Streamdeck MCP Server

Stream Deck MCP

AI-first MCP server for Elgato Stream Deck profile management. The default server writes directly to the Stream Deck desktop app's native profile files, and the original USB-direct server is still available as a legacy fallback.

Installation

Default: Desktop Profile Writer

The default packaged entrypoint is the profile writer. It edits ProfilesV3 when present, then falls back to ProfilesV2.

uvx streamdeck-mcp

Local Repo Configuration

{
  "mcpServers": {
    "streamdeck": {
      "command": "uv",
      "args": [
        "--directory",
        "/path/to/streamdeck-mcp",
        "run",
        "profile_server.py"
      ]
    }
  }
}

Legacy USB Server

If you still want direct hardware control that bypasses the Elgato app entirely, keep using the legacy server:

{
  "mcpServers": {
    "streamdeck-usb": {
      "command": "uv",
      "args": [
        "--directory",
        "/path/to/streamdeck-mcp",
        "run",
        "server.py"
      ]
    }
  }
}

Or use the packaged legacy entrypoint:

uvx --from streamdeck-mcp streamdeck-mcp-usb

Default Tools

How the Profile Writer Works

• ProfilesV3 is preferred when it exists because page UUIDs map cleanly to directories.
• ProfilesV2 is still supported, but existing pages should be targeted by directory_id or page_index because Elgato stores opaque page directory names there.
• streamdeck_write_page can accept raw native action objects, or use convenience fields like path, action_type, plugin_uuid, and action_uuid.
• Generated icons are stored in ~/.streamdeck-mcp/generated-icons/.
• Generated shell scripts are stored in ~/StreamDeckScripts/.
• The bundled streamdeck-mcp Stream Deck plugin is installed into the Stream Deck Plugins directory (e.g., ~/Library/Application Support/com.elgato.StreamDeck/Plugins/ on macOS, %APPDATA%\Elgato\StreamDeck\Plugins\ on Windows) once installed. It's a minimal shell whose only job is to declare encoder support so per-instance Encoder.Icon / Encoder.background writes survive an Elgato app restart. streamdeck_write_page installs it automatically the first time an encoder button needs it.

Editing Workflow (Important)

The Elgato desktop app keeps every profile in memory and rewrites the on-disk manifests from that snapshot when it quits, so any edit made while the app is running is wiped the next time it closes. The profile writer enforces a quit → write → relaunch cycle:

1. Ensure the Elgato app is not running, or pass auto_quit_app: true to streamdeck_write_page to have it quit the app for you (AppleScript first, killall fallback).
2. Make as many streamdeck_write_page calls as you need — the app stays quit across them.
3. Call streamdeck_restart_app when you are done. The device re-reads the manifests on launch and your changes appear.

streamdeck_write_page raises a StreamDeckAppRunningError when the app is running and auto_quit_app is not set, so you cannot accidentally write changes that will be silently discarded.

If your Elgato app is installed somewhere other than /Applications/Elgato Stream Deck.app, set STREAMDECK_APP_PATH to the bundle path.

Usage Notes

• streamdeck_create_action is the safest way to build shell-command buttons because it writes a standalone script and returns the native Open action block for it.
• The profile writer does not require exclusive USB access.

Legacy USB Tools

The original USB-direct server is preserved for backwards compatibility. It still provides:

• streamdeck_connect
• streamdeck_info
• streamdeck_set_button
• streamdeck_set_buttons
• streamdeck_clear_button
• streamdeck_get_button
• streamdeck_clear_all
• streamdeck_set_brightness
• streamdeck_create_page
• streamdeck_switch_page
• streamdeck_list_pages
• streamdeck_delete_page
• streamdeck_disconnect

Use that mode only when you want the MCP server to own the hardware directly and the Elgato desktop app is not running.

Development

uv venv
uv pip install -e ".[dev]"
uv run pytest tests/ -v
uv run ruff check .

To audit this repo against the shared Very Good Plugins MCP standards:

../mcp-ecosystem/scripts/audit-server.sh .

Support

For issues, questions, or suggestions:

• Open an issue on GitHub
• Contact Very Good Plugins

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