ComfyUI-ConditionalPassThrough

Conditional Pass-Through 🔀

A ComfyUI custom node that gates any value through based on the presence of a second input — letting you build chainable conditional pipelines without boolean outputs.

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How it works

value     ──┐
             ├──► [Conditional Pass-Through] ──► value  (or None)
condition ──┘

| condition wired? | output | |---|---| | ✅ Yes (any value) | value passed through unchanged | | ❌ No / disconnected | None |

The output type mirrors value exactly, so the result plugs straight into any downstream node — or into another gate.

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Install

Option A — Manual

1. Copy the ComfyUI-ConditionalPassThrough/ folder into your ComfyUI/custom_nodes/ directory:

   ComfyUI/
   └── custom_nodes/
       └── ComfyUI-ConditionalPassThrough/
           ├── __init__.py
           ├── conditional_passthrough_node.py
           └── README.md
   

2. Restart ComfyUI.

Option B — Git clone

cd ComfyUI/custom_nodes
git clone https://github.com/otuncelli/comfyui_conditional_passthrough

Then restart ComfyUI.

The node appears under utils/logic as "Conditional Pass-Through 🔀".

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Inputs & Outputs

| Pin | Type | Required | Description | |---|---|---|---| | value | * (any) | ✅ | The payload to forward — image, latent, string, number, anything | | condition | * (any) | ❌ | Gate trigger — connect anything; its presence opens the gate | | ➡ value | * (any) | — | The forwarded value, or None if gate is closed |

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Use cases

1. Simple guard — only decode if a latent exists

[KSampler] ──value──► [Gate] ──► [VAE Decode]
                          ▲
                     [some condition]

2. Chained gates — all conditions must be met

Run downstream processing only when multiple upstream steps have all produced output:

[KSampler A] ──value──► [Gate 1] ──► [Gate 2] ──► [VAE Decode]
                             ▲             ▲
                        [Result B]    [Result C]

Both Gate 1 and Gate 2 must be open for the latent to reach the decoder.

3. Optional style injection

[Base latent] ──value──► [Style Gate] ──► [KSampler]
                               ▲
                        [Style prompt]   ← leave disconnected to skip

Swap a style in or out simply by wiring/unwiring the condition — no need to rebuild the graph.

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Compatibility

• ComfyUI (any recent version supporting wildcard "*" inputs)
• No extra dependencies — pure Python, no pip installs needed
• Works alongside ImpactPack, rgthree, and other logic node packs

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License

MIT — do whatever you like with it.