Install


npm install -g @anthropic-ai/claude-code

Authenticate

API key — add to your shell profile:


export ANTHROPIC_API_KEY="sk-ant-..."

Claude Pro / Max — skip the key. Run claude once and log in via the browser prompt.

Press ⌘+⌥+3 or open the Command Palette → Add Claude Code.

A dedicated tab opens and Claude Code is ready.

Terminal

$ claude
Welcome to Claude Code v1.0
 
$ Add input validation to the login form
✓ Modified src/login.tsx
✓ Modified src/validators.ts
$ 

Review changes in the Diff tab, then commit with ⌘+⇧+K.

Permission modes

Mode	Behavior
`ignore` (default)	Runs with `--dangerously-skip-permissions` — all actions auto-accepted.
`approve`	Prompts before each file write or shell command.

ignore is safe because every session runs in its own isolated worktree.

Session continuation

Pane automatically passes --resume with the stored session ID when you reopen a Claude Code tab. No manual steps needed.