Gemini CLI Skill Use Google’s gemini CLI as an external “second brain” when you need a very large context window, a second opinion, or safe sandbox execution. This skill does not use MCP; it runs the local CLI directly. When To Use Use this skill when the user asks to: “Ask Gemini” / “Use Gemini” Analyze or summarize large files or directories (especially with @path references) Brainstorm options with a specific framework (SCAMPER, design thinking, etc.) Generate structured edit suggestions (“change mode”) that can be applied deterministically Prerequisites gemini CLI is installed and configured (e.g. gemini --version works) You are allowed to run local shell commands in this environment For sandbox execution, Gemini CLI supports -s/--sandbox (see gemini --help ) Core Commands One-shot query (plain) gemini "Explain what this code does: @src/main.ts" Choose a model gemini -m gemini-3-pro-preview "..." gemini -m gemini-3-flash-preview "..." Sandbox mode gemini -s "Safely test @scripts/example.py and explain the results." Helper Script (Recommended) This skill ships with a dependency-free wrapper that mirrors the core behavior of gemini-mcp-tool without MCP: skills/gemini-cli/scripts/gemini-tool.mjs Important: Gemini CLI can only read files under its current “project directory” (typically the process working directory). Run the wrapper from the repo you want Gemini to read, or pass --cwd . node skills/gemini-cli/scripts/gemini-tool.mjs help Ask Gemini (wrapper) node skills/gemini-cli/scripts/gemini-tool.mjs ask --prompt "Summarize @. in 5 bullets." node skills/gemini-cli/scripts/gemini-tool.mjs ask --cwd /path/to/project --prompt "Summarize @. in 5 bullets." node skills/gemini-cli/scripts/gemini-tool.mjs ask --prompt "..." --model gemini-3-pro-preview node skills/gemini-cli/scripts/gemini-tool.mjs ask --prompt "..." --sandbox Brainstorm (wrapper) node skills/gemini-cli/scripts/gemini-tool.mjs brainstorm --prompt "How should we design onboarding?" --methodology scamper --ideaCount 12 Change Mode (structured edits + chunk caching) Use change mode when you want Gemini to output deterministic OLD/NEW blocks that can be applied by exact string matching. node skills/gemini-cli/scripts/gemini-tool.mjs ask --changeMode --prompt "In @src/foo.ts, rename Foo to Bar and update call sites." If the response is chunked, the output includes a cacheKey . Fetch the next chunk: node skills/gemini-cli/scripts/gemini-tool.mjs fetch-chunk --cacheKey < key
--chunkIndex 2 Safety Rules Never execute destructive commands from Gemini output without explicit user approval. In change mode, the OLD block must match the file content exactly ; otherwise, do not apply the edit. Prefer read-only analysis unless the user explicitly requests changes.