MeltFlex AI MCP server

MeltFlex AI Skills

AI agent skills for photorealistic interior and exterior design and 3D via MeltFlex AI — restyle rooms, place real furniture, swap floors, walls, stairs, doors and windows, redesign kitchens, bathrooms, facades and gardens, and turn 3D drafts into photos, all from a single photo. Then go further: cinematic video walkthroughs, 2D floorplan → 3D model or rendered 3D picture, furniture photo → GLB 3D model, and photo → explorable 3D world. Works with Claude Code, Hermes, Cursor, Codex, Cline, and other AI agents that load Markdown-based skills or speak MCP.

Each user authenticates with their own MeltFlex API key; every generation is billed to their account credits. The skills call the public MeltFlex API directly, so there's nothing extra to install.

Install

Pick one. Each method sets up the skills for your agent.

npx skills — recommended, cross-agent

npx skills add MeltFlexDevs/skills

GitHub CLI (v2.90+)

gh skill install MeltFlexDevs/skills

Claude Code marketplace

Inside Claude Code:

/plugin marketplace add MeltFlexDevs/skills
/plugin install meltflex@meltflex

Setup script

Universal fallback:

git clone --depth 1 https://github.com/MeltFlexDevs/skills.git
cd skills
./setup

More options in INSTALL.md. Agent-driven install (paste into your agent): INSTALL_FOR_AGENTS.md. Cline and other MCP-settings agents: llms-install.md.

Authenticate

You need an active subscription (any paid plan) — without one the key won't work. After subscribing at https://www.meltflexai.com/settings, open account settings → API Key under Profile, then Generate API Key (shown once — copy it):

Then expose it:

export MELTFLEX_API_KEY="mf_sk_xxxxxxxxxxxx"

If you use the MCP server / CLI, you can skip the copy-paste and sign in from the browser instead: npx -y meltflex-mcp auth login opens https://www.meltflexai.com/cli/authorize, mints a key from your signed-in session and stores it in ~/.meltflex/config.json (chmod 600).

Skills

Skill	Invoke	Description
meltflex-design	/meltflex:design	Restyle a room, facade or garden; swap floors, walls, stairs, doors or windows; redesign a kitchen or bathroom; boost a layout; turn a 3D draft into a photo. 16 prompt-driven modes with quality levels, region editing and batches, plus video walkthroughs via the API.
meltflex-furniture	/meltflex:furniture	Place specific real furniture/decor products into a room photo, matching their exact colors, materials, and proportions (up to 10 reference items).
meltflex-3d	/meltflex:3d	3D output: a furniture photo → GLB model, a 2D floorplan → GLB model or rendered 3D picture, a room photo → explorable 3D world (splat + hosted viewer). Handles the long-build polling.
meltflex-embed	/meltflex:embed	Put the design tool on your own website as an iframe: visitors design their room, or place your shop's products in it, without an account. Installs the code in HTML, React, Vue, Shopify or WordPress and fixes a blank frame. No API key.

Image skills are self-contained: a room photo in, a photorealistic redesign out, 10 credits per image (auto-refunded on failure).

Image modes

meltflex-design — 16 modes, each the same POST /api/v1/generate endpoint with a mode-tuned prompt:

Mode	What it's for
restyle	Change a room's style or theme
virtual_staging	Furnish an empty room
layout_boost	Rearrange existing furniture into a better layout
declutter	Clean up / depersonalize a space
exterior	Building facade / house exterior
garden	Landscaping and outdoor design
wall_texture	Change wall material or finish
floor_restyle	Change the flooring
stairs	Restyle a staircase in place
doors	Swap interior doors
windows	Swap window frames / glazing
kitchen	Whole kitchen redesign
bathroom	Whole bathroom redesign
photo_to_render	Turn a 3D draft / SketchUp shot into a photo
seasonal	Time-of-day / seasonal / lighting variation
region_edit	Change only one area — paint it solid red, send mask: true

Optional fields on every image call: resolution (512 / 1K / 2K), designLevel (lite −2 cr · quick · pro +5 cr), variations (1–3 per call, charged per image), up to 10 referenceImageUrls.

Video & 3D

Same key, five more outputs. The three 3D builds can take minutes; they answer HTTP 202 + a poll URL when they outlive the request, and /meltflex:3d shows how to poll.

Output	Endpoint	Credits	Time	MCP tool · CLI
Cinematic walkthrough video (MP4, Veo 3.1)	POST /api/v1/video	100 (4s) / 150 (8s)	~1 min	generate_video · meltflex video
Floorplan → rendered 3D picture (PNG)	POST /api/v1/floorplan-to-3d output: "render"	10	~20 s	REST only
Floorplan → GLB 3D model	POST /api/v1/floorplan-to-3d output: "model"	100	~3 min	floorplan_to_3d · meltflex floorplan
Furniture photo → GLB 3D model (+ USDZ/FBX/OBJ)	POST /api/v1/furniture-3d	75	2–3 min	furniture_to_3d · meltflex furniture
Photo → explorable 3D world (.spz + viewer link)	POST /api/v1/world	30 (draft) / 200 (hd)	~1 / ~5 min	generate_world · meltflex world

Full reference with response bodies and three.js / Spark loader snippets: https://www.meltflexai.com/api.

Quick Reference

What you want	Skill	Note
Restyle a room from a photo	meltflex-design	Pick a mode, write a specific prompt
Furnish an empty room	meltflex-design	virtual_staging mode
Place a specific sofa/bed/table	meltflex-furniture	Pass product images as references
Redesign a house exterior or garden	meltflex-design	exterior / garden mode
Swap flooring or wall finish	meltflex-design	floor_restyle / wall_texture (attach the material as a reference)
Restyle stairs, doors or windows	meltflex-design	stairs / doors / windows mode
Redesign a kitchen or bathroom	meltflex-design	kitchen / bathroom mode
Turn a 3D draft into a photo	meltflex-design	photo_to_render mode
Change only one marked area	meltflex-design	region_edit — paint it red, mask: true
Sharper output / several options	meltflex-design	resolution: "2K", designLevel: "pro", variations: 3
Cinematic video walkthrough	meltflex-design	POST /api/v1/video (100–150 credits)
3D model of a furniture piece	meltflex-3d	POST /api/v1/furniture-3d (75 credits)
2D floorplan → 3D model / 3D picture	meltflex-3d	POST /api/v1/floorplan-to-3d (100 / 10 credits)
Walk through a room in 3D	meltflex-3d	POST /api/v1/world (30 draft / 200 hd)
Check credit balance	—	meltflex credits (CLI) or the MCP check_credits tool

Embed on your website

No API key and no backend: build an embed in the Website Embed Builder (your domain, logo, colour, language, and for shops your product feed), then paste one iframe. Visitors design their room on your page without an account; each design uses 10 credits from your account. Any account gets the code and 10 free designs; after that it runs on an Enterprise plan.

<iframe
  src="https://widget.meltflexai.com/YOUR_EMBED_ID"
  title="AI Interior Design by MeltFlex"
  width="100%"
  height="720"
  style="border:0;border-radius:12px;max-width:100%;"
  allow="clipboard-write"
  loading="lazy"
></iframe>

On a shop's product page, add ?product=<product page address> and the tool opens with that product. /meltflex:embed installs the code in your project (HTML, React / Next.js, Vue, Shopify, WordPress), sets the frame-src rule if your site has a Content Security Policy, and walks through a blank frame. Guide: https://www.meltflexai.com/api#embed.

Use with the MCP server

Agents that prefer tool calls over scripted API calls can run the meltflex-mcp server (npm, stdio). It exposes six tools — generate_interior, generate_video, floorplan_to_3d, furniture_to_3d, generate_world, check_credits — and handles polling and saving files to disk.

npx -y meltflex-mcp auth login              # or: npx -y meltflex-mcp auth mf_sk_xxxxxxxx
claude mcp add meltflex -- npx -y meltflex-mcp

Any MCP client works with the same shape (command: npx, args: ["-y", "meltflex-mcp"], optional env.MELTFLEX_API_KEY). The same package is a terminal CLI: meltflex generate | video | floorplan | furniture | world | credits. A Claude Desktop extension bundle lives in mcpb/.

Hermes

Hermes (Nous Research) speaks MCP, so it runs MeltFlex through the same server.

From the catalog (once merged into the Hermes catalog):

hermes mcp install meltflex

Manually — sign in once, then add the server to ~/.hermes/config.yaml:

npx -y meltflex-mcp auth login

mcp_servers:
  meltflex:
    command: npx
    args: ["-y", "meltflex-mcp"]

Start hermes chat (or run /reload-mcp in a session) to load the six MeltFlex tools. Full guide: https://www.meltflexai.com/mcp.

Going further

• API docs: https://www.meltflexai.com/api
• CLI: https://www.meltflexai.com/cli — meltflex generate from your terminal
• MCP server: https://www.meltflexai.com/mcp — npx -y meltflex-mcp
• Cookbook: COOKBOOK.md · Changelog: CHANGELOG.md

Security

The skills never contain a key. Each user supplies their own mf_sk_ key via MELTFLEX_API_KEY; generations spend that user's own credits. Credits, auth, and rate limits are all enforced server-side. Never commit your key — revoke it anytime in settings.

License

MIT — see LICENSE. Contributions welcome — see CONTRIBUTING.md.