Zuckerberg Uses Claude Code CLI for Commits in Meta's Monorepo
Mark Zuckerberg made three commits to Meta's monorepo in March 2026—his first in 20 years. Tool: Claude Code CLI, a terminal AI agent from Anthropic. One of the patches racked up over 200 approvals from engineers. This comes amid delays with Llama 4 Behemoth and internal shakeups in the AI division.
Delays in Meta's Model Development
Llama 4 Behemoth was announced in spring 2025, but as of March 2026, there's still no release. The Llama 4 rollout disappointed leadership, sparking personnel changes in the AI division. The next model, codenamed Avocado, is also behind schedule.
Zuckerberg—who's poured billions into his own AI—relies on a rival's tool. Claude Code CLI plugs right into the terminal, automating dev tasks like code generation, reviews, and testing.
Trend Among CEOs: Returning to Coding with AI Agents
It's not just Zuckerberg. Tech company founders are turning to AI to dust off their programming skills:
- Garry Tan (CEO Y Combinator): after a 15-year break, built gstack—23 tools for Claude Code CLI that transform it into a full dev team. The repo is open-source.
- Tobias Lütke (CEO Shopify): testing Andrej Karpathy's AutoResearch on internal data.
The pattern: AI agents lower the entry barrier for non-active coders into the codebase. They generate diffs, handle reviews, and integrate changes.
Meta's Internal Policy on AI Assistants
Leaked docs outline the goals: by mid-2026, 65% of engineers should generate ≥75% of their code with AI. On Dwarkesh Patel's podcast, Zuckerberg predicted AI will handle ~50% of development within the next year.
The push is intensifying: mandatory AI tool use, productivity metrics tied to AI-generated code. Yet the CEO's pick of Claude Code over internal Llama tools underscores gaps in Meta's ecosystem.
Key Points:
- Zuckerberg commits via Claude Code CLI despite Llama 4 delays.
- Meta goal: 65% of engineers doing 75% AI code by mid-2026.
- CEO trend: AI agents bring founders back to coding (gstack, AutoResearch).
- Llama 4 Behemoth and Avocado unreleased as of March 2026.
- >200 approvals on the CEO's patch—a sign of team buy-in.
Prospects for AI Agents in Dev Workflows
Claude Code CLI highlights the maturity of terminal agents: parsing git repos, generating patches, automating CI/CD. For mid- and senior-level devs, it's a way to speed through grunt work—but always validate the output.
In Meta's monorepo (millions of lines of code), it manages context with RAG-like mechanisms. gstack takes it further with plugins for collaboration, debugging, and deployment.
— Editorial Team
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