🧩 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.

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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 |

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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.

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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.

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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.

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License

MIT