Boyo Latent Passthrough

A latent passthrough sounds like the most pointless node imaginable - take a latent, return the same latent. But in loop-heavy workflows it earns its keep. The problem is reference contamination: when you're looping a latent through ComfyUI's cache system, a plain pass-through can carry hidden state between iterations, and suddenly iteration 3 is being influenced by iteration 2 in ways you didn't ask for. Boyo Latent Passthrough's real job is to break those references by cloning the tensor into fresh memory.

The force_copy toggle (on by default) does a deep clone of the latent dict - tensors get .clone().detach(), everything else gets deep-copied - so downstream nodes can't mutate the original through a shared reference. Flip it off and you get the literal no-op passthrough, useful when you want to confirm the node isn't the culprit.

The inputs

• latent - the LATENT to pass through.
• force_copy - default true. Deep-clone to break state references, or plain pass-through when false.
• clear_cache - default false. When enabled it runs garbage collection and torch.cuda.empty_cache() before passing through. Aggressive, but handy right before a memory-hungry stage in a long batch.

Output: latent_out - functionally the same latent, possibly a fresh copy.

Install

Part of Boyonodes. ComfyUI Manager → search "Boyonodes", or:

cd ComfyUI/custom_nodes
git clone https://github.com/DragonDiffusionbyBoyo/Boyonodes

Restart. No extra dependencies.

When you actually need it

Honestly? Sometimes you don't. It's a debugging and hygiene tool. Reach for it when a looped workflow produces results that change between runs despite a fixed seed, or when an iteration seems to inherit the previous one's artifacts. Drop it in line with force_copy on and see if the weirdness disappears. The same file also ships a sibling, Boyo Execution Barrier, for enforcing execution order between otherwise unconnected branches - this node is the reference-cleaner, that one is the order-enforcer. Different jobs, same category.