Extension Manager

Extension Manager

Extensions are custom node packs for ComfyUI — they add new node types that enable advanced workflows like upscaling, face fixing, ControlNet variations, and video generation. When you import a Pipe that uses nodes from an extension you don't have installed, the Extension Manager is where you fix that.

The Missing Node Scenario

You'll encounter this situation regularly, especially when importing Pipes from the web or from other users:

1. You import a new Pipe or open one that was working fine before.
2. Studio shows a "missing node" warning — it lists the specific custom node types the workflow needs that aren't installed.
3. The Pipe can't generate until those nodes are available.

This isn't a bug or a prompt problem — it's a dependency that needs to be installed. The Extension Manager makes this straightforward.

Installing Missing Extensions

Here's the step-by-step process for resolving missing nodes:

1. Identify what's missing — Open the Pipe and note the missing node names from the warning. They'll look something like ControlNetApplyAdvanced or UltimateSDUpscale.
2. Open the Extension Manager from the sidebar.
3. Find the node pack that provides the missing nodes. The manager can match missing node names to known packs.
4. Install the pack — Click install and the manager handles downloading and setting up the extension.
5. Watch the install logs — Progress and any errors appear in the log stream for that install job.
6. Restart the runtime — Many extension installs require a ComfyUI restart before the new nodes are registered. Studio will tell you when a restart is needed.
7. Re-run your Pipe with a simple test to confirm everything works.

Tip: After installing, if the missing node warning persists, make sure you've restarted the runtime. Node registration only happens at startup — installing an extension doesn't immediately make its nodes available.

Install Logs and Rollback

Every install runs as a tracked job with its own log stream. If something goes wrong:

• Check the install log for the specific job to see what failed (download error, compatibility issue, Python dependency conflict, etc.).
• If an install broke something that was working before, use the rollback option to revert to the previous state.
• Clean up failed or partial install jobs before retrying — delete the failed job entry, then start fresh.

Warning: Extension compatibility issues are the most common cause of difficult-to-diagnose problems. If your previously-working Pipes start behaving strangely after installing a new extension, rollback that install and test again before investigating other causes.

Manual Installation

If the managed install path doesn't have a pack you need (or if the managed install keeps failing), you can install extensions manually:

1. Clone or download the node pack into your ComfyUI custom_nodes/ directory.
2. Install any Python dependencies the pack requires (pip install -r requirements.txt from the pack's directory).
3. Restart the ComfyUI runtime.
4. Refresh the dependency check in Studio to verify the nodes are now available.

Manual installs work fine but don't have the same traceability as managed installs — there's no install log or one-click rollback.

Restart Expectations

Some things to know about how restarts interact with extension changes:

• Most extension installs require a restart before nodes are available. This is a ComfyUI requirement, not a Sweet Tea limitation.
• Restarts reload all extensions, so a restart after installing one pack will also pick up any other changes made since the last restart.
• If missing-node warnings persist after install + restart, the extension may not be compatible with your ComfyUI version, or it may have unmet Python dependencies.

Sweet Tea Nodes

Sweet Tea maintains its own custom node pack — Sweet Tea Nodes — that provides advanced building blocks for specific workflows:

• Ultimate SD Upscale (Pose Tiled ControlNet) — Higher-fidelity tiled upscaling with seam-fix and alignment tuning for cleaner large-image results.
• Wan VACE -> Video (caps inpaint) — Temporal cap-stitching and transition reconstruction for video workflows.

The Sweet Tea Nodes pack can be installed through the Extension Manager or manually from the repository. It's a normal ComfyUI extension pack — you don't need any special integration to use it.

Next: Prompt Library & Snippets