Mods in Claude Code: change how Claude Code works

Claude Code now supports mods: functions you write that change what Claude Code renders, what goes into a prompt, and what tool calls it makes. Lydia from Anthropic shows three she built. A live context breakdown, an agent side pane, and hover-to-reveal email addresses, then builds the email one from scratch. Learn more about mods: https://claude.dev/blog/getting-started-with-claude-code-mods/