@crabcut/mcp-server

@crabcut/mcp-server

Turn YouTube videos into short clips -- from Claude, Cursor, or any AI assistant that supports MCP.

You give it a YouTube link. It finds the best moments, reframes them for vertical video (9:16), adds subtitles, and gives you download links. All from a chat or automation workflow.

Quick Start

• Get an API key at app.crabcut.ai/developers
• Run:

CRABCUT_API_KEY=sk_live_... npx @crabcut/mcp-server

That's it. The server connects via stdio and works with any MCP client.

Setup

Claude Desktop

Add this to your Claude config (claude_desktop_config.json):

{
  "mcpServers": {
    "crabcut": {
      "command": "npx",
      "args": ["@crabcut/mcp-server"],
      "env": {
        "CRABCUT_API_KEY": "sk_live_..."
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project:

{
  "mcpServers": {
    "crabcut": {
      "command": "npx",
      "args": ["@crabcut/mcp-server"],
      "env": {
        "CRABCUT_API_KEY": "sk_live_..."
      }
    }
  }
}

Smithery

npx @smithery/cli mcp add crabcut/crabcut-mcp-server

Remote (Streamable HTTP)

For n8n, custom integrations, or any client that supports remote MCP:

• Endpoint: https://mcp.crabcut.ai/mcp
• Auth: Authorization: Bearer sk_live_...
• Transport: Streamable HTTP (POST)

Tools

Tool	What it does
generate_clips	Start clip generation from a YouTube URL. Returns a project_id right away.
get_project_status	Check progress and get clips when ready. Clips are sorted by score (best first).
list_projects	List your projects with status and clip counts.
get_clip	Get full details for a single clip.
check_usage	See your plan, remaining credits, and usage.

How It Works

Clip generation takes a few minutes. Here is the flow:

• Call generate_clips with a YouTube URL
• You get back a project_id immediately
• Wait for results using one of two methods (polling or webhook)
• When done, you get an array of clips sorted by score (best first), each with a download_url

Project Statuses

As your project moves through the pipeline, status changes:

status	Meaning
pending	Job is queued, not started yet
processing	Video is being downloaded, analyzed, or clips are being cut/exported
completed	All clips are exported and ready to download
completed_no_clips	Processing finished but no good clips were found
failed	Something went wrong (check error field)

The step field gives more detail during processing:

step	Meaning
queued	Waiting to start
DOWNLOADING_VIDEO	Downloading from YouTube
EXTRACTING_AUDIO	Extracting audio for transcription
TRANSCRIBING	Transcribing speech to text
DETECTING_HIGHLIGHTS	AI is finding the best moments
CUTTING_CLIPS	Creating individual clips
EXPORTING_CLIPS	Rendering final videos with subtitles
done	Everything is finished

Clip Statuses

Each clip in the response has its own clip_status:

clip_status	Meaning
pending	Clip is created, export not started yet
exporting	Video is being rendered with subtitles
completed	Ready -- download_url is available
failed	Export failed for this clip

API Reference

generate_clips

Start clip generation from a YouTube video.

Input:

Field	Type	Required	Description
url	string	Yes	Full YouTube video URL
start_time	number	No	Start time in seconds (to process only a segment)
end_time	number	No	End time in seconds (to process only a segment)
callback_url	string	No	Webhook URL to receive results when done

Response:

{
  "project_id": "43dbe622-8ac6-4579-9625-0ad7f0f9db0b",
  "status": "processing",
  "poll_url": "/api/v1/projects/43dbe622-8ac6-4579-9625-0ad7f0f9db0b",
  "estimated_minutes": 5,
  "message": "Processing started. Poll with get_project_status every 10-15 seconds until status is 'completed'."
}

get_project_status

Check progress and get clips. Poll every 10-15 seconds.

Input:

Field	Type	Required	Description
project_id	string	Yes	The project ID from generate_clips

Response (while processing):

{
  "id": "43dbe622-8ac6-4579-9625-0ad7f0f9db0b",
  "name": "Video Title",
  "status": "processing",
  "step": "CUTTING_CLIPS",
  "error": null,
  "expected_clips": 9,
  "duration": 639,
  "created_at": "2026-03-15T02:21:46.226Z",
  "clips": [
    {
      "id": "a567a875-...",
      "title": "They Overthink a Chair Like a Crisis",
      "duration": 29.19,
      "score": 74,
      "reason": "Focused on one absurd premise with escalating comedy.",
      "clip_status": "exporting",
      "download_url": null,
      "quality": "1080p",
      "thumbnail_url": null,
      "created_at": "2026-03-15T02:27:16.629Z",
      "updated_at": "2026-03-15T02:27:16.666Z"
    }
  ]
}

Response (when completed):

{
  "id": "43dbe622-8ac6-4579-9625-0ad7f0f9db0b",
  "name": "Video Title",
  "status": "completed",
  "step": "done",
  "error": null,
  "expected_clips": 9,
  "duration": 639,
  "created_at": "2026-03-15T02:21:46.226Z",
  "clips": [
    {
      "id": "32538b9c-...",
      "title": "One Dating Theory Leads to Chaos",
      "duration": 41.83,
      "score": 90,
      "reason": "Sharp universal joke that hooks instantly with strong reactions.",
      "clip_status": "completed",
      "download_url": "https://cdn.crabcut.ai/exports/premium/.../clip-32538b9c-....mp4",
      "quality": "1080p",
      "thumbnail_url": "https://cdn.crabcut.ai/exports/premium/.../clip-32538b9c-...-thumb.jpg",
      "created_at": "2026-03-15T02:29:10.954Z",
      "updated_at": "2026-03-15T02:30:43.907Z"
    },
    {
      "id": "a567a875-...",
      "title": "They Overthink a Chair Like a Crisis",
      "duration": 29.19,
      "score": 74,
      "reason": "Focused on one absurd premise with escalating comedy.",
      "clip_status": "completed",
      "download_url": "https://cdn.crabcut.ai/exports/premium/.../clip-a567a875-....mp4",
      "quality": "1080p",
      "thumbnail_url": "https://cdn.crabcut.ai/exports/premium/.../clip-a567a875-...-thumb.jpg",
      "created_at": "2026-03-15T02:27:16.629Z",
      "updated_at": "2026-03-15T02:28:22.816Z"
    }
  ]
}

Clips are sorted by score (highest first). The first clip in the array is the best one.

list_projects

List your projects.

Input:

Field	Type	Required	Description
limit	number	No	Max projects to return. Default 20, max 100.
status	string	No	Filter by status: pending, processing, completed, completed_no_clips, failed

Response:

{
  "projects": [
    {
      "id": "43dbe622-...",
      "name": "Video Title",
      "status": "completed",
      "step": "done",
      "expected_clips": 9,
      "clips_count": 8,
      "duration": 639,
      "created_at": "2026-03-15T02:21:46.226Z"
    }
  ],
  "total": 1,
  "limit": 20,
  "offset": 0
}

get_clip

Get full details for a single clip.

Input:

Field	Type	Required	Description
clip_id	string	Yes	The clip ID from a project's clips array

Response:

{
  "id": "32538b9c-...",
  "project_id": "43dbe622-...",
  "title": "One Dating Theory Leads to Chaos",
  "duration": 41.83,
  "score": 90,
  "reason": "Sharp universal joke that hooks instantly.",
  "export_status": "completed",
  "export_quality": "1080p",
  "is_exported": true,
  "video_url": "https://cdn.crabcut.ai/...",
  "video_url_720p": "https://cdn.crabcut.ai/...",
  "video_url_1080p": "https://cdn.crabcut.ai/...",
  "thumbnail_url": "https://cdn.crabcut.ai/...",
  "created_at": "2026-03-15T02:29:10.954Z",
  "updated_at": "2026-03-15T02:30:43.907Z"
}

check_usage

Check your credits and plan.

Input: None.

Response:

{
  "plan": "pro",
  "credits_remaining": 450,
  "credits_total": 500,
  "period_start": "2026-03-01T00:00:00.000Z",
  "period_end": "2026-04-01T00:00:00.000Z"
}

Error Responses

When something goes wrong, the API returns an error object:

{ "error": "Insufficient credits", "required": 10, "available": 3 }

Common errors:

HTTP Status	Error	What to do
400	Invalid YouTube URL	Check the URL format
401	Unauthorized	Check your API key
402	Insufficient credits	Buy more credits or use a shorter video
429	Rate limit exceeded	Wait and try again
500	Internal server error	Try again later

Callback Webhook

Pass a callback_url when calling generate_clips. We will POST to that URL when all clips are exported and ready.

Payload:

{
  "event": "project.completed",
  "project_id": "43dbe622-...",
  "status": "completed",
  "source_url": "https://www.youtube.com/watch?v=H51iLa1leOU",
  "clips": [
    {
      "id": "32538b9c-...",
      "title": "One Dating Theory Leads to Chaos",
      "duration": 41.83,
      "score": 90,
      "download_url": "https://cdn.crabcut.ai/exports/premium/.../clip-32538b9c-....mp4",
      "thumbnail_url": "https://cdn.crabcut.ai/exports/premium/.../clip-32538b9c-...-thumb.jpg",
      "quality": "1080p"
    }
  ]
}

For failed projects:

{
  "event": "project.failed",
  "project_id": "43dbe622-...",
  "status": "failed",
  "source_url": "https://www.youtube.com/watch?v=...",
  "error": "YouTube video is unavailable",
  "clips": []
}

Clips are sorted by score (highest first). We retry the webhook up to 3 times if your server doesn't respond.

Verifying webhooks (optional): Each callback includes an X-Crabcut-Signature header. To verify it came from Crabcut:

• Compute SHA-256 of your API key to get your signing key
• Compute HMAC-SHA256 of the raw request body using that signing key
• Compare with the header value (format: sha256=<hex>)

This step is optional. If you skip it, everything still works.

Using with n8n

There are two ways to set this up in n8n:

Option A -- Webhook (recommended):

• Create a new workflow with a Webhook trigger node. Copy its URL (e.g. https://your-n8n.com/webhook/abc123).
• Add an HTTP Request node:
  • Method: POST
  • URL: https://api.crabcut.ai/api/v1/clips/generate
  • Authentication: Header Auth
  • Header Name: Authorization
  • Header Value: Bearer sk_live_...
  • Body (JSON):

    {
      "url": "https://www.youtube.com/watch?v=...",
      "callback_url": "https://your-n8n.com/webhook/abc123"
    }
    

• When clips are ready, the Webhook node receives the payload and your workflow continues.
• Access the best clip: {{ $json.clips[0].download_url }}

Option B -- Polling loop:

• HTTP Request node: POST https://api.crabcut.ai/api/v1/clips/generate with body {"url": "..."}. Same auth as above.
• Wait node: 15 seconds.
• HTTP Request node: GET https://api.crabcut.ai/api/v1/projects/{{ $json.project_id }}
• IF node: if {{ $json.status }} is not completed, loop back to the Wait node.
• When complete, the response includes all clips with download URLs.
• Access the best clip: {{ $json.clips[0].download_url }}

Tips for n8n:

• clips is sorted by score. Index 0 is always the best clip.
• Use {{ $json.clips.length }} to check how many clips were generated.
• Each clip has a clip_status. You can filter for only completed clips.
• Free plans export at 720p. Pro plans export at 1080p.

REST API

If you want to call the API directly (without MCP), here are the endpoints:

Method	Endpoint	Description
POST	https://api.crabcut.ai/api/v1/clips/generate	Start clip generation
GET	https://api.crabcut.ai/api/v1/projects/:id	Get project status and clips
GET	https://api.crabcut.ai/api/v1/projects	List projects
GET	https://api.crabcut.ai/api/v1/clips/:id	Get single clip details
GET	https://api.crabcut.ai/api/v1/account/usage	Check credits and plan

All endpoints require the header: Authorization: Bearer sk_live_...

Billing

Each minute of source video costs credits. A 10-minute video costs more credits than a 2-minute video. Check your balance with check_usage. Get credits at crabcut.ai/pricing.

Environment Variables

Variable	Required	Default
CRABCUT_API_KEY	Yes	--
CRABCUT_API_URL	No	https://api.crabcut.ai

Links

• Website: crabcut.ai
• Get your API key: app.crabcut.ai/developers
• REST API base: https://api.crabcut.ai/api/v1

License

MIT