prompt - join

Once you start building prompts from blocks - subject here, style there, quality tags on top - you need something to glue the pieces together without leaving stray commas and double spaces behind. prompt - join takes up to seven text inputs and merges them into one comma-separated prompt, running the whole thing through the pack's standard cleanup as it goes.

The block-building workflow this enables is the ComfyUI way of doing what the KB's prompt-engineering doc describes for SDXL lineage: earlier keywords carry stronger attention, so people assemble prompts as ordered groups - character, then pose, then environment, then quality - and join them so the order stays deliberate. This node is the seam between those groups.

How it works

It concatenates inputs a through g with commas, then normalizes: each tag gets trimmed, runs of spaces collapsed, empty entries dropped, and the result rejoined. So an empty input doesn't leave you with ,,, - empties are filtered out.

A genuinely useful quirk: because the join is literal comma-concatenation, each input can be anything - a block of tags, a single word, even another node's output - and the cleanup handles the seams. Want to drop one block? Bypass its input and the join still produces clean text. It also displays the result as a UI text preview, which makes it a decent place to look at your assembled prompt before it hits the encoder.

Inputs and outputs

• a through g - seven STRING inputs. Leave any unused ones empty; they're filtered out.
• STRING output - the joined, cleaned prompt

That's the entire surface. Seven in, one out.

Installing it

Same pack, same one-time install:

• ComfyUI Manager → search ymc-node-suite-comfyui → Install → restart, or

cd ComfyUI/custom_nodes
git clone https://github.com/YMC-GitHub/ymc-node-suite-comfyui

restart, and pip install -r requirements.txt if you cloned manually (four small yors_* helpers; the pack's auto-install is commented out in source). No models, no GPU - string work only.

Find it via canvas search (prompt / join) or the right-click ymc suite menu.

Common issues

• "I only need two inputs." Fine - leave c through g blank. The node doesn't complain, and empties are filtered out of the output.
• Order is the whole point. The join is a,b,c,d,e,f,g in that exact order, and on SDXL-lineage models earlier position means stronger attention. Put your most important block in a, not g.
• Multi-line inputs get joined raw. If an input has newlines, they survive inside the string (this isn't tags_onelineify). Feed it through prompt - std or prompt - input upstream if you want line breaks collapsed to commas first.
• WAS Node Suite conflicts on the pack's io/save nodes are a possible warning if you run both packs - doesn't affect this node, but it's the usual "why is Manager complaining" answer after installing ymc.

There are also join text nodes elsewhere in the pack (a plain-text variant in the same ymc suite tree), but this prompt-flavored one adds the tag cleanup on top, which is what you want for prompt assembly.