System Prompt Library
Runs in browser15+ system prompts for GPT-4, Claude, and Gemini — filter, search, and copy.
Browse 15 ready-to-use system prompts for coding, writing, data analysis, and productivity. Filter by category, search by keyword, and copy the full prompt in one click.
System Prompt Library tool
API Documentation Writer
Write OpenAPI-compliant REST API documentation with examples and schemas.
Senior Code Reviewer
TypeScript-focused code review with actionable feedback on patterns, security, and performance.
SQL Expert & Query Explainer
Write, optimize, and explain SQL queries with execution plan analysis.
Technical Documentation Writer
Write clear, structured technical docs, READMEs, and API references.
Regex Generator & Explainer
Generate and explain regular expressions with test cases and edge case handling.
Data Analyst
Analyze CSV/JSON data, identify patterns, and generate insights with Python/SQL.
API Documentation Writer
Write OpenAPI-compliant REST API documentation with examples and schemas.
Git Commit Message Writer
Write conventional commit messages from diffs or descriptions.
PR Description Writer
Write comprehensive pull request descriptions with context, testing notes, and screenshots guidance.
Bug Report Analyzer
Analyze bug reports to identify root causes, reproduction steps, and fixes.
Security Code Auditor
Audit code for OWASP Top 10 vulnerabilities, secrets exposure, and security antipatterns.
Performance Optimization Advisor
Identify and fix performance bottlenecks in code, queries, and architecture.
Database Schema Designer
Design normalized database schemas with indexes, constraints, and migration scripts.
Test Case Generator
Generate comprehensive unit, integration, and edge-case tests.
Technical Interviewer (Coding)
Conduct structured coding interviews with hints, follow-up questions, and scoring rubric.
System Design Interviewer
Lead system design interviews covering scalability, reliability, and trade-off analysis.
Submit your prompt
🔒 Runs in your browser · No uploads · Your data never leaves your device
How to use
Browse or search
Use the search bar to find prompts by keyword, or click a category chip (Coding, Writing, Analysis, etc.) to filter.
Open a prompt
Click any card to open the full prompt in a modal. The full system prompt text is shown with model compatibility badges.
Copy and use
Click 'Copy prompt' to copy the full text. Paste it into the System Prompt field in ChatGPT, Claude, or your API call.
Common use cases
- Bootstrapping AI personas quickly — Browse and copy a battle-tested system prompt instead of writing one from scratch for common use cases.
- Learning prompt engineering patterns — Study existing prompts to understand how role, constraints, and output format are structured for different tasks.
Examples
Code review prompt
Senior code reviewer prompt: TypeScript focus, security checks, SOLID principles
Output~156 token system prompt for GPT-4o and Claude
Frequently asked questions
- What is a system prompt?
- A system prompt is an instruction given to an AI at the start of a conversation that shapes its behavior, persona, and output style throughout the session. It's the key to getting consistent, high-quality AI responses.
- Which AI models support system prompts?
- GPT-4o and GPT-4 support them via the 'system' role in the Messages API. Claude supports them via the system parameter. Gemini supports them via systemInstruction. Most modern LLMs have equivalent functionality.
- Can I customize these prompts?
- Yes — after copying, you can edit the prompt to fit your specific needs. The prompts are starting points, not final answers.
Key concepts
- System prompt
- An instruction sent to an LLM at conversation start that sets behavior, tone, and constraints for the entire session.
- Persona
- A defined role and personality assigned to an AI via the system prompt (e.g., 'You are a senior DevOps engineer').
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