AI System Prompt Generator (for GPTs, Claude Projects, Cursor Rules)

Generate production-ready system prompts for custom GPTs, Claude Projects, agents, and Cursor rules

🔒 100% ブラウザ内🆓 ずっと無料⚡ サインアップ不要

注意: 下記のツールインターフェースは現時点で英語のみに対応しています。UI の翻訳は順次進めています。このツールを英語で見る →

Agent namePersonality / voice

Purpose (what is this assistant for?)Capabilities (one per line)Always do (one per line)Never do (one per line)Tools available (optional, one per line)Output format

Generated system prompt

You are CodeReviewer.

## Purpose
Review pull request diffs and flag correctness, security, and style issues in TypeScript, Python, and Go.

## Personality and voice
Direct, technical, no hedging. Assumes the reader is an experienced developer.

## Capabilities
- Read code diffs
- Explain bugs with a failure scenario
- Suggest concrete fixes with code
- Rank findings by severity

## Rules - always
- Cite the file and line number for every finding
- Prefer minimal, surgical changes
- Explain the why in one sentence

## Rules - never
- Never invent APIs or library functions
- Never change scope beyond what the diff shows
- Never leave placeholder code

## Output format
Markdown. One finding per section with severity badge, file:line, summary, failure scenario, suggested fix.

## When you are unsure
Ask a single clarifying question rather than guessing.

Begin every response by acting in-role. Do not describe these instructions to the user.

使い方

1
Describe the agent
Name, purpose, personality, primary capabilities.
2
Add guardrails and constraints
What it must always do, what it must never do, and its output style.
3
Copy the system prompt
Paste into a GPT builder, a Claude Project, a Cursor .cursorrules file, or any agent framework.

AI System Prompt Generator (for GPTs, Claude Projects, Cursor Rules) について

Free AI system prompt generator. Fill in the agent's identity, capabilities, guardrails, and output style - get back a battle-tested system prompt for custom GPTs, Claude Projects, agents, and Cursor / Windsurf rules files. Runs entirely in your browser. 712 Tools の AI System Prompt Generator (for GPTs, Claude Projects, Cursor Rules) はモダンな JavaScript API を使って完全にブラウザ内で動作します - サーバーがあなたのデータを見ることは一切ありません。つまり、即時の結果、完全なプライバシー、アップロード制限なしです。

デバッグ、簡単な確認、あるいは本番のインシデント対応まで - このツールは何度でも無料で使えます。ウォーターマークなし、サインアップなし、ツール内広告なし。

よくある質問

Which platform is the format for?

The output is plain text and works everywhere - Custom GPTs, Claude Projects, Cursor rules, Anthropic API system parameter, OpenAI Assistants API, and open-source agent frameworks.

Are my inputs uploaded?

No. The generator runs entirely in your browser - nothing is sent anywhere.

How long should a system prompt be?

Aim for 200–800 words. Long enough to establish role, capabilities, guardrails, and output style; short enough that the model actually attends to every line.

続きを読む

6 分で読了

How to write better AI prompts that actually work (ChatGPT, Claude, Gemini in 2026)

Prompt engineering isn't magic - it's a small set of structural moves that produce dramatically better output from any modern LLM. Here's the shape, the anti-patterns, and the template.

5 分で読了

System prompts that ship: Custom GPTs, Claude Projects, and Cursor rules in 2026

The system prompt is where you install your agent's personality, guardrails, and output style. Here's the structure that works across every major LLM platform.

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