Your agents can process video at scale. No FFmpeg infrastructure to manage.

Go to renderio.dev/get-api-key and generate a free OAuth token.

{
  "mcpServers": {
    "renderio": {
      "serverInfo": {
        "type": "http",
        "url": "https://renderio.dev/api/mcp"
      },
      "headers": {
        "Authorization": "Bearer YOUR_OAUTH_TOKEN"
      }
    }
  }
}

Restart Windsurf after saving the config. Cascade will pick up the RenderIO tools on next launch.

Ask Cascade to resize a video then extract a thumbnail in one task. It calls run_chained_ffmpeg_commands — both steps run server-side with no intermediate downloads.

run_ffmpeg_command({
  ffmpeg_command: "-i {{in_video}} -vf \"crop=ih*9/16:ih:(iw-ih*9/16)/2:0,scale=1080:1920\" -c:a copy {{out_video}}",
  input_files: { in_video: "https://example.com/ugc.mp4" },
  output_files: { out_video: "vertical.mp4" }
})

run_ffmpeg_command({
  ffmpeg_command: "-i {{in_video}} -vf subtitles={{in_srt}} {{out_video}}",
  input_files: {
    in_video: "https://example.com/ugc.mp4",
    in_srt: "https://example.com/captions.srt"
  },
  output_files: { out_video: "captioned.mp4" }
})

run_ffmpeg_command({
  ffmpeg_command: "-i {{in_video}} -c:v libx264 -crf 28 -preset slow -c:a aac -b:a 128k {{out_video}}",
  input_files: { in_video: "https://example.com/ugc.mp4" },
  output_files: { out_video: "compressed.mp4" }
})

run_ffmpeg_command({
  ffmpeg_command: "-i {{in_video}} -ss 00:00:30 -to 00:01:00 -c copy {{out_clip}}",
  input_files: { in_video: "https://example.com/ugc.mp4" },
  output_files: { out_clip: "highlight.mp4" }
})

run_ffmpeg_command({
  ffmpeg_command: "-i {{in_video}} -ss 3 -vframes 1 -q:v 2 {{out_thumb}}",
  input_files: { in_video: "https://example.com/ugc.mp4" },
  output_files: { out_thumb: "thumbnail.jpg" }
})

Double-brace placeholders

The ffmpeg_command field uses {{key}} syntax. Single braces fail server-side validation before the sandbox ever runs.

Key prefix convention

All input_files keys must start with in_, all output_files keys with out_. Validated at the MCP layer.

Every key must appear in the command

Unused keys and missing placeholders both fail. The schema check catches this before FFmpeg runs.

Status values are uppercase

When calling get_command, always compare status as uppercase strings.

Output URL location

Each output file is an object with storage_url, filename, size_mbytes, and optionally duration, codec, width, height.