James VeitchandClaude Sonnet 4.6
ca1c35a3cf
Replace hand-crafted PowerPoint exports with Playwright-generated screenshots taken from the actual running Docker test harness: - scripts/take_screenshots.py: headless Chromium via Playwright; creates nodes programmatically via LiteGraph/window.app, triggers updateNodeConfig() for FormatString's dynamic socket update, then crops tightly around each node - docs/assets/: four screenshots (fstring, jinja2, random, circuit_breaker) replacing the old 1920×1080 PowerPoint exports (90%+ smaller, more accurate) - Justfile: add `screenshots` recipe (starts harness if needed, waits healthy, runs the script) - README.md: rewrite to cover all three nodes including Circuit Breaker; fix stale dependency list (was listing rich/colorama/termcolor which we removed in spec 001); add ComfyUI Manager install path - pyproject.toml + uv.lock: add playwright to [dev] dependencies Run: just screenshots Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RWysE6jYn4YjNorLBQ1cXb
comfydv
A collection of workflow efficiency and quality-of-life nodes built out of necessity for personal ComfyUI use.
What is this?
comfydv fills gaps in ComfyUI's built-in node library: dynamic string formatting, seed-controlled random selection, and graceful workflow interruption. Install it once and connect the nodes like any other — no Python knowledge required.
| Node | What it does |
|---|---|
| Format String | Formats a string from a Python f-string or Jinja2 template. Detects variables in the template and automatically adds/removes input sockets. |
| Random Choice | Accepts any number of typed inputs and outputs one at random, with a configurable seed for reproducibility. |
| Circuit Breaker | Halts the current ComfyUI queue run gracefully without crashing the server. Wire the status toggle to a boolean condition to skip the rest of the queue when a condition isn't met. |
Install
Via ComfyUI Manager (recommended): search for comfydv and click Install.
Manual:
cd /path/to/ComfyUI/custom_nodes
git clone https://github.com/darth-veitcher/comfydv.git
Restart ComfyUI. The nodes appear under the dv/ category in the node menu. The only runtime dependency is jinja2, which is installed automatically via requirements.txt.
Documentation
Full documentation: darth-veitcher.github.io/comfydv
Format String
Formats text from a Python f-string or Jinja2 template. As you type the template, input sockets appear and disappear automatically — one per variable detected.
Python f-strings
Type {variable_name} and a socket appears. Wire it to any string output in your workflow.
Outputs are always in a stable order:
| Output | Content |
|---|---|
formatted_string |
The rendered result |
saved_file_path |
Path written to disk (if save_path is set) |
<var> … |
Pass-through of each input value, for easy chaining |
Jinja2 templates
Switch template_type to Jinja2 to unlock filters (| upper, | int, …), conditionals ({% if %}…{% endif %}), and loops.
Variables detected in {{ }} expressions become input sockets exactly as in Simple mode. See the Jinja2 documentation for the full filter/test reference.
Random Choice
Connect any number of inputs of the same type. Each run picks one at random. Set seed for reproducibility.
- Accepts any ComfyUI type (STRING, IMAGE, CONDITIONING, …)
- Add as many inputs as you like; unused slots are removed automatically when disconnected
seed = 0randomises on every run; any other value locks the selection
Circuit Breaker
Stops the queue gracefully when a condition isn't met — no crash, no error, just a clean halt.
Wire an image (or any trigger) into trigger and a boolean into status. When status is false the node raises InterruptProcessingException, which tells ComfyUI to stop the current run cleanly. When status is true the image passes through unchanged.
Typical use: skip an expensive upscale step when a quality-check node says the draft is already good enough.