Gemini CLI

Gemini CLI Skill

Run Google Gemini CLI (gemini) from Viber for autonomous coding and general tasks. This skill uses headless mode (gemini -p "<prompt>"), which works reliably from Node/AI SDK tool calls and web UI chat workflows.

Installation

Install Gemini CLI globally:

pnpm add -g @google/gemini-cli

Then authenticate (one of):

# Browser-based login (interactive)
gemini

# Or set API key for headless environments
export GEMINI_API_KEY=your-key-here

Tool

• gemini_run — Runs Gemini CLI with a prompt, returns:
  • summary (status, cwd, mode, exit code)
  • stdoutTail and stderrTail (chat-friendly tail output)
  • output (truncated combined output for deeper follow-up)

Why this is web-UI friendly

• Produces compact response tails so users can quickly see what happened.
• Keeps large command output bounded to protect context windows.
• Returns structured fields (ok, summary, error, exitCode, command) for robust assistant follow-up.
• Validates environment early (Gemini CLI installed, cwd exists) with clear user-facing errors.

Parameters

• prompt (required): task for Gemini
• cwd (optional): target working directory (must exist)
• waitSeconds (optional): timeout in seconds (default 120, minimum 10)
• approvalMode (optional):
  • yolo (default): --yolo — auto-approve all actions
  • default: normal interactive mode (no special flags)
• model (optional): override model (e.g. gemini-2.5-pro, gemini-2.5-flash)
• outputFormat (optional): text (default) or json for structured output

Usage from Viber

Use this skill when user intent is:

• "use gemini"
• "run gemini cli on this task"
• "delegate this to gemini"

Examples:

gemini_run({
  prompt: "Fix failing tests in src/skills/gemini-cli.test.ts",
  cwd: "/workspace/openviber",
  approvalMode: "yolo",
})

gemini_run({
  prompt: "Review this repo and suggest improvements",
  approvalMode: "default",
  waitSeconds: 180,
  model: "gemini-2.5-pro",
})

Recommended follow-up behavior in chat

After calling gemini_run:

1. Show summary first.
2. Include important lines from stdoutTail / stderrTail.
3. If failed, use error + command to explain next action.
4. Ask user whether to re-run with different approvalMode, model, or cwd.

Authentication

Gemini CLI supports multiple auth methods:

• Google account (browser login) — best for local dev
• GEMINI_API_KEY env var — best for headless/CI environments
• Google Cloud ADC — for enterprise setups

If you have a Google Ultra subscription, Gemini CLI will use your subscription's quota automatically when authenticated via Google account.

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