10 Must-use Slash Commands in Claude Code

Claude Code supports custom slash commands stored as Markdown files in a `.claude/commands/` directory. These commands solve two problems: repetitive retyping of long prompts and prompt drift from slight wording changes each session. Commands support dynamic arguments via `$ARGUMENTS`, live shell context injection with `!command` syntax, and optional YAML frontmatter to pre-approve tools or set model overrides. Commands are version-controlled via Git, enabling teams to share and improve prompts collaboratively. The post introduces 10 practical commands for workflows like code review, test generation, and pre-commit scanning, demonstrated on a real FastAPI/scikit-learn project.