Claude Code

Anthropic's terminal-based agentic coding tool launched in early 2025 alongside Claude 3.7 Sonnet. It accepts natural-language commands in the shell and autonomously performs multi-step coding tasks including file editing, git operations, test execution, and large-scale refactoring using a 200K token context window. Claude Code can be extended with hooks, MCP servers, and custom slash commands for project-specific workflows.