TagFlag

TagFlag is a four-channel switchboard for tag strings. It takes up to four (tag string, flag) pairs, and each flag decides whether its tag string makes it out. Flip a flag off and that channel goes silent - no rewiring, no node bypassing, just a boolean. The outputs are the four channel strings plus an all_tags port that merges whichever channels are currently enabled into one comma-separated string.

Think of it as the manual version of the pack's automatic filters. TagFilter decides what passes by category; TagFlag decides what passes by your hand - or by whatever boolean you feed into the flag inputs. Since the flags are regular BOOLEAN inputs, they don't have to be typed toggles. You can drive them from a condition node, a randomizer, or a saved workflow parameter, which turns TagFlag into a genuinely dynamic mixer: four tag groups, each individually switchable at runtime.

The inputs and outputs that matter

• output_tags1 through output_tags4 - the tag strings. The first pair is required; channels 2–4 are optional.
• output_flag1 through output_flag4 - the on/off switches. Default all true. A false flag zeroes that channel.
• Outputs output_tags1..4 - each enabled channel's string, passthrough. Disabled channels emit an empty string.
• Output all_tags - the union of all enabled channels, deduplicated and re-emitted through the pack's tag parser, so emphasis weights survive.

The pattern to use this for: keep four distinct tag groups (character, outfit, expression, scene) wired into TagFlag, and let a UI toggle or a conditional decide which combinations are live. all_tags is what you'd feed the text encoder; the per-channel outputs exist for when you need to know which branch won.

The gotchas

Disabled channels don't return None - they return an empty string. If you concatenate output_tags2 blindly downstream, you'll get an empty chunk, not an error. That's fine for TagFlag's own all_tags merge (it skips empties), but if you branch off a channel, guard for the empty case.

Also, all four flags default to true, so out of the box this node is a pass-through mixer that merges everything. The filtering only starts when you flip something off - which trips up people who expected it to default to "nothing enabled." It's a "include" switchboard, not an "exclude" one.

Install

Same pack, same steps: ComfyUI Manager search "comfyui_tag_filter", or

cd ComfyUI/custom_nodes
git clone https://github.com/sugarkwork/comfyui_tag_fillter

Restart. No dependencies, no model downloads. If you want the image-flavored version of the same idea - flags that pick between images instead of tag strings - that's TagFlagImage, one node over in the same pack.