oh-my-openagent (omo) is a massive, actively-developed TypeScript monorepo that ships as a multi-harness AI-agent orchestration plugin. Its production function is to instrument coding-agent runtimes (OpenCode, OpenAI Codex CLI, and adapters for Claude Code and other harnesses) with a rich layer of lifecycle hooks, background agents, multi-model routing, LSP/AST tooling, team-mode parallelism, and a curated prompt system — all installable via a single `bunx oh-my-openagent install` or `npx lazycodex-ai install` command. The architecture is a workspace of 20+ pure-TypeScript core packages (model-core, rules-engine, skills-loader-core, team-core, tmux-core, delegate-core, hashline-core, lsp-core, mcp-client-core, etc.) that are consumed by two main adapter packages: `omo-opencode` (the full-featured OpenCode plugin with 11 agents, 54+ hooks, team mode, ultrawork/ULW loop, background agents, Codegraph MCP, etc.) and `omo-codex` (a lightweight Codex CLI plugin that vendories a subset of components — rules, comment-checker, LSP, git-bash, ultrawork, ulw-loop, telemetry — as isolated Codex components). A large shared-skills layer provides cross-harness SKILL.md files for programming languages, frontend design, ultimate browsing, debugging, and more. The codebase is notable for its aggressive package layering refactor (documented in ROADMAP.md), its strict no-excuse TypeScript policy, extensive automated QA evidence (.omo/evidence/), and its depth of agent-facing features like hash-anchored edits, prompt-async-gate, runtime fallback with model-suggestion retry, and the start-work/ULW-loop goal orchestration systems. With 64K stars, daily commits, 790 open issues, and a sprawling CI matrix, it is one of the most ambitious open-source agent-orchestration projects in maintenance today.