KIE System Prompt Selector

If you use an LLM inside your ComfyUI workflows - and the pack's own grid workflow does, to turn an input image into prompt variations - you will eventually find yourself pasting the same long system prompt into node after node. This helper is the antidote: it keeps your system prompts as plain .txt files on disk and gives you a dropdown to pick one, then merges it with your user prompt into a single output string.

The value is organizational, not magical. Instead of system-prompt text buried in a thousand-node workflow JSON (which then breaks every time you edit it and re-export), your prompt library lives in the pack's prompts/ folder, survives workflow exports untouched, and is swap-in/swap-out from a dropdown. If you've ever spent twenty minutes un-nesting a prompt that got mangled through workflow JSON round-trips, that alone justifies the node.

How it works

The dropdown (system_template) is populated by scanning two folders:

• prompts/images/*.txt
• prompts/videos/*.txt

Each template file must follow a strict format for the node to pick it up:

name: Character Consistency v1
system prompt below
You are a helpful assistant. Always preserve the character's identity.
When the user says: {user_prompt}
Return concise instructions for image generation.

The name: line becomes the dropdown label; the system prompt below line marks where the body starts; and the optional {user_prompt} placeholder is where your prompt gets injected. If a file is missing either marker, it's silently ignored - so a typo'd template just won't appear in the dropdown, which is a friendly failure mode for debugging. If {user_prompt} isn't present in the body, the user prompt is simply appended to the end.

Inputs and outputs

• user_prompt (required) - the text to inject or append.
• system_template (required) - the dropdown of templates found in prompts/.
• prompt (STRING) - the combined system + user output, ready to wire into an LLM node.

That's the whole surface. No optional inputs, no knobs.

Install and usage

Manager (search "ComfyUI-Kie-API") or:

cd ComfyUI/custom_nodes
git clone https://github.com/gateway/ComfyUI-Kie-API

Restart, then create a .txt file in prompts/images/ (or prompts/videos/) using the format above. The dropdown refreshes on restart, so after adding a template you'll need to reload ComfyUI.

Where it trips people up

• Templates vanish after edits. The scan happens at node-construction time; new or fixed files require a ComfyUI restart before they show up.
• "No templates found." That's the literal dropdown entry when the scan finds nothing valid - almost always a missing name: or system prompt below line in a new file. Check those two lines before anything else.
• It doesn't call an LLM. This node only assembles a string. The LLM call happens in whatever model node you wire the prompt output into. Pairing it with KIEParsePromptGridJSON downstream is the intended pattern: one standardized system prompt, one parsed grid of prompt outputs.

For anyone running LLM-assisted generation more than once, this is the pack's quiet quality-of-life win - the kind of node you don't miss until you've rebuilt a workflow a third time from a workflow JSON that ate your prompt.