What Is Claude Code? The Most Complete Guide for 2026: CLI Installation, Desktop App, Routines Automation, MCP, and a Full Breakdown of the .claude Permission Structure
Claude Code is an AI coding platform launched by Anthropic in 2024 and matured in 2026. Unlike completion-based tools (GitHub Copilot) or chat-window-style tools (Claude.ai), Claude Code lets AI agents directly operate your terminal, file system, Git, and external APIs to complete multi-step engineering tasks. Starting in April 2026, Claude Code enters a “systematized” phase—desktop redesign, cloud Routines scheduling went live, and the .claude folder becoming the standard structure for permissions and skills. This article covers everything in one go, from installation and interface to permissions and hands-on practice.
Claude Code Core Positioning
Claude Code’s design philosophy is “A
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