Claude Code as a Daily Driver: Claude.md, Skills, Subagents, Plugins, and MCPs

Claude Code can function as a programmable autonomous agent rather than a simple chatbot, with key improvements including plan mode for verification before execution, use of exact file references instead of descriptions, and delegating tasks rather than pair-programming. The system uses a layered configuration structure (.claude directory) with project-wide and personal settings, along with features like Skills, Subagents, and MCPs that enable custom commands, parallel workflows, and integration with external tools. Following these practices—particularly updating CLAUDE.md after mistakes to prevent repetition—can yield a 2-3x quality improvement in code output.