n8n is a large TypeScript monorepo implementing a self-hostable workflow automation platform. It combines a Vue-based visual editor (drag-and-drop node canvas) with a Node.js backend that executes workflows composed of pre-built integration nodes or custom JavaScript/Python code. The repository is organized as a pnpm workspace with turbo orchestration and includes hundreds of packages under packages/, most notably cli (the main server), core (execution engine), workflow (shared types), editor-ui (frontend), and nodes-base (400+ integration nodes).

The problem it solves is connecting disparate SaaS APIs, databases, and AI models without writing bespoke integration glue code. Users describe multi-step processes visually—triggers, HTTP calls, transformations, conditionals, and now AI agent steps backed by LangChain—rather than maintaining custom scripts. Recent versions heavily emphasize AI: the @n8n/n8n-nodes-langchain package integrates LLM providers (OpenAI, Anthropic, Google), vector stores, and MCP (Model Context Protocol) client/server support.

Users range from individual developers running `npx n8n` locally, to teams self-hosting via Docker, to enterprises on n8n Cloud. Typical usage: define a trigger (webhook, cron, event), chain integration nodes, optionally embed JS/Python code or an AI agent, then deploy. Enterprise features (SSO, RBAC, audit logs) live under a separate EE license.

Architecturally, the CLI package boots an Express server backed by TypeORM (SQLite/Postgres), queues jobs (BullMQ-style workers), and exposes a REST API consumed by the Vue editor. The core package handles node execution, credentials, and binary data (with S3/Azure Blob support). A task-runner subprocess isolates user code execution. The build system uses turbo, biome, and vitest; heavy tooling includes SBOM generation, license compliance checks, and extensive Claude/agent skill definitions in .agents and .claude directories.

Notable observations: the codebase is unusually mature and well-instrumented (Sentry, code-health baselines, mutation testing, telemetry). Licensing is 'fair-code' via the Sustainable Use License plus a separate Enterprise License—source-available but not OSI open source. The .claude/plugins and .agents/skills directories indicate deep internal use of AI coding assistants for development workflow.