ComfyUI Prompt Library

A collection of ComfyUI nodes for efficient prompt management and organization. Handle multi-line prompts with positive/negative separation, create prompt libraries, and extend prompts dynamically.

Features

• Double Prompt Format: All nodes use a unified format where positive and negative prompts are separated by --- (3-5 dashes)
• Prompt Libraries: Organize prompts in text files or directly in nodes
• Smart Concatenation: Intelligently combines prompts with proper punctuation
• Comment Support: Use ### at line start for notes that won't be processed

Nodes

🔤 Simple Prompt Library

Store multiple prompt projects directly in a text field within ComfyUI.

• Projects: Each project is separated by empty lines
• Index: Select which project to use (1, 2, 3, etc.)
• Randomize: Randomly select a project
• Global Prompt: When enabled, the first project is automatically added to all other projects

Example:

### Global settings (Project 1)
masterpiece, best quality
---
worst quality, ugly

### Portrait style (Project 2)
portrait photo, face focus
---
full body, cropped head

### Landscape style (Project 3)
scenic landscape, wide angle
---
people, portraits

📁 Prompt Library

File-based prompt management that reads .txt files containing complete scene descriptions.

Setup:

1. Navigate to ComfyUI/models/prompts/
2. Create folders for different themes/projects (e.g., fantasy_rpg, cyberpunk_scenes, nature_photography)
3. Add .txt files with complete scene descriptions
4. Files appear in the dropdown as folder/filename

File Structure Example:

ComfyUI/models/prompts/
├── fantasy_rpg/
│   ├── dungeon_exploration.txt
│   ├── tavern_scene.txt
│   └── boss_battle.txt
├── cyberpunk_scenes/
│   ├── neon_street.txt
│   └── hacker_hideout.txt
└── nature_photography/
    ├── mountain_sunrise.txt
    └── forest_creek.txt

Inside dungeon_exploration.txt:

### Dark Corridor (Project 1)
ancient stone corridor, torchlight, moss covered walls, dripping water, medieval dungeon
---
modern elements, bright lighting, clean surfaces

### Treasure Room (Project 2)
golden treasures, ancient artifacts, mystical glow, dust particles in light rays
---
empty room, poor, modern items

### Monster Encounter (Project 3)
massive stone chamber, lurking shadows, glowing eyes in darkness, battle ready stance
---
peaceful, well lit, safe environment

• Each file contains multiple scene variations (projects)
• Projects are separated by empty lines
• Use the index parameter to select which scene variation to use

➕ Prompt Extender

Add extensions to existing prompts from other nodes.

• Input: Connect a double prompt from another node
• Additions: Define what to add in the text field
• Output: Combined result maintaining the double prompt format

Usage Example:

1. Connect Simple Prompt Library output → Prompt Extender input
2. Add extensions like:

   dramatic lighting, fog atmosphere
   ---
   flat lighting, clear visibility
   

3. Result: Original prompts + your additions

🎨 Double Prompt Encode

Convert double prompt text directly to CLIP conditioning.

• Input: Any text using the --- separator format
• Output: Separate positive and negative conditioning outputs
• Perfect for connecting prompt libraries directly to samplers

Double Prompt Syntax

All nodes use this unified format:

positive prompt content here
---
negative prompt content here

• Everything above --- → Positive prompt
• Everything below --- → Negative prompt
• No separator → Everything becomes positive prompt
• Separator must be on its own line (3-5 dashes: ---, ----, or -----)

Workflow Examples

Scene-Based Workflow

1. Create a ComfyUI/models/prompts/game_art/character_portraits.txt file
2. Add multiple character descriptions separated by empty lines
3. In ComfyUI: Prompt Library → set to game_art/character_portraits → choose index → Double Prompt Encode → Sampler

Modular Prompt Building

1. Simple Prompt Library (base quality settings)
2. → Prompt Extender (add environmental details)
3. → Prompt Extender (add mood/atmosphere)
4. → Double Prompt Encode → Sampler

Global Prompt Example

With Simple Prompt Library:

• Project 1: 8k, professional photography --- lowres, amateur
• Project 2: warrior in armor --- modern clothing
• Result when using index 2: 8k, professional photography, warrior in armor --- lowres, amateur, modern clothing

Tips

• Comments: Lines starting with ### are ignored - perfect for notes
• Complete Scenes: Each project should be a complete scene description, not just keywords
• Organization: Name folders and files descriptively for your actual projects
• Testing: Use randomize to cycle through different scene variations
• Chaining: Connect multiple Prompt Extenders to layer details onto base scenes

Installation

1. Clone to ComfyUI/custom_nodes/
2. Restart ComfyUI
3. Find nodes under "hexxacubic" category