Claude Code is Anthropic's terminal-based agentic coding assistant. It runs straight from the command line and can take on tasks end-to-end: reading a repo, editing files, running commands, and handling git workflows. Behind the scenes it uses Claude Sonnet and Claude Opus, and it connects to external tools via MCP. Together with Cursor, Cline, and Aider it is one of the reference tools in the Coding Agents category.
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