Claude Code is Anthropic's agentic AI coding tool that lives in your terminal and works autonomously across your entire codebase. Launched in early 2026 and rapidly adopted by professional developers, it reads your complete project, writes and edits files across multiple directories, runs shell commands, executes tests, and creates pull requests — all from a single natural-language instruction. Available as a CLI tool, VS Code extension, JetBrains plugin, and a redesigned desktop app (released April 14, 2026), Claude Code integrates seamlessly into existing workflows. The April 2026 desktop redesign introduced an integrated terminal, faster diff viewer, in-app file editor, and drag-and-drop layout. The same release shipped Routines (research preview) — saved Claude Code configurations that run on a schedule, from an API call, or in response to an event like a GitHub push, all on Anthropic's cloud infrastructure. A multi-agent code review feature for Team and Enterprise plans dispatches five specialized agents to analyze pull requests in parallel. Claude Code is powered by Claude Sonnet 4.6 and Opus 4.6, with a 1M-token context window enabling full-codebase awareness. The tool is estimated to generate $2.5 billion in annualized revenue as of March 2026, and 'claude code' searches hit 1 million per month — a sign of mainstream developer adoption.