comfyui-prompt-assembler
Modular prompt assembly nodes for ComfyUI — 8-slot, compact 4-slot, and weighted 6-slot with attention syntax
Nodes (3)
Stop hand-editing one giant prompt string — assemble it from toggleable parts
The 4-slot Prompt Assembler Compact is the one you'll actually drop into shared workflows
1.3) for you — on CLIP models. Elsewhere, careful.
ComfyUI Prompt Assembler
A set of utility nodes for ComfyUI that let you assemble prompts from multiple string inputs, each with an ON/OFF toggle to include or exclude it from the final output.
Nodes
Prompt Assembler (8 slots)
The full-featured version.
| Feature | Details |
|---|---|
| Inputs | 8 optional string inputs (prompt_1 … prompt_8) |
| Toggles | 8 boolean switches (enable_1 … enable_8), ON by default |
| Separator | comma + space, newline, space, period + space, or custom |
| Outputs | assembled_prompt (the final string) + debug_info (slot status summary) |
Prompt Assembler Compact (4 slots)
A lightweight version with 4 slots and a single string output. Great for simple workflows.
Prompt Assembler Weighted (6 slots)
Advanced version. Each slot has a weight slider (0.0-2.0). Non-1.0 weights automatically wrap the fragment in (prompt:weight) attention syntax.
| Output | Description |
|---|---|
| assembled_prompt | Weighted prompt with (text:1.30) syntax applied |
| raw_prompt | Same assembly but without weight wrappers |
Installation
Option A: ComfyUI Manager
Search for Prompt Assembler in the ComfyUI Manager and install.
Option B: manual
cd ComfyUI/custom_nodes
git clone https://github.com/jeremieLouvaert/comfyui-prompt-assembler.git
Restart ComfyUI. No pip dependencies required.
Usage example
[ String node: "a beautiful landscape" ] ──► prompt_1 enable_1: ✅ ON
[ String node: "cyberpunk style" ] ──► prompt_2 enable_2: ✅ ON
[ String node: "watercolor painting" ] ──► prompt_3 enable_3: ❌ OFF
[ String node: "8k, detailed" ] ──► prompt_4 enable_4: ✅ ON
Output (separator = comma + space):
a beautiful landscape, cyberpunk style, 8k, detailed
Slot 3 ("watercolor painting") is toggled OFF and excluded.
Tips
- Connect any STRING output to the prompt slots: text nodes, other assemblers, LLM outputs, etc.
- Unconnected slots are ignored, so you only need to wire up the ones you use.
- The debug output on the full 8-slot version is handy for troubleshooting which slots are active.
- Use the Weighted version when you want to emphasize or de-emphasize specific parts of your prompt without editing the source strings.
License
MIT