19.7K-star, #1-trending GitHub Claude Code playbook from Anthropic insiders. 84 battle-tested tactics: Command→Agent→Skill orchestration, parallel agent teams with tmux + git worktrees, the Ralph Wiggum autonomous-loop pattern, cross-model workflows (Claude reviewing Codex output), Opus-plans → Sonnet-executes splits, agentic search over RAG, spawn-subagents-don't-compress-context.
Discovered on Twitter via @Shruti_0810