Loopcut

loopcut

The connector for Loopcut, an open-source AI agent inside Blender: cloud render, assets, images, 3D models, motion and audio for Claude Code, Codex, Cursor, Claude Desktop and the shell, and as a hosted connector for claude.ai and ChatGPT. Render .blend files on cloud RTX 4090s, search free asset libraries, make and edit images, turn images into 3D models, remesh meshes, rig characters, make sound effects and voice lines, and turn a video or a sentence into character animation on your own rig. Results come back as files the agent imports with Blender's Python. Everything is paid from your Loopcut account's credits. You don't need the Loopcut app; any Blender install packs the scene.

It's one MCP server plus a CLI with the same verbs. The tools come from Loopcut's catalog, so a cloud tool that opens on Loopcut shows up without a new release.

Results are files the next tool takes: a generated image as image_to_3d's image, a model as remesh's model, a rendered frame as image_edit's image. With a budget from you, the agent passes max_credits to a paid tool, which starts a quote within it at once instead of returning it for job_start.

A character from a photo, rigged and animated: image_edit the photo into a T-pose with separated fingers, image_to_3d from that with topology: "quads", import it and save the .blend, auto_rig it (20 credits), then motion_from_text and motion_apply. auto_rig takes humanoids with clear arms, legs and fingers, up to 100,000 triangles; a rig that can't be bound is refunded automatically.

Motion

Two motion tools, with a free local tool to use their results:

motion.bvh is a rig-neutral SOMA 77-joint skeleton (standing T-pose rest, centimetres, Y up, 30 fps). The connector measures the clip's length itself (MP4 and MOV from the file header, WebM with ffprobe when it's installed) because the quote holds the seconds captured. target_armature and in_place on a motion tool are kept on your machine for motion_apply and never sent to Loopcut. job_status returns the result with three ways to use it: motion_apply (or loopcut motion-apply) for a saved .blend, a short Python snippet for a Blender that's already open (for example through another Blender MCP), and Blender's plain BVH import. The retargeting is the Loopcut add-on's own, so results match the app. With no-generation on, motion_from_video stays available (it records the user's own performance) and motion_from_text is hidden.

Price. 1 credit = $0.01. Every paid tool quotes first, for free, and the quote is the most a job can cost. Rendering costs 5 credits per GPU-minute on an RTX 4090 with a one-minute minimum; the other prices are on loopcut.org/pricing. Asset search, quotes, packing and the render QA report are free. Failed jobs are refunded. New accounts start with 100 credits.

Install

You need uv (it provides Python 3.10+), and Blender if you render or apply a motion. To get uv: brew install uv or curl -LsSf https://astral.sh/uv/install.sh | sh on macOS and Linux, powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex" on Windows.

claude.ai, ChatGPT and Claude Desktop, nothing to install: add https://loopcut.org/mcp as a connector and sign in with Loopcut. In Claude: Customize → Connectors → Add custom connector. In ChatGPT: chatgpt.com/plugins → + → Add custom MCP server (custom servers with paid tools need a Business, Enterprise or Edu workspace until Loopcut is in ChatGPT's plugin directory). The hosted connector has asset search, images, 3D models, remeshing, motion from text, sound, voice and rendering from a script, and returns download links; one tool's result feeds the next by its job: / ref. Rendering your own .blend and motion from a video need the plugin below, because they read files on your computer.

Claude Code (plugin, which includes a skill that teaches the agent the tools and the habits that save credits)

/plugin install loopcut --marketplace loopcut-ai/loopcut

On Claude Code before 2.1.275, run /plugin marketplace add loopcut-ai/loopcut and then /plugin install loopcut@loopcut. Or add only the MCP server:

claude mcp add loopcut -- uvx loopcut mcp

Codex (plugin, with the same skill)

codex plugin marketplace add loopcut-ai/loopcut

codex plugin add loopcut@loopcut

Or add only the MCP server:

codex mcp add loopcut -- uvx loopcut mcp

Every tool call returns within 50 s, under Codex's default 60 s tool timeout; long work carries on between calls. Both plugins start the server with uvx loopcut== mcp, pinned to the release they ship with; the package has no dependencies beyond Python.

Cursor, VS Code, Claude Desktop and other MCP clients

{

"mcpServers": { "loopcut": { "command": "uvx", "args": ["loopcut", "mcp"] } } }

Apps opened from the Dock or Start menu may not see your shell's PATH. If the server doesn't start, use the full path from which uvx as command.

The first call opens a browser to sign in, and the key is kept where only you can read it. Without a browser (over SSH, say), the call returns the link for you to open. LOOPCUT_API_KEY skips all of this.

CLI

loopcut login                                         # once per machine

loopcut account # plan, credits, settings loopcut tools # the open tools and their inputs loopcut render shot.blend --frames 1-120 --samples 256 --max-credits 300 loopcut run asset_search --input '{"query": "oak floor", "kind": "material"}' loopcut run image_to_3d --input '{"prompt": "a brass desk lamp", "quality": "draft"}' --file image=lamp.png --max-credits 30 loopcut quote sound_effect --input '{"prompt": "a heavy wooden door slams", "duration_seconds": 2}' loopcut run motion_from_video --file video=take.mp4 --input '{"static_camera": true}' --blend shot.blend --max-credits 60 loopcut run motion_from_text --input '{"prompt": "a person jumps over a puddle", "duration_s": 4}' --yes loopcut motion-apply --blend shot.blend --bvh loopcut_outputs/JOB_ID/motion.bvh --armature Hero --in-place loopcut motion-apply --bvh loopcut_outputs/JOB_ID --bpy # Python for a Blender that's already open loopcut start QUOTE_ID | status JOB_ID --wait | fetch JOB_ID --out DIR | cancel JOB_ID loopcut settings --private-mode off # or on; also --no-generation on|off

Install the command with uv tool install loopcut, or run any command without installing as uvx loopcut …. run and render quote, then start only with --yes, under --max-credits N, or after you answer the prompt. run of a motion tool with --blend also puts the motion on that scene's rig; motion-apply saves over --blend (Blender keeps the previous file as .blend1) unless you give --out. Results print as JSON on stdout; progress goes to stderr. In CI, create a key on loopcut.org/account and set LOOPCUT_API_KEY.

Settings

Private mode and no-generation. These account settings apply here too. Private mode (on by default on paid plans) refuses tools whose provider may train on what it receives; today that is sound effects. No-generation hides and refuses the generative tools. Change them in the Loopcut app or with loopcut settings.

How it works

1. Quote. Every tool goes through the same job API the Loopcut add-on uses. A quote prices the exact request and lasts ten minutes; an expired one is renewed at start, and the job goes ahead only if the price didn't change. Starting the same quote twice returns the same job.
2. Files in. File inputs are local paths. They're checked (type and size), addressed by SHA-256, and only uploaded if the cloud doesn't already have them, straight to storage with presigned URLs. Big files go in parts, each retried on its own.
3. Render packing. A background Blender (-b --factory-startup --disable-autoexec) opens the saved .blend and runs the Loopcut add-on's own collector (addon/bundles.py, vendored). It copies every texture, library, cache and sequencer file into