“Make a red subscribe button for 9:16 and save it as a green-screen MP4.”
“Put a lower third with my name on ~/Movies/intro.mp4 at 0:03.”
“Cut these three clips into one Reel, remove the pauses and add captions.”
“Put reference.mp4 on top, muted, me.mp4 on the bottom, crop 5% off the sides, start them together, Clean captions from my voice.”
“Make a five-frame rapid intro from grind.mp4, pour.mp4, stir.mp4, steam.mp4 and serve.mp4, then replay them with source timestamps and the labels “Grind beans”, “Pour water”, “Stir”, “Steam milk” and “Serve”, in 9:16.”
“Show me hook title overlays for a cooking channel.”
“Render the countdown overlay with a transparent background.”

Split-screen example

Pass this to edit_video, using your absolute local paths:

{
  "clips": [
    {"path":"/absolute/me.mp4","track":"v1","in":0,"out":6,"place":{"mode":"bottom"},"crop":{"top":0,"right":5,"bottom":0,"left":5}},
    {"path":"/absolute/reference.mp4","track":"v2","start":0,"in":0,"out":6,"place":{"mode":"top"},"crop":{"top":0,"right":5,"bottom":0,"left":5},"mute":true}
  ],
  "aspect": "9x16",
  "captions": {"style":"clean","position":"lower","size":"m"}
}

Every clip needs track. V1 plays in list order; V2 needs start in timeline seconds and cannot overlap another V2 clip. Crop removes source-edge percentages; omitted crop/place means zero crop/full picture. Captions and pause detection use V1 only. Pause removal cuts both tracks together; remove any named conflicting V1 transition before retrying. Align starts manually; this does not correct recording drift. Both 1080p and 720p are free under the overlay/caption rules below, up to 180 seconds across both tracks.

Rapid intro and titles example

A rapid intro opens with 5–7 teaser cuts of three to six frames each (default five), then replays the unchanged clips with a label and a timestamp over each. Give the descriptions yourself or tell your assistant what each clip shows: Modisign does not look at pictures. Titles are free and stay on your computer. The prompt above is one edit_video call:

{
  "clips": [
    {"path":"/absolute/grind.mp4","track":"v1","in":5,"out":9},
    {"path":"/absolute/pour.mp4","track":"v1","in":65,"out":69},
    {"path":"/absolute/stir.mp4","track":"v1","in":12,"out":16},
    {"path":"/absolute/steam.mp4","track":"v1","in":0,"out":4},
    {"path":"/absolute/serve.mp4","track":"v1","in":125,"out":129}
  ],
  "rapid_intro": {
    "clips": [0, 1, 2, 3, 4],
    "frames_per_clip": 5,
    "timestamp": "source",
    "labels": [
      {"clip":0,"text":"Grind beans"}, {"clip":1,"text":"Pour water"}, {"clip":2,"text":"Stir"},
      {"clip":3,"text":"Steam milk"}, {"clip":4,"text":"Serve"}
    ]
  },
  "texts": [{"text":"Coffee in five steps","start":0,"duration":2,"y":0.2}],
  "aspect": "9x16"
}

timestamp: "source" stamps each label with the clip's starting time in its source file (timeline uses the output time; none shows only the text). Teasers are muted unless mute_teasers is false. Every time you give for V2 clips, overlays or titles moves later by the intro's length, so give it as for the edit without the intro. The video must keep every clip at least as long as its teaser (3 frames, 0.1 seconds, is the shortest any clip can be).

Install

Claude Desktop

Add to claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/claude_desktop_config.json; Windows: %APPDATA%\Claude\claude_desktop_config.json), then restart:

{
  "mcpServers": {
    "modisign": { "command": "npx", "args": ["-y", "@modisign/mcp"] }
  }
}

Claude Code

Run this in your terminal; see Claude Code MCP setup.

claude mcp add --transport stdio modisign -- npx -y @modisign/mcp

Codex CLI and ChatGPT/Codex desktop

In the desktop app: Settings → MCP servers → Add server → STDIO, command npx, arguments -y @modisign/mcp, then save and restart; or run this in Codex CLI (setup).

codex mcp add modisign -- npx -y @modisign/mcp

Cursor

Put the Claude Desktop JSON above in ~/.cursor/mcp.json (global) or .cursor/mcp.json (project), then enable Modisign in MCP settings. Cursor MCP setup.

VS Code / Copilot

Create .vscode/mcp.json, then start the server and trust it when prompted (setup).

{
  "servers": {
    "modisign": { "type": "stdio", "command": "npx", "args": ["-y", "@modisign/mcp"] }
  }
}

Requirements

Node.js 22 or newer. FFmpeg on your PATH; your assistant can run this for you:

macOS: brew install ffmpeg
Windows: winget install Gyan.FFmpeg
Linux: sudo apt install ffmpeg

The first render downloads a private render browser once (about 100 MB). Linux ARM64: install Chromium instead (sudo apt install chromium). Run npx -y @modisign/mcp doctor to check your setup.

Free and Pro

One free preset per overlay type renders without an account; format and background changes stay free.
Customised overlays, Pro presets and expressive caption styles need Pro.
Video edits with no overlays or only free presets and Clean, Boxed or Minimal captions are free, including titles and the rapid intro.
Pro is $9/month: Pricing. Sign in with npx -y @modisign/mcp login.

Privacy

Your videos, photos and audio never leave your computer.
Only overlay settings, overlay text and the chosen caption style reach Modisign.
Titles and rapid-intro labels never reach Modisign; your assistant sees them in the request.
Captions are made on your computer with an English speech model downloaded once from Hugging Face (about 43 MB).
Anonymous usage counts have no account link; turn them off with MODISIGN_NO_TELEMETRY=1.

Full details: https://modisign.app/privacy and TECHNICAL.md.

Commands

Run commands with npx -y @modisign/mcp <command>.

Command	What it does
`login`	Sign in to Modisign in your browser.
`logout`	Sign out on this computer.
`status`	Check your sign-in and Pro access.
`doctor`	Check your setup.
`render <family>/<preset>`	Save an overlay as MP4, MOV or WebM.

License

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Package last updated on 20 Oct 2026

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Modisign MCP

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