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Gemini CLI Config Generator

Generate a settings.json and GEMINI.md for Google’s Gemini CLI — model, theme, sandbox, fallback, and MCP servers, with an optional private in-browser AI context writer.

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No data is sent to any server. All processing happens locally on your device.

Generate a Gemini CLI settings.json

Google’s Gemini CLI reads ~/.gemini/settings.json (JSON) plus a GEMINI.md project context file. This tool builds both, with copy and download buttons.

Install Gemini CLI

npm install -g @google/gemini-cli

Then set your key: export GEMINI_API_KEY="your-aistudio-key" (from Google AI Studio). The key is read from the environment, not stored in settings.json.

What settings.json controls

  • model — default model such as gemini-2.5-pro or gemini-2.5-flash.
  • theme — dark, light, or auto.
  • fallbackEnabled — drop to Flash when Pro limits are hit.
  • sandbox — run tools in a Docker/Podman sandbox.
  • mcpServers — connect MCP servers (Filesystem, GitHub, Context7, Playwright).

GEMINI.md

Place GEMINI.md in your project root for shared context. The optional in-browser AI writes a tailored one from a plain-English project description — entirely on your device via WebGPU. GEMINI.md and settings.json remain supported under Antigravity, the successor to the Gemini CLI.

FAQ

Where does the API key go?

In the GEMINI_API_KEY environment variable (or ~/.gemini/.env), not in settings.json.

Is the Gemini CLI being replaced?

Google is migrating users to Antigravity (the agy CLI). These settings.json and GEMINI.md files carry over.

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Generate a Gemini CLI settings.json

Google’s Gemini CLI reads ~/.gemini/settings.json (JSON) plus a GEMINI.md project context file. This tool builds both, with copy and download buttons.

Install Gemini CLI

npm install -g @google/gemini-cli

Then set your key: export GEMINI_API_KEY="your-aistudio-key" (from Google AI Studio). The key is read from the environment, not stored in settings.json.

What settings.json controls

  • model — default model such as gemini-2.5-pro or gemini-2.5-flash.
  • theme — dark, light, or auto.
  • fallbackEnabled — drop to Flash when Pro limits are hit.
  • sandbox — run tools in a Docker/Podman sandbox.
  • mcpServers — connect MCP servers (Filesystem, GitHub, Context7, Playwright).

GEMINI.md

Place GEMINI.md in your project root for shared context. The optional in-browser AI writes a tailored one from a plain-English project description — entirely on your device via WebGPU. GEMINI.md and settings.json remain supported under Antigravity, the successor to the Gemini CLI.

FAQ

Where does the API key go?

In the GEMINI_API_KEY environment variable (or ~/.gemini/.env), not in settings.json.

Is the Gemini CLI being replaced?

Google is migrating users to Antigravity (the agy CLI). These settings.json and GEMINI.md files carry over.

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ℹ️ Disclaimer

This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.