Gemini Skill Guide

When to Use Gemini

• WHEN ASKED TO BE ACTIVATED
• Code Review: Comprehensive code reviews across multiple files
• Plan Review: Analyzing architectural plans, technical specifications, or project roadmaps
• Big Context Processing: Tasks requiring >200k tokens of context (entire codebases, documentation sets)
• Multi-file Analysis: Understanding relationships and patterns across many files

⚠️ Critical: Background/Non-Interactive Mode Warning

NEVER use --approval-mode default in background or non-interactive shells (like Claude Code tool calls). It will hang indefinitely waiting for approval prompts that cannot be provided.

For automated/background reviews:

• ✅ Use --approval-mode yolo for fully automated execution
• ✅ OR wrap with timeout: timeout 300 gemini ...
• ❌ NEVER use --approval-mode default without interactive terminal

Symptoms of hung Gemini:

• Process running 20+ minutes with 0% CPU usage
• No network activity
• Process state shows 'S' (sleeping)

Fix hung process:

# Check if hung
ps aux | grep gemini | grep -v grep

# Kill if necessary
pkill -9 -f "gemini.*gemini-3-pro-preview"

Running a Task

1. Ask the user (via AskUserQuestion) which model to use in a single prompt. Available models:
   • gemini-3-pro-preview ⭐ (flagship model, best for coding & complex reasoning, 35% better at software engineering than 2.5 Pro)
   • gemini-3-flash (sub-second latency, distilled from 3 Pro, best for speed-critical tasks)
   • gemini-2.5-pro (legacy option, strong all-around performance)
   • gemini-2.5-flash (legacy option, cost-efficient with thinking capabilities)
   • gemini-2.5-flash-lite (legacy option, fastest processing)