VLM System Instruction Advanced Presets Experimental

Experimental, in pack-speak, means "the newest stuff ships here first." UC_VLMSysInstrAdvPresetsExperimental is the advanced preset node pointed at the experimental preset library - and that library's defining feature is the video-timeline system instructions, including the MiniMax H3 family built for the H3 video model's chat-style prompting. If you're captioning video frames or building prompts for the timeline-structured models, this is the variant you want.

What it is

Structurally it's a clone of UC_VLMSysInstrAdvPresets - same preset dropdown, same jailbreak toggle, same system_query / user_query injection - but it pulls from system_instructions_vlm_experimental instead of the stable library. The default preset is the tell: video_timeline_minimax_h3_base_system_instruction.

What the experimental library contains

The experimental set is dominated by video-timeline instructions:

• video_timeline_system_instruction and _crude - the base timeline captioning prompts.
• video_timeline_minimax_h3_base_system_instruction - the default, built for MiniMax H3's timeline-driven prompting.
• video_timeline_minimax_h3_reference_system_instruction - the reference-image variant.

These matter because MiniMax H3 (the open 33B video model) and the newer Qwen-VL-era pipelines prompt with ordered <Picture N> timeline blocks rather than a single flat caption, and the system instruction has to teach the VLM that structure. The base H3 preset does exactly that: it defines how each timeline entry maps to a target timestamp and how the model should describe progression. That's the kind of detail you'd otherwise have to reverse-engineer from a working workflow.

Since it's the experimental branch, expect these to drift - presets get renamed, split, or folded into the stable library as the underlying models settle.

The inputs and output

• preset - the experimental dropdown.
• jailbreak - wraps the result in extra framing.
• system_query / user_query - injected into the preset's query slots.
• Output: system_instruction (STRING).

Installing it

Part of ComfyUI-UtilsCollection:

cd ComfyUI/custom_nodes
git clone https://github.com/silveroxides/ComfyUI-UtilsCollection

Restart ComfyUI (or use Manager, search "ComfyUI-UtilsCollection"). No models, minimal deps, needs a current ComfyUI.

Common issues

Treat the "Experimental" label as a warning label: the preset list can change between updates, and a workflow saved against a renamed preset will silently fall back or error on load. If you're on the stable captioning path, the non-experimental advanced node is the safer default; reach for this one when your model needs the H3/timeline vocabulary. And remember the injection semantics carry over - system_query overrides preset rules, user_query steers, and jailbreak changes refusal behavior, so use it the same way you would on the stable sibling.