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
• Flexible Prepend/Append: Add global settings before or after your prompts

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: Enable to randomly select a different project on each generation
• Output: Combined double prompt string and the used index

Organizing Multiple Projects: You can store many different prompt variations or completely different scenes in one text field. Use ### comments to number and label them for easy reference:

### 1 - Quality Base
masterpiece, best quality
---
worst quality, ugly

### 2 - Fantasy Portrait
portrait of an elf warrior, detailed armor, forest background
---
modern clothing, urban setting

### 3 - Sci-Fi Scene
futuristic cityscape, neon lights, flying vehicles
---
medieval, rustic, old fashioned

### 4 - Nature Photography
misty mountain sunrise, dramatic clouds
---

### 5 - Abstract Art
flowing colors, geometric patterns, surreal composition
---
realistic, photographic, literal

Index Selection: Set the index to 3 to use the "Sci-Fi Scene" project. The index directly corresponds to the project number (separated by empty lines).

Random Mode: Enable randomize_index to randomly pick between all available projects on each generation - perfect for exploring variations or creating diverse outputs.

📁 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    # Multiple dungeon variations
│   ├── tavern_scene.txt          # Different tavern scenarios
│   └── boss_battle.txt           # Various boss encounters
├── cyberpunk_scenes/
│   ├── neon_street.txt           # Street scene variations
│   └── hacker_hideout.txt        # Different hideout styles
└── nature_photography/
    ├── mountain_sunrise.txt       # Various mountain scenes
    └── forest_creek.txt          # Different forest moods

Inside dungeon_exploration.txt:

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

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

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

### 4 - Puzzle Chamber
intricate mechanisms, mysterious symbols, blue magical energy
---

### 5 - Boss Arena
vast ceremonial hall, pillars of obsidian, lava flows, epic scale
---
small room, cramped space

Key Features:

• Multiple Variations: Each file can contain dozens of different scenes or variations
• Mixed Content: Combine related variations (different dungeon rooms) or completely different concepts in one file
• Index Selection: Use the index parameter to select specific scenes (e.g., index 4 = Puzzle Chamber)
• Random Mode: Enable randomize_index to randomly select from all projects in the file
• Numbered Comments: Use ### 1 - Name format to easily identify which index corresponds to which project
• Empty Negatives: Leave negative prompts empty by having nothing after --- (as shown in project 4)

➕ Prompt Extender

Add extensions to existing prompts from other nodes with flexible positioning.

• Input: Connect a double prompt from another node
• Additions: Define what to add in the text field
• Prepend Mode: Toggle to add extensions before (ON) or after (OFF) the input prompt
• Output: Combined result maintaining the double prompt format

Usage Example:

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

   8k, professional photography
   ---
   lowres, amateur
   

3. With Prepend Mode OFF (default): Original + additions
4. With Prepend Mode ON: Additions + original (useful for global quality settings)

🎨 Double Prompt Encode

Convert double prompt text directly to CLIP conditioning.

• Input: Any text using the --- separator format (requires connection from another node)
• 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
• Empty negative allowed: Leave blank after --- for no negative prompt
• Separator must be on its own line (3-5 dashes: ---, ----, or -----)

Valid Examples:

# Full double prompt:
beautiful landscape, sunset
---
ugly, blurry

# Only positive prompt:
beautiful landscape, sunset

# Empty negative prompt:
beautiful landscape, sunset
---

# Even this works (only negative):
---
ugly, blurry

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 → choose file and index → Double Prompt Encode → Sampler

Modular Prompt Building with Global Settings

1. Simple Prompt Library (character/scene descriptions)
2. → Prompt Extender with Prepend Mode ON (add quality settings at the beginning)
3. → Prompt Extender with Prepend Mode OFF (add style details at the end)
4. → Double Prompt Encode → Sampler

Global Settings Example

1. Simple Prompt Library: warrior in armor --- modern clothing
2. Prompt Extender (Prepend ON): 8k, professional photography --- lowres, amateur
3. Result: 8k, professional photography, warrior in armor --- lowres, amateur, modern clothing

Tips

• Comments: Lines starting with ### are ignored - perfect for notes and numbering projects
• Project Numbering: Use ### 1 - Project Name format to keep track of which index selects which prompt
• Organization:
  • One file can contain many variations of similar scenes
  • Or mix completely different concepts in one file
• Random Exploration: Use randomize_index to:
  • Use all variations automatically
  • Create diverse output sets
  • Find unexpected combinations
• Empty Negatives: Sometimes you don't need negative prompts - just leave the space after --- empty
• Prepend for Quality: Use Prompt Extender with Prepend Mode ON to add consistent quality settings to all prompts
• 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