gemini

A skill for running the Gemini command-line tool to review code, examine plans, or process very large amounts of project material. Gemini is another AI model, and a command-line tool is a program controlled through a terminal.

In plain words
What is it for?
Use it for multi-file code reviews, architecture or plan reviews, and projects or document sets containing more than 200,000 tokens.
Why use it?
It helps with reviews and analysis that span many files or exceed the context size of a typical request.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/softaworks/agent-toolkit/gemini
Any agent
npx skills add softaworks/agent-toolkit --skill gemini
Clone the repo
git clone --depth 1 https://github.com/softaworks/agent-toolkit

Made for: Claude Code, Codex.

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,510 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00053 $0.02510
Opus 5 $0.00026 $0.01255
Sonnet 5 $0.00011 $0.00502
Haiku 4.5 $0.00005 $0.00251

Measured 2d ago against content hash bc9c52aafed2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gemini scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • gemini — 95% identical, 15 lines differ
skills/gemini/SKILL.md · 224 lines

How it starts

The opening of the file, as written. The whole thing — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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)
  2. Select the approval mode based on the task:

    • default: Prompt for approval (⚠️ ONLY for interactive terminal sessions)
    • auto_edit: Auto-approve edit tools only (for code reviews with suggestions)
    • yolo: Auto-approve all tools (✅ REQUIRED for background/automated tasks)

Read the full file on GitHub · 224 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 224 lines · 53 tokens per session scan A bc9c52aafed2

Subscribe to this mod's changes

gemini is a skill published in the GitHub repository softaworks/agent-toolkit (2,413 stars, last pushed 6mo ago), licensed MIT. It adds 53 tokens to every session and 2,510 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.