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by FireTable
Zero-GPU-idle gateway for running ComfyUI on ephemeral Google Colab VMs with Zero-Trust Access
# Add to your Claude Code skills
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comfy-colab-kit is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by FireTable. Zero-GPU-idle gateway for running ComfyUI on ephemeral Google Colab VMs with Zero-Trust Access. It has 97 GitHub stars.
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Clone the repository with "git clone https://github.com/FireTable/comfy-colab-kit" and add it to your Claude Code skills directory (see the Installation section above).
comfy-colab-kit is primarily written in Python. It is open-source under FireTable on GitHub, so you can review or fork the full source.
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[!IMPORTANT] Personal-use tool. Colab compute belongs to your Google account. Sharing it with others may violate the Colab terms/FAQ (e.g. reselling or sharing compute) and can get the account restricted. Keep access to yourself or a handful of family/friends. Not affiliated with Google or Comfy Org.
A tiny gateway, comfy-gate (Python / aiohttp), runs either 100% locally on your Mac/PC (zero VPS, zero domain, zero setup fees) or on a Linux VPS behind Cloudflare Access.
[!NOTE] The Gate's Essential Role:
comfy-gateis fundamentally a lifecycle, cold-start, and auto-shutdown gateway — it does NOT reimplement ComfyUI. When the GPU is asleep, it serves a lightweight, zero-compute wake card with real-time SSE progress. When booted, it transparently reverse-proxies directly into the authentic, full-featured ComfyUI Web Application (including node graph, App mode, custom nodes, extensions, and WebSocket streaming), injecting only a non-intrusive floating overlay to switch between App mode and the Node Graph.
| Pillar | What you see | How |
|---|---|---|
| 1 · Wake on demand | Sleep card → Wake → stages + logs → ComfyUI Web App | 10-state machine, colab new (L4) + setup via colab exec, streaming reverse proxy (HTTP + /ws) |
| 2 · Switchable profiles | Pick MOSS-Image, FLUX.2 Klein, Wan 2.2 Video, SD3.5, Qwen before waking | profile.yaml + JSON Schema; zero secrets, models by public URL |
| 3 · Auto-stop | Overlay shows time left; sleeps on idle / max session / quiet hours / CU budget | every rule configured in .env |
| 4 · Run Anywhere | Local Standalone (http://localhost:8080) or Cloud VPS (comfy.domain.com) |
1-command Docker / Python launch; no VPS or domain needed for local users |
Three real sessions where an AI agent called the gateway end-to-end — no browser, no manual cell.
| 🟢 Text-to-Image | 🟣 Image-to-Image | 🎬 Text/Image-to-Video | |
|---|---|---|---|
| Agent command | text to img: a pic about "hello world: comfy-colab-kit" 1024 × 1024 |
img to img, using the highest quality, generate an image based on the reference image, maintaining the original composition, and completely change the girl's outfit to a bikini. |
A cinematic tracking shot of a cute red panda walking through a mossy bamboo forest in soft morning sunlight, golden dust motes floating in the air, shallow depth of field |
| Skill entry | /comfy-colab-kit |
/comfy-colab-kit |
/comfy-colab-kit |
| Pipeline | MOSS-Image DeBand text-to-image | character matte → beach plate → MOSS-Image DeBand img2img | wan-ltx-video · Wan 2.2 5B TI2V (Wan22ImageToVideoLatent) |
| Profile preset | Fast alt — 10 steps + anti-banding LoRAs |
Quality — 25 steps, banding-fix LoRAs at full strength |
Official Wan 2.2 5B 20-step uni_pc (shift=5.0, cfg=5.0) |
| Resolution | 1024 × 1024 | 1024 × 1024, 2 variations | 832 × 480 · 33 frames @ 24 fps (HD MP4) |
| GPU state on arrival | already ready — no wake-up needed |
already ready — session reused |
woke from sleeping (19.8 GB streamed at 518 MB/s) |
| Wall time | 41 s | 2 m 14 s | 65 s generation |
| Output | one PNG (outputs/hello-world-comfy-colab-kit-1024.png) |
beachA (sheer wrap) and beachB (plain two-piece) |
one H.264 MP4 (WanVideo_00001_.mp4) + preview GIF |
| CU ledger | 22.16 CU left · 1.71 CU/hr while up | 20.99 CU left · 1.71 CU/hr while up | 1.71 CU/hr while up · auto-stopped immediately after |
| Afterwards | agent can call stop to release the GPU immediately |
agent keeps the GPU warm for the next variation, then releases it | agent downloads MP4 & calls ckit stop immediately |
All flows run entirely through the gateway's REST/MCP surface: the agent never touches a browser, a notebook cell, or a Colab URL.
Traditional Colab forces you to sit in front of a computer, manually run notebook cells, and baby-sit browser tabs that disconnect when your laptop sleeps. Comfy Colab Kit completely decouples compute execution from human attendance:
| Dimension | ❌ Traditional Colab Notebooks | ⚡ Comfy Colab Kit |
|---|---|---|
| Trigger Method | Sit at PC, open browser, manually execute cells | Anywhere & Autonomous Agents: 1-click wake on mobile, tablet, or headless AI agent (REST / MCP) |
| Session Reliability | Dies if laptop sleeps, tab closes, or Wi-Fi blips | Decoupled Cloud Gateway: VPS gateway persists state, auto-reconnects, survives local disconnects |
| Access & Security | Ephemeral random *.trycloudflare.com URLs with zero auth |
Single Custom Domain + Cloudflare Access: Enterprise Zero-Trust SSO / OTP, service tokens for agents |
| Collaboration | Teammates accidentally spin up duplicate VMs, burning CU | Global Idempotent Shared Session: All visitors join the running instance with live streaming logs |
| Budget Safety | Leaving notebooks running overnight drains entire CU quotas | Smart Auto-Shutdown: Automatic spin-down on idle (e.g. 20m), max session time, or CU hard budget |
| Automation & MCP | Inaccessible to headless AI coding agents | AI Agent & MCP Native: Full Model Context Protocol (stdio + HTTP), ckit CLI, RFC 8628 device flow, /comfy-colab-kit skill |
STATE_DIR/session.json).ckit mcp) and remote HTTP (/mcp), exposing gate_status, gate_wake, gate_txt2img, gate_img2img, gate_generate, and gate_stop.OWNER_ONLY_CONTROL=true restricts wake, stop, profile switch, and extension to administrators (OWNER_EMAILS), safeguarding Colab compute units while allowing all authenticated team members to share ComfyUI once ready. Switchable to Mode A collaborative control ("who wakes can stop").Cf-Access-Jwt-Assertion (RS256, AUD, issuer).