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Gemini CLI in Depth

Gemini CLI is Google's open-source agentic terminal tool for coding. This deep dive covers everything a daily driver needs: the install channels, the three authentication paths (including Google's generous free tier), interactive vs. scripted -p runs, the flags that matter, slash commands, the GEMINI.md context file, wiring up MCP servers, and choosing between Flash and Pro. Every command below is copy-pasteable.