Edit agent-made videos through a JSON timeline with FableCut

FableCut is a small open-source video editor for teams experimenting with agent-driven media workflows. The useful idea is simple: the project timeline lives as JSON, the editor live-reloads when that file changes, and agents can work through MCP or REST instead of trying to click through a traditional nonlinear editor.

Use it when you want to prototype short videos, product clips, narrated demos, or social edits where an agent can plan the structure and update the timeline directly. It is especially interesting for creators who already use coding agents and want video editing to become a file-based workflow.

What to check

• Confirm the repo license and setup steps before using it in commercial work.
• Test with disposable media first, especially if an agent can edit local project files.
• Check the export path and whether your workflow needs server-side ffmpeg or browser-side rendering.
• Keep brand assets, client footage, and credentials outside any folder an autonomous agent can modify.

Source check

Confirmed by the GitHub repository: FableCut describes itself as a zero-dependency browser video editor with a JSON timeline, MCP/REST controls, and a live-reloading UI. Hacker News is useful context for community interest and early limitations, not the primary source.