A real video editor — trim, grade, caption, mix, render — that an agent can edit beside you. Cut on the timeline, cut by editing the transcript, or drive the same actions from code. Every change is logged, every final render carries a receipt, and ordinary editing and rendering stay on your machine.
Free & open source (MIT) · Windows, macOS & Linux · local-first; optional online tools run only when you start them
Everything below is a real action in the app — and the same action an agent can call. There is one contract underneath the timeline, the transcript, the REST endpoint and the MCP tools: 264 verbs across 32 domains, all of it in the open.
Every action — yours or the agent's — is appended to a durable operation log the moment it happens, each entry carrying who did it, what changed, and why. The project file is only a cache rebuilt from that log. Close the laptop mid-edit, pull the power, crash the app: reopen and the work is exactly where you left it. Ctrl+S still works; it just forces a write the editor already did.
→ append-only · never rewritten · replayableUndo appends a new operation instead of erasing history, so nothing is lost. Guarded workflows checkpoint before they change the edit, and Review shows the exact diff of everything that happened since.
Cut speaks by deleting text. Transcription runs locally, then you remove silences, kill the filler words, drop a retake, or assemble a highlight reel straight out of the transcript — and it never cuts inside a word. Captions, subtitles and chapters come out of the same timing.
→ local models · word-level timing · no uploadSplit, ripple and lift delete, slip, slide and roll, linked picture and sound, multi-track layers, markers, speed changes, transitions and effects.
Layered grades on one clip, match a shot to a reference, or one-click neutralise a colour cast. Save a look and copy it across the edit.
Screen, microphone and system audio stay aligned through auto-edit and export. Separate raw streams and verified checkpoints make an interrupted recording recoverable.
Auto-reframe follows the subject instead of centre-cropping, and one window fans out into a per-platform delivery pack with a ready, needs-review, or blocked verdict.
Drop a music bed that ducks under speech, clean up a noisy voice track, set gain and pan per track, and normalise loudness on the way out.
A project-local Assets tray for this edit, plus a global library with folders, tags and favourites for everything you reuse.
Final Cut and Resolve XML, Premiere XML, OTIO, EDL, SRT, VTT, chapters, GIF, audio-only mixes, and platform export presets.
Choose the Claude Code, Codex, Grok, or Antigravity CLI already installed on your machine, then type what you want changed. The agent edits the real timeline — not an opaque generated movie, but ordinary operations you can inspect one by one. Each turn records the state it started from, exactly which operations it added, and whether it is still safe to roll the whole turn back. Preview it, read the diff, then accept, revert, or try again.
Antigravity Agent Chat is currently available on macOS and Linux.
The usual AI editing pitch ends with a file and a promise. Cut ends with evidence: what was changed, what was measured on the finished render, and what a reviewer actually saw. Nothing here claims a pass it did not earn.
Each operation stores the actor, arguments, rationale and a replayable result. History is appended, never rewritten — so the Review rail can reconstruct the edit and undo never quietly loses a step.
→ op 0142 edit.split you → op 0143 transcript.cut_words agent · "drop the second take" checkpoint · "before captions" diff> 7 ops · 2 tracks
A final render automatically runs an instrument battery over the edit, the measured media facts and the actual output file — cuts on word boundaries, loudness, captions present, black or frozen frames, silence at the edges, duration against the edit.
→ render.final h264 · 1920x1080 cut_on_word pass lufs -14.1 pass caption_presence pass black_or_frozen none receipt> written & readable
An optional review pass samples frames from the finished file and hands them to a subscription CLI you already have — Claude, Codex, Antigravity, then Grok — alongside the measured facts. No usable CLI means a plain "not run". It never manufactures a pass.
→ verify.judge sampled 12 frames facts: lufs · silences · timings verdict approve note: shot 3 holds ~2s long state> visual review · advisory
A factual rundown of ShellX Cut v0.6.109 — no jargon, updated every release.
The UI is a client, nothing more — it owns no state of its own and every control it renders dispatches a verb. So the timeline, the command line, the REST endpoint and the MCP tools all reach the same engine and the same open project. Point any MCP-capable coding agent at it, copy the config out of Settings, and press Test to prove it landed on the same running engine.
full surface @
the manual
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schema/verbs.json
Free and open source under MIT. No account to install. Projects, edits and normal renders stay local; optional provider workflows use only the CLI subscriptions and services you choose.