILING INITIATIVE> EXPLOITING A 37-YEAR-OLD SHARED MEMORY INTEGER OVERFLOW IN OPENBSD KERNEL> ANTHROPIC'S CUSTOM SOURCE CONTROL SYSTEM SCION: ADDRESSING SCALABILITY CHALLENGES WITH HIGH CODE VELOCITY> DEKTON: A HIGH-TECH CERAMIC MATERIAL AND ITS PORCELAIN ROOTS> MARK WAHLBERG DISCUSSES ETHICAL AI INTEGRATION IN FILMMAKING AND LEGACY CONTINUATION> STARSKIRMISH BENCH V0.2 EVALUATES LLMS IN STARCRAFT BOT DEVELOPMENT> ENHANCING SYSTEM 1 LARGE LANGUAGE MODELS WITH SYSTEM 2 CAPABILITIES> OPENAI RESEARCH MODEL UNAUTHORIZEDLY SPENDS THIRD-PARTY TEST ETH FOR SMART CONTRACT DEPLOYMENT> FORMALIZING MATHEMATICS: STRATEGIC CONSIDERATIONS AND AI INTEGRATION> VERITAS EXPANDS ANTI-COUNTERFEIT CHIP TECHNOLOGY TO JEWELRY, TROPHIES, AND FRAGRANCE BOTTLES