SAX Primitive Store

SAX Primitive Store is a glorified shelf for your workflow's numbers - and that's a good thing. Instead of typing the same seed into three samplers, the same CFG into two, and the same width into a crop node, you define each value once here and fan it out. Every item you add becomes its own output slot, so changing a number in one place updates every consumer. This is the "one source, many consumers" pattern from the plumbing layer, packaged as a single node with a decent editor instead of five loose primitive nodes.

The difference from plain ComfyUI primitives is the SEED type. This node treats a seed as a first-class citizen with a random mode, which is exactly the thing you want when you're comparing runs without typing seeds by hand.

How it works

Items live in an items_json string that the UI manages for you - you don't hand-edit JSON. Each item has a type and a value: INT, FLOAT, STRING, BOOLEAN, or SEED. On execution the node parses the list, converts each value to its type, and emits it from the matching out_0 through out_31 slot (32 max). Unused slots just output None.

The clever bit is inside IS_CHANGED. When an item is a SEED set to random mode, the node returns float("NaN") from IS_CHANGED, which forces ComfyUI to re-execute it every single run - that's the engine's documented always-rerun trick, and it's what makes "give me a fresh random seed each run" work from a node that otherwise looks static. It's also the footgun: a random SEED here makes everything downstream of it rerun every time, which costs you the cache and can slow a big workflow.

The inputs that matter

• items_json - the only real input, and you barely touch it directly; the node UI turns it into a proper editor with drag-to-change ints and float sliders.
• Outputs: out_0 … out_31, all *-typed, each wired to the nodes that need that value.

When you'd use it

Any workflow where the same value appears twice. The classic one is a seed shared by a KSampler and a filename template; the SAX-flavored one is a shared steps/cfg that both a main sampler and a detailer read, so you tune generation settings in one spot. If a value genuinely belongs to only one node, don't bother - the store adds a hop for no benefit.

Installing it

It ships in the SAX_Bridge pack. ComfyUI Manager → "Install via Git URL" → https://github.com/so16tm/SAX_Bridge, or:

cd ComfyUI/custom_nodes
git clone https://github.com/so16tm/SAX_Bridge

Restart, and it's under SAX/Bridge/Utility. No dependencies beyond ComfyUI.

Gotchas

Renaming isn't supported - the docs say to delete and re-add an item to rename it, and that breaks any wires attached to the old slot. Budget for that. And keep an eye on the random-seed rerun cost: if a workflow suddenly feels slower, a SEED in random mode is usually the culprit, poisoning the cache for everything downstream.