MeltFlex CLI for any AI

The MeltFlex CLI turns a room photo into a photorealistic redesign straight from your terminal. The same binary also runs as an MCP server so AI agents (Claude Code, Cursor) can generate through it.

It is a thin client over the MeltFlex API: you sign in to your own account and every generation is billed to your account credits. It enforces nothing itself — credits and access are governed server-side.

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What you can build

Furniture placement is the flagship, but meltflex generate is prompt-driven, so the one command covers the whole MeltFlex tool suite. Change the prompt (and, for material swaps, add a --ref image) and you get a different tool.

Preview a flooring or wall material by passing it as a reference — the same --ref mechanic used for furniture:

meltflex generate \
  --image ./living-room.jpg \
  --ref ./oak-floor-sample.jpg \
  --prompt "Replace the flooring with this wide-plank oak. Only change the floor; keep the walls, furniture and lighting unchanged." \
  --out ./new-floor.png

Install

Requires Node.js 18 or newer.

# Run on demand (no install)
npx -y meltflex-mcp <command>

# …or install globally for a shorter `meltflex` command
npm install -g meltflex-mcp

Authenticate

You need an active subscription (any paid plan). Once subscribed, open your account settings and click API Key under Profile:

Then click Generate API Key. The key is shown only once — copy it immediately.

Save the key once with the CLI:

# Sign in via your browser (recommended) — opens a tab, click "Authorize CLI"
meltflex auth login

# …or save an existing key manually (stored in ~/.meltflex/config.json, chmod 600)
meltflex auth mf_sk_xxxxxxxxxxxx

# Verify
meltflex whoami
# → Authenticated (key mf_sk_xxxxxx…) → https://www.meltflexai.com

Alternatively, set the MELTFLEX_API_KEY environment variable — it takes precedence over the saved file and is convenient for CI.

Commands

generate

Transform a room photo. Costs 10 credits per image (lite −2, pro +5), auto-refunded on failure.

meltflex generate \
  --image ./living-room.jpg \
  --prompt "Redesign in warm Scandinavian style: light oak floor, beige linen sofa, soft daylight" \
  --out ./redesign.png

# → ✅ Saved to ./redesign.png
# → Credits used: 10

Sharper, most-detailed render — plus three variations to choose from:

meltflex generate \
  --image ./living-room.jpg \
  --prompt "Modern minimalist living room, warm oak floor, low grey sofa" \
  --quality 2K \
  --level pro \
  --count 3 \
  --out ./redesign.png

# → Generating 3 variations…
# → ✅ Saved 3 variations:
# →   • ./redesign-1.png
# →   • ./redesign-2.png
# →   • ./redesign-3.png
# → Credits used: 45

video

Animate a still image (a MeltFlex render or any interior photo) into a short cinematic walkthrough. Costs 100 credits for a 4-second clip, 150 for 8 seconds. Generation is asynchronous and typically takes 30 to 120 seconds.

meltflex video \
  --image ./living-room-render.jpg \
  --duration 4 \
  --aspect 16:9 \
  --out ./walkthrough.mp4

# → Generating a 4s walkthrough… (this can take 30–120s)
# → ✅ Saved to ./walkthrough.mp4
# → Credits used: 100 • Generated in 42.28s

floorplan

Convert a flat 2D floorplan image into a downloadable GLB 3D model. Costs 100 credits. Drop the GLB straight into three.js, Blender, Unity or any glTF viewer.

meltflex floorplan \
  --image ./2d-floorplan.png \
  --out ./model.glb

# → ✅ Saved to ./model.glb
# → Credits used: 100

furniture

Turn one photo of a furniture piece into a textured, downloadable GLB 3D model, the same engine as the AI 3D Furniture Generator. Costs 75 credits, refunded if the build fails. Takes about 2 to 3 minutes; the command waits and prints progress. Best input: one piece, front three-quarter view, plain background, nothing cropped.

meltflex furniture \
  --image ./armchair.jpg \
  --out ./armchair.glb

# → Building a 3D model from the photo… (this takes about 2–3 minutes)
# → ✅ Saved to ./armchair.glb
# → Hosted URL: https://…/meshes/api_….glb
# → USDZ (signed, ~72 h): https://assets.meshy.ai/…
# → Credits used: 75

world

Turn a room photo or render (for example a generate result) into an explorable 3D world you can look around and walk through, the same engine as AI 3D Interior Design. 30 credits for a draft world (about a minute), 200 for hd (about five minutes). Prints the permanent world id and a hosted viewer link, and saves the .spz splat file.

meltflex world \
  --image ./living-room-render.jpg \
  --model draft \
  --out ./living-room.spz

# → Building a draft 3D world… (about a minute)
# → ✅ World ready: 8641d179-d7c6-4b39-94b6-101a420e8d80
# → Open in a browser: https://marble.worldlabs.ai/world/8641d179-…
# → Splat saved to ./living-room.spz
# → Credits used: 30

credits

Check your balance before a batch of generations.

meltflex credits

# → MeltFlex account (you@studio.com)
# → Balance: 930 credits  (earned 1000, spent 70)
# → Cost per operation:
# →   • photo: 10
# →   • video: 100  …

Examples

Place specific furniture

Pass one or more --ref images to drop exact products into the room. The AI matches their colors, materials and proportions.

meltflex generate \
  --image https://your-cdn.com/empty-room.jpg \
  --prompt "Place these furniture items naturally in the room" \
  --ref ./sofa.jpg \
  --ref ./dining-table.jpg \
  --out ./furnished.png

Edit only one part of the room

Paint the area you want to change solid red in any image editor, then pass--mask. The prompt is applied only to the red region and the rest of the room is preserved exactly.

# First paint the area to change SOLID RED in the image (any editor),
# then --mask applies the prompt ONLY to that red region:
meltflex generate \
  --image ./room-red-marked.png \
  --prompt "Put a large green velvet armchair in the red area" \
  --mask \
  --out ./edited.png

Notes & limits

• Subscription: API keys require an active subscription (any paid plan).
• Credits: 10 per image (lite −2, pro +5) × the number of variations, deducted upfront and refunded automatically for any variation that fails.
• Inputs: MeltFlex restyles an existing photo — it does not generate rooms from scratch.
• Security: your key lives only on your machine; revoke it anytime in settings.