What Is Claude Code? The Terminal Agent and Its Extension Model

Claude Code is Anthropic’s agentic coding tool that operates through terminals and other interfaces to read repositories, edit files, execute commands, and verify changes, with users generally directing goals while the agent handles implementation decisions. Its behavior can be customized through repository- or user-level extension layers: CLAUDE.md files provide persistent instructions, skills supply reusable on-demand procedures, subagents isolate lengthy investigations, MCP servers connect external tools and services, hooks enforce deterministic actions at lifecycle events, and plugins package these components for sharing. The platform uses permission modes and optional operating-system sandboxing to govern file, shell, and network access, with support varying by operating system. The article emphasizes selecting extensions based on whether a team needs standing context, a procedure, external capability, isolation, or mandatory enforcement, particularly noting that hooks provide stronger guarantees than written instructions. It also argues that passing agent-run tests does not independently establish browser, device, visual, or nondeterministic behavior, promoting external verification tools such as TestMu AI and its Kane CLI for real-browser and device testing within a QA workflow.

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