A video editor your agent controls over MCP

Connect any agent

In Zylcut, open Settings > Agents and press Connect next to your agent. For any other MCP client, paste one message into its chat, or add one entry to its config:

{
  "mcpServers": {
    "zylcut": { "command": "/Users/YOU/.local/bin/zylcut", "args": ["mcp"] }
  }
}

That command is a small stdio bridge Zylcut installs. It starts Zylcut when it is not running, reads the access key itself, and replays the session if the app restarts. Connect your agent has the message to paste and the exact config for Antigravity, VS Code with GitHub Copilot, Cursor, Claude Code, Codex and others, on macOS, Windows and Linux. Clients that only speak HTTP can use the Streamable HTTP server the app runs on 127.0.0.1.

The edit is source code

A Zylcut project is a folder, and the edit is one file in it, index.tsx: a JSX composition of scenes, clips, text and captions with explicit timing. An agent edits it with the same file tools it uses for code, and Zylcut recompiles on save. When you change something on the timeline, Zylcut rewrites the same lines, so the agent and you always work on one copy. The user_edits tool tells the agent what you changed by hand since it last looked.

<scene id="main" active width={1920} height={1080}>
  <video id="a1" src="assets/talk.mp4" end={10.2} />
  <captions id="c1" src="assets/talk.json" preset="spotlight" end={10.2} />
  <video id="a2" src="assets/talk.mp4" start={10.2} sourceIn={12.6} />
  <captions id="c2" src="assets/talk.json" preset="spotlight" start={10.2} sourceIn={12.6} />
</scene>

Tools that let an agent see and hear

Editing blind is how agents make bad cuts, so most of Zylcut's tools exist to give the agent facts. It reads word-timed transcripts instead of guessing, looks at waveforms and beats, searches footage by description, and renders real frames to check its work before it reports back.

• Projects: projects, open, context, check, capture, review, export, export_jobs, audio_duck, audio_enhance, user_edits, versions
• Footage: media_probe, media_grab, media_filmstrip, media_waveform, media_beats, media_transcribe, media_listen, media_segment, footage_index, footage_search
• Sourcing: media_stock_search, media_stock_download, media_search, media_download, media_credits, sfx_list, sfx_render
• Voice and script: voices, voiceover, script, script_write, script_voice
• App and memory: fonts, logs, screenshot, whoami, models, feedback, memory, skill, chat_search

Transcription, footage search, silence detection, segmentation and export run on your computer. The full reference ships with the app.

Built for checking, not trusting

• check reports black frames, missing media, clipping and loudness problems, and timing that is valid but seldom meant.
• capture renders contact sheets of real frames, the same frames the export will write.
• versions keeps a history of the project, saved before and after every agent turn, so any change can be rolled back.

New to Zylcut? Start with the overview, or see the walkthrough for editing with Claude Code.

Questions