Professional prompt engineering tool with <XML> tagging, Markdown support, and AI-powered formatting using Claude API
<instructions> You are an expert AI assistant. ## Guidelines - Be clear and concise - Provide examples when helpful </instructions> <context> Context goes here... </context>
Transform rough notes into well-structured prompts with one click
Automatically enhance your prompts with proper XML structure and Markdown formatting. Uses Claude API with context engineering best practices built-in.
Get AI recommendations on which XML tags would benefit your prompt most. Learn best practices as you build.
Monaco-powered editor with syntax highlighting, auto-completion, and real-time XML validation
10+ pre-built tags plus custom tag creation. Insert tags with one click.
Ready-to-use templates for coding, analysis, and creative tasks
Real-time token counting with cl100k_base to optimize context usage
Save, search, and organize unlimited prompts with categories and tags
All data stored locally in your browser. No servers, no tracking
Start with a rough draft, notes, or an existing prompt. Don't worry about structure yet.
Click "✨ AI Format" for instant structure, or manually insert XML tags from the palette.
Save to your library for reuse, or export as JSON to share with your team.