general-prompt-fortifier-for-gemini3

general-prompt-fortifier-for-gemini3 is a skill for Claude Code from gpsnmeajp/ai-character-checker. It costs 49 tokens per session (7,468 once invoked), scanned A, original, CC0-1.0.

A prompt-rewriting skill specifically adapted for Gemini 3, Google’s reasoning-focused language model. It restructures general prompts for tools such as classifiers, reviewers, analysers, and agents.

In plain words
What is it for?
Use it to revise a general-purpose prompt for Gemini 3, especially when building an analyser, reviewer, classifier, or agent.
Why use it?
It targets problems the description associates with Gemini 3, including agreeing too readily, confidently answering when uncertain, and over-interpreting complicated instructions.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ai-character-checker plugin — 20 skills shipped together

Good fit Use it to revise a general-purpose prompt for Gemini 3, especially when building an analyser, reviewer, classifier, or agent.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3
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.

Any agent
npx skills add gpsnmeajp/ai-character-checker --skill general-prompt-fortifier-for-gemini3
Clone the repo
git clone --depth 1 https://github.com/gpsnmeajp/ai-character-checker

Made for: Claude Code.

Or install ai-character-checker, the plugin that ships this one along with the rest of its 20 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for general-prompt-fortifier-for-gemini3

README.md
[![agentmods](https://agentmods.dev/badge/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3/github.svg)](https://agentmods.dev/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3)
Your own site
<a href="https://agentmods.dev/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3"><img src="https://agentmods.dev/badge/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for general-prompt-fortifier-for-gemini3

Your own site · 80×15
<a href="https://agentmods.dev/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3"><img src="https://agentmods.dev/badge/skills/gpsnmeajp/ai-character-checker/general-prompt-fortifier-for-gemini3.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,468 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00049 $0.07468
Opus 5 $0.00024 $0.03734
Sonnet 5 $0.00010 $0.01494
Haiku 4.5 $0.00005 $0.00747

Measured 12d ago against content hash 6a23f46ba558, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

general-prompt-fortifier-for-gemini3 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 12d 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.

skills/general-prompt-fortifier-for-gemini3/SKILL.md · 416 lines

How it starts

The opening of the file, as written. The whole thing — 416 lines — stays where its author put it; the contents beside it link to each section on GitHub.

General Prompt Fortifier for Gemini 3

— 汎用プロンプト Gemini 3向け崩壊耐性強化スキル

概要

このスキルは、分類器・レビューツール・分析器・エージェントなど、 あらゆる汎用プロンプトを 11の強化技法 + Gemini 3固有の最適化 で再構成し、 Gemini 3(3.0/3.1)で最高の安定性と性能 を引き出すプロンプトに変換する。

general-prompt-fortifier との関係

本スキルは general-prompt-fortifier の Gemini 3特化版 である。 11の強化技法の理論的基盤は共通だが、Gemini 3の特性に合わせた適応を全面的に組み込んでいる。

項目 general-prompt-fortifier 本スキル
対象モデル SLMから推論モデルまで汎用 Gemini 3(3.0/3.1)専用
技法 11技法 11技法 + Gemini 3適応レイヤー
追従性対策 技法10で基本対策 Gemini 3の強い追従性に対する重点強化
幻覚対策 限界分離で間接対処 明示的な「不明」脱出路 + Split-Step設計
構造 XML+Markdown 同一(ただしフォーマット混在を厳格に禁止)
パラメータ 汎用推奨 temperature=1.0、thinking level推奨
エージェント対策 基本のモード分離 議論/実装分離 + 検索シミュレーション防止 + カスケード崩壊防止

汎用的なクロスモデル耐性が必要な場合は、元の general-prompt-fortifier を使用すること。

なぜGemini 3専用版が必要か

Gemini 3は「reasoning model」として設計されており、以下の特性が汎用版とは異なる対応を要求する:

  1. 追従性(Sycophancy)が極めて強い — ユーザーの期待に合わせて意見を曲げる傾向があり、マルチターンで急速にエスカレートする。判断の一貫性保全(技法10)を通常より大幅に強化する必要がある
  2. 幻覚を自信満々に生成する — RLHFの影響で「知らない」と言うのを避ける。「不確かなら『不明』と答える」を原則に組み込む必要がある
  3. 過度に複雑なプロンプトを過剰分析する — 装飾的・儀式的な文言を深読みして意図しない解釈をする。自述は直接的・簡潔に
  4. 手動CoTが逆効果 — reasoning modelなので「ステップバイステップで」は冗長。thinking levelに委ねる
  5. エージェント特有の問題 — 検索結果のシミュレーション、存在しないAPIのでっち上げ、カスケード崩壊を起こしやすい
  6. 要約での事実欠落 — 物語性を優先し、網羅性が低下する傾向

既存スキルとの関係

スキル アプローチ 本スキルとの関係
general-prompt-fortifier 汎用クロスモデル強化(11技法) 本スキルの基盤。Gemini 3固有の適応を追加した特化版
gemini3-prompt-optimizer 汎用プロンプトのGemini 3最適化 Gemini 3の特性知識・アンチパターン知識の源泉。本スキルはその知見を崩壊耐性強化に統合
character-prompt-fortifier-for-gemini3 キャラクタープロンプトのGemini 3向け強化 本スキルはキャラクター要素(口調・世界観・関係性・連鎖耐性)を除外した汎用版

理論的位置づけに関する注意

本スキルが前提とする強化技法体系は、作者独自の仮説的モデルに基づくものであり、 学術的・科学的に実証されたものではない。使用している工学的用語は概念の借用であり、 元の工学的定義とは異なる場合がある。出力結果はあくまで参考情報として扱うこと。 この旨をユーザーへの出力に含めること。

参照ファイルガイド

本スキルの SKILL.md 本体には11技法の概要・フロー・ガードレールを記載している。 11技法の理論的背景・具体的実装方法・出力プロンプトのテンプレートは参照ファイルにのみ記載されている ため、 強化の実行には参照ファイルの読み込みが不可欠である。

Read the full file on GitHub · 416 lines

Files

What ships with it

3 files 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. 12d ago First seen · 416 lines · 49 tokens per session scan A 6a23f46ba558

Subscribe to this mod's changes

general-prompt-fortifier-for-gemini3 is a skill published in the GitHub repository gpsnmeajp/ai-character-checker (5 stars, last pushed 5mo ago), licensed CC0-1.0. It adds 49 tokens to every session and 7,468 once invoked, about $0.0002 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 2026-08-31.

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