FableCut

Zero-dependency browser video editor whose project.json is the interface, with MCP and REST on top.

AdaptableOperable ProductWeb app Deterministic JavaScript MCP server License: MIT

A Premiere-style editor served by one Node file. The whole timeline is a JSON document; an agent patches it over a stdio MCP server or REST and the open browser UI hot-reloads. Filters, keyframes, kinetic captions, animated SVG overlays, and a reference-video analyzer are built in.

Use it when

I want an agent to assemble reels from my clips to the beat while I watch the timeline and fix things by hand
I need a self-hosted editor with no build step that my agent can drive from a JSON file

Gotchas

Export is a browser action; the agent cannot finish the job without a human click or a separate ffmpeg render
Chromium-based browser required; ffmpeg optional but needed for fast export
Concurrent edits are guarded by a revision counter; agents get 409s if you edit at the same time

Last activity Sep 1, 2026. Fit: adaptable 3, operable 2.

Editions

Free · Free open source

Clonegit clone https://github.com/ronak-create/FableCut
Installgit clone https://github.com/ronak-create/FableCut.git && cd FableCut && node server.js
Install/plugin install fablecut@fablecut

For agents: JSON · Markdown

Adaptable: what is yours to change

Make it yours

Config only10 things to edit

Set FABLECUT_DATA_DIR to keep project.json, media, exports, and library outside the checkout. Edit encoding-profiles.json (hot-reloaded) for export presets and pin one with encodeProfile in project.json. Drop fonts, overlay art, SFX, and SVGs into library/. HOST and FABLECUT_ALLOWED_HOSTS open it to a LAN. The agent manual is CLAUDE.md, which you can extend with house recipes.

Env vars: FABLECUT_DATA_DIR HOST FABLECUT_ALLOWED_HOSTS
Config files: encoding-profiles.json project.json library/fonts/ library/elements/ library/svg/ library/sfx/
Prompt files: CLAUDE.md
Accounts you need: none

Source

github.com/ronak-create/FableCut
MIT license
Last commit Sep 1, 2026
651 stars

Operable: what an agent can drive

Interface

OfficialMCP serverpublished by the builderlocal

How an agent can drive an Operable Listing, in five levels: native (built for the agent as the primary interface), official (the Builder ships an agent interface), wrapped (a third party wraps the software's API), config (an agent can only drive it by editing files), gui (screen control only). An interface is official only when it is published by the same organization that ships the software. GUI-level Listings are allowed and sorted last.

Docs: github.com/ronak-create/FableCut#driving-it-with-an-ai-agent

Reach

Partial coverage. 8 of 10 jobs reachable through the stated interface.

Job	Through the interface	Evidence
Cut, trim, and arrange clips on 3 video and 4 audio tracks	Reachable	MCP tools fablecut_patch_project, fablecut_set_project, fablecut_get_project
Import media	Reachable	MCP tool fablecut_import_media; REST POST /api/upload
Color grades, filters, adjustment layers, chroma key	Reachable	README: effects are properties in project.json; CLAUDE.md schema served by fablecut_docs
Keyframe animation, speed ramps, transitions	Reachable	README: keyframes and transitions are project.json fields
Titles and kinetic captions	Reachable	README: text clips with title styles and caption animations in the schema
Author animated SVG overlays	Reachable	README: agents can author .svg files; svg clip kind
Analyze a reference reel for beats and structure	Reachable	MCP tool fablecut_analyze_reference; POST /api/analyze
Export the finished video	Not reachable	README Notes: export runs in the browser; agents ask you to click Export or render with ffmpeg from media/
AI background removal	Not reachable	README: in-browser MediaPipe from the UI
Browse the asset library	Reachable	REST GET /api/library

Code stack

Languages: JavaScript
Frameworks: Node (no npm dependencies)ffmpegMediaPipe
Package manager: –
Database: none
Hosting target: localhost
Built: Unknown (recorded, never ranked)

Skills

A Claude Code plugin that drives FableCut to edit a video or remake a reel.

Kind: bundled
Paths: skills/edit-video/SKILL.md skills/remake-reel/SKILL.md
Install: /plugin marketplace add ronak-create/FableCut

Evidence and confidence

Field	Where it was seen	Confidence
formFactor	README: runs entirely in the browser at localhost:7777 behind node server.js	95%
executionModel	no model at runtime; MediaPipe cut-out is a bounded in-browser model	85%
operability	README: three equivalent control surfaces for agents (MCP, REST, file writes) alongside a complete GUI; mcp-server.js present in the first commit 2026-07-06; README Notes: export runs in the browser	80%
effort	README Quick start names FABLECUT_DATA_DIR, HOST, FABLECUT_ALLOWED_HOSTS, encoding-profiles.json, library/	90%
editions	README license: MIT; no paid edition	99%
active	GitHub pushedAt 2026-09-01	–
reach		85%

Open questions

Provenance: a single-author zero-dependency editor with an agent manual reads as agent-assisted; no Builder statement found

Sources

github.com/ronak-create/FableCut sourcing:video-streaming:curated
ronak-create.github.io/FableCut/ sourcing:video-streaming:curated