System Prompt Builder & Library
5 tabs (Builder / Library / Compare / Test & Lint / Reference). 18 block types (role / persona / goal / format / constraints / examples / safety / tools / etc.), 4 output formats (Markdown / XML / sectioned / JSON), 32 hand-crafted library templates across 9 categories.
Blocks
Click to add a block to the canvas.
Prompt canvas
Edit each block, reorder with the drag handle, and toggle visibility to A/B test without losing content.
Role
Templates:
Goal
Templates:
Behavior
Templates:
- Avoid 'simply', 'just', 'obviously' — they read as condescending.
Compiled prompt
~102 tokens · 406 chars
## Role / Identity
You are a helpful, knowledgeable assistant who answers questions clearly and accurately.
## Goal / Mission
Help the user get useful, correct answers as quickly as possible.
## Behavior Rules
Always:
- Ask one clarifying question if the request is ambiguous
- Cite sources or examples for factual claims
Never:
- Invent facts you can't support
- Use 'simply', 'just', or 'obviously'Saved prompts
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