🐰 Tile Prompter - McBoaty [2/3] - v5 /u

If you've ever run a tiled upscale and wanted to say "fix just that corner," the McBoaty Tile Prompter is the node that was built for that sentence. It's the [2/3] middle node of the v5 McBoaty set, sitting between the Upscaler and the Refiner, and its entire job is letting you override the prompt (and by extension what the sampler does) on a per-tile basis.

How it works

The Upscaler hands you a McPrompty Pipe - the pipe that carries per-tile prompt data. You connect it to the TilePrompter's pipe input, and the node exposes 64 text boxes, tile 00 through tile 63, one per tile. Whatever you type into a tile's box becomes that tile's prompt when the Refiner runs. Leave a box empty and that tile just uses the default prompt the Upscaler assigned. There's also a requeue integer input - bump it to force a re-run and regenerate prompts, which is useful when you're iterating on a prompt set and want to watch it update without rebuilding the whole graph.

Output is a single McPrompty Pipe carrying the edited tile prompts, which you feed into the Refiner's pipe_prompty input.

Why 64 tiles

The tile count is capped at 64 by design - the v5.7.0 changelog is literally "Tile Prompter: hotfix issue applying max 64 tiles." If your image slices into more tiles than that (huge images at small tile_size), you'll need to raise tile_size or the feather overlap to bring the count down. That's not a bug, it's the input grid running out of rows - which is also the honest argument for the v6 TilePrompter's index-based approach, where you select tiles by number instead of having 64 static boxes.

The practical loop: run your upscale, look at the tiles output from the Refiner to see which tile is wrong, note its number (they're 1-indexed, matching the tile 00 = tile 1 convention), and type a fix into that box. Then re-run with the same seed. That's the entire workflow - it turns "regenerate the whole 4K image and pray" into "retouch cell 17."

Install

cd ComfyUI/custom_nodes
git clone https://github.com/MaraScott/ComfyUI_MaraScott_Nodes

Restart, or ComfyUI Manager → "MaraScott". No extra models beyond what the pack needs - this node is prompt plumbing.

A couple of honest notes. First, the prompts you type here are per-tile prompts, and with the Refiner's canny ControlNet anchoring them, they mostly steer detail rather than wholesale composition - a tile's structure is already locked by the canny edges. Second, if you're not the "edit 64 fields" type, that's fine - you can skip this node entirely and let the Refiner use the Upscaler's default prompts. The Tile Prompter is an option, not a requirement, and the moment you skip it you're running McBoaty as a plain tiled upscaler. But when one tile out of fifty is ruining the print, it's the difference between a 15-minute fix and an afternoon of trying again.