Claude Code: The Complete Setup Guide for macOS, Windows, and Linux

Short summary

Install Claude Code via one-liner, npm, or Homebrew on any OS; authenticate via browser or API key; then configure permissions and MCP servers. Treat it as a junior engineer—brief with context, write tests first, run tight feedback loops with verification. Common issues include corporate proxies, stale PATH entries, and Node version mismatches; restart shell and use the official installer if npm fails.

• •Cross-platform install: official one-liner, npm, or Homebrew
• •Configure permissions, hooks, and MCP servers on day one
• •Workflow: treat Claude Code as a junior engineer, not autocomplete

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