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capcut-mcp

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MCP server that lets Claude read and edit CapCut desktop drafts — add/move/trim/split clips, text, audio; validate & save safely. Free & open source.

capcut-mcp

An MCP server that lets Claude read and edit CapCut desktop draft projects — add/move/trim/split clips, text, audio, images; set transforms; validate; save. It works by cloning real segment/material templates out of an existing draft (the only reliable way to produce valid CapCut JSON), and it saves atomically with a backup and a validation pass.

Free & open source (MIT). Built by James Aldrin Boncales for editors who want Claude to drive CapCut for them.

Not affiliated with CapCut or ByteDance. CapCut's draft format is proprietary and undocumented; this tool reads/writes it defensively (clone-from-template, backups, validation), but a CapCut update can shift the schema. Keep the backups it makes.

Requirements

  • Node 18+
  • ffmpeg/ffprobe on PATH (used to read media duration/resolution)
  • CapCut desktop (Windows layout assumed; macOS path is auto-detected too)

Configure (env, optional)

  • CAPCUT_DRAFTS_DIR — your CapCut Drafts folder. Auto-detects the standard %LOCALAPPDATA%\CapCut\... (Windows) / ~/Movies/CapCut/... (macOS) locations; set this if your drafts live elsewhere (e.g. a different drive).
  • CAPCUT_TEMPLATE_DRAFT — name of a draft that contains video and text layers, used to harvest templates when the draft you're editing lacks one. Default 0723 is the author's own draft and won't exist on your machine — set this to one of your drafts that has a text layer, or the capcut_add_text tool won't work. (Everything else works without it.)

Install

git clone https://github.com/JmsLdrn/capcut-mcp
cd capcut-mcp
npm install

Then register it in Claude Code — use the absolute path to src/server.js on your machine:

claude mcp add capcut --scope user -- node "/ABSOLUTE/PATH/TO/capcut-mcp/src/server.js"

…or add a project-scoped .mcp.json at your repo root (copy mcp.json.example and edit the paths):

{
  "mcpServers": {
    "capcut": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/capcut-mcp/src/server.js"],
      "env": { "CAPCUT_DRAFTS_DIR": "", "CAPCUT_TEMPLATE_DRAFT": "" }
    }
  }
}

Leave the env values blank to auto-detect, or fill them in (see Configure above). Restart Claude Code; the tools then appear as mcp__capcut__*.

Workflow (important)

  1. Close CapCut on the draft you want to edit. CapCut autosaves on a timer; writing while it's open gets clobbered. capcut_save refuses if CapCut is running or the draft's .locked file is present (override with force: true only if you know it's safe).
  2. Edits are a session: capcut_add_* / capcut_move_* etc. accumulate in memory. Nothing hits disk until capcut_save.
  3. capcut_save writes draft_content.json (+ meta) atomically after making a .mcpbak backup, and runs capcut_validate.
  4. Reopen the draft in CapCut.

All times at the tool boundary are in seconds (converted to CapCut's microseconds internally).

Tools

Tool Purpose
capcut_list_drafts list drafts + duration + lock status
capcut_read_timeline full read: canvas, fps, tracks, every segment
capcut_clone_draft copy a draft (optionally emptied) for a fresh build
capcut_add_video / _image / _audio place media at a time on a track
capcut_add_text text overlay (needs a text template draft)
capcut_add_track new video/audio/text/sticker track
capcut_move_segment change start time / track
capcut_trim_segment change start / duration / source in-point
capcut_split_segment split at a time
capcut_delete_segment remove
capcut_set_props scale / position / rotation / opacity / volume / speed / visibility
capcut_raw_patch advanced deep-merge escape hatch for undocumented ops
capcut_validate overlaps, duplicate ids, missing media
capcut_save / capcut_discard persist / drop the session

Companion skill

A Claude skill ships in skills/capcut-reels/. It teaches Claude the full production pipeline these tools were built for — record → captions (WhisperFlow) → motion graphics (HyperFrames) → probe/render (ffprobe/ffmpeg) → assemble & caption the CapCut draft via this MCP. Copy the capcut-reels folder into your Claude skills directory to install it.

Guardrails

  • Won't save while CapCut is open (autosave clobber protection).
  • .mcpbak backup + atomic temp-then-rename write.
  • Post-edit validation (overlaps, duplicate material ids, layer-order clashes, missing media).
  • New drafts are cloned from a known-good base, never built from an empty object.

Limitations (be honest with these)

  • CapCut's draft format is proprietary and undocumented, and changes between CapCut versions. This server is defensive (clone-from-template, backup, validate) but a CapCut update can still shift the schema — keep the backups.
  • Effects, transitions, animations, and rich text styling are best-effort. The well-understood ops (place/move/trim/split media + basic text + transforms) are solid; anything exotic should go through capcut_raw_patch against a template you've inspected.
  • capcut_add_text needs a draft with a text layer to harvest from (CAPCUT_TEMPLATE_DRAFT).

Architecture

  • src/core.js — pure engine (CapCutDraft class + cloneDraft/listDrafts). Testable without MCP.
  • src/server.js — thin MCP stdio server; declares the tools and calls the core.

License & credits

MIT © 2026 James Aldrin Boncales. Contributions and issues welcome. If this saves you time, a link back to jmsldrn.com is appreciated — not required.

Always keep a copy of important drafts before batch-editing. This software is provided "as is", without warranty.

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