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Grandorgue MCP

GrandOrgue pipe organ simulator MCP server - MIDI bridge, organ control, sample set management, m...

Connector by sandraschi · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 4
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Works with Claude Desktop. Read the repository before you give any tool access to your data.

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MCP bundle (.mcpb): open it with Claude Desktop.

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About

GrandOrgue pipe organ simulator MCP server - MIDI bridge, organ control, sample set management, m...

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Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

Tools
12 read · 12 write · 3 delete · 7 not yet classified
Secrets
None asked for
Install scripts
None found
Runs as
Downloaded binary

Tools by what they do 34

Read from the source code; the running server may list different tools.

Read 12 · Look things up without changing anything.

  • go_bach_catalog
  • go_depot_card
  • go_list_midi_ports
  • go_list_organs
  • go_marketplace_download
  • go_marketplace_search
  • go_midi_playback_status
  • go_organs_card
  • go_status
  • go_status_card
  • midi_depot_download
  • midi_depot_list

Write 12 · Create, change, send or run things.

  • go_combination
  • go_midi_connect
  • go_midi_disconnect
  • go_panic
  • go_send_sysex
  • go_set_crescendo
  • go_set_enclosure
  • go_set_stop
  • go_start
  • go_stop_playback
  • midi_depot_download_bach
  • midi_depot_upload

Delete 3 · Delete, drop, revoke or wipe things.

  • go_stop
  • grandorgue_shutdown
  • midi_depot_delete

Not yet classified 7 · We could not tell from the name and description.

  • go_auto_load
  • go_load_organ
  • go_play_chord
  • go_play_midi_file
  • go_play_midi_file_ui
  • go_play_note
  • go_unload_organ

Network hosts it talks to 12

  • bachcentral.com · found in code
  • biomejs.dev · found in code
  • cdn.jsdelivr.net · found in code
  • classicalarchives.com · found in code
  • cli.github.com · found in code
  • familjenpalo.se · found in code
  • github.com · found in install command, code
  • glama.ai · found in code
  • kunstderfuge.com · found in code
  • mutopiaproject.org · found in code
  • ollama.com · found in code
  • piotrgrabowski.pl · found in code

Files it touches

  • %APPDATA%\com.sandraschi.pywinauto-mcp\logs\backend-spawn.log
  • Your home directory (~)
  • Any path the agent passes to its tools

Tools (34)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • go_auto_loadAuto-load last organ

    Load the last-used organ automatically (if one was saved from a previous session). ## Return Format {"success": bool, "organ": str|null, "message": str} ## Examples go_auto_load()

  • go_bach_catalogBach catalogread-only

    Search the J.S. Bach organ works catalog by BWV number. ## Return Format {"success": bool, "message": str, "works": [...], "total": int} ## Examples go_bach_catalog(bwv=565) go_bach_catalog()

  • go_combinationTrigger combination

    Trigger a combination (general piston) via MIDI Program Change. ## Return Format {"success": bool, "message": str, "number": int} ## Examples go_combination(number=3)

  • go_depot_cardDepot cardread-only

    Show a rich card of MIDI depot files with sizes. Works in clients that render MCP Apps / Prefab (e.g. Claude Desktop). Disable with ``GRANDORGUE_PREFAB_APPS=0`` (skips registration). ## Return Format ToolResult with text ``content`` plus a PrefabApp depot card. ## Examples go_depot_card()

  • go_list_midi_portsList MIDI portsread-only

    List all available MIDI input and output ports on the system. ## Return Format {"success": bool, "message": str, "inputs": [...], "outputs": [...]} ## Examples go_list_midi_ports()

  • go_list_organsList organsread-only

    List installed sample sets and known free catalogs. ## Return Format {"success": bool, "message": str, "installed": [...], "catalog": [...]} ## Examples go_list_organs()

  • go_load_organLoad organ

    Load an organ by path or name. Uses pywinauto-mcp for UI automation. Provide either the full .organ path or the organ name (matching the display name in GO's file-open dialog). If pywinauto-mcp is not running, registers the organ in the metadata registry and tells the user to load it in GO manually once. ## Return Format {"success": bool, "organ": {"name": str, "path": str}, "auto_loaded": bool} ## Examples go_load_organ(name="Burea Church") go_load_organ(path="C:/GrandOrgue/organs/Burea/Burea.organ")

  • go_marketplace_downloadSample set download inforead-only

    Get the download URL for a sample set by name. ## Return Format {"success": bool, "name": str, "url": str|null, "instructions": str} ## Examples go_marketplace_download(name="Burea Church")

  • go_marketplace_searchSearch sample setsread-only

    Search the GrandOrgue sample set marketplace by name, style, or builder. ## Return Format {"success": bool, "message": str, "results": [...], "total": int} ## Examples go_marketplace_search(query="Baroque")

  • go_midi_connectConnect MIDI bridge

    Create virtual MIDI ports and connect to GrandOrgue. ## Return Format {"success": bool, "message": str, "ports": {"input": str, "output": str}} ## Examples go_midi_connect()

  • go_midi_disconnectDisconnect MIDI bridge

    Close MIDI bridge connections. ## Return Format {"success": bool, "message": str} ## Examples go_midi_disconnect()

  • go_midi_playback_statusPlayback statusread-only

    Check if a MIDI file is currently playing through the MIDI bridge. ## Return Format {"success": bool, "message": str, "playing": bool} ## Examples go_midi_playback_status()

  • go_organs_cardOrgans cardread-only

    Show a rich card of installed organs plus the free catalog. Works in clients that render MCP Apps / Prefab (e.g. Claude Desktop). Disable with ``GRANDORGUE_PREFAB_APPS=0`` (skips registration). ## Return Format ToolResult with text ``content`` plus a PrefabApp organs card. ## Examples go_organs_card()

  • go_panicAll-notes-off panic

    Send all-notes-off / panic to GrandOrgue. ## Return Format {"success": bool, "message": str} ## Examples go_panic()

  • go_play_chordPlay chord

    Play a chord (multiple notes simultaneously). Defaults to C major. The release is scheduled in the background - the tool returns immediately. ## Return Format {"success": bool, "message": str, "notes": [...], "velocity": int} ## Examples go_play_chord(notes=[60, 64, 67], duration_ms=1500)

Show 19 more tools
  • go_play_midi_filePlay MIDI file

    Play a MIDI file through GrandOrgue's built-in MIDI player. Injects keystrokes (Alt+F, M, filename, Enter) via Windows API to trigger GO's File -> Load MIDI File menu. Plays through GO's pipe organ engine. No MIDI cables, no pywinauto, no external services needed. ## Return Format {"success": bool, "message": str} ## Examples go_play_midi_file(name="fugue1.mid")

  • go_play_midi_file_uiPlay MIDI file (UI)

    Play a MIDI file through GrandOrgue's built-in MIDI player via UI automation. Uses pywinauto to click File -> Load MIDI File -> select file. Requires pywinauto-mcp running. ## Return Format {"success": bool, "message": str} ## Examples go_play_midi_file_ui(name="bwv543.mid")

  • go_play_notePlay MIDI note

    Play a MIDI note through GrandOrgue. The note-off is scheduled in the background - the tool returns immediately. ## Return Format {"success": bool, "message": str, "note": int, "velocity": int, "channel": int} ## Examples go_play_note(midi_note=60, velocity=80, duration_ms=1000)

  • go_send_sysexSend SYSEX

    Send raw MIDI SYSEX data (hex string, e.g. 'F0 7D 10 ... F7'). ## Return Format {"success": bool, "message": str} ## Examples go_send_sysex(data_hex="F0 7D 01 00 F7")

  • go_set_crescendoSet crescendo

    Set crescendo pedal position (0-127). ## Return Format {"success": bool, "message": str, "value": int} ## Examples go_set_crescendo(value=64)

  • go_set_enclosureSet enclosure

    Set expression (swell) enclosure level via MIDI CC. ## Return Format {"success": bool, "message": str, "cc": int, "value": int} ## Examples go_set_enclosure(cc=7, value=80)

  • go_set_stopSet stop

    Set a stop (drawstop/tab) on or off via MIDI CC. ## Return Format {"success": bool, "message": str, "stop_cc": int, "state": bool} ## Examples go_set_stop(stop_cc=21, state=True)

  • go_startLaunch GrandOrgue

    Launch the GrandOrgue process. If an organ was previously loaded, attempts auto-reload. Pass organ_path to load directly via CLI (avoids pywinauto UI automation). ## Return Format {"success": bool, "message": str, "pid": int|null, "auto_loaded": str|null} ## Examples go_start() go_start(organ_path="C:/GrandOrgue/organs/Burea/Burea.organ")

  • go_statusOrgan statusread-only

    Get GrandOrgue process, MIDI, and organ status. ## Return Format {"success": bool, "message": str, "go_running": bool, "midi_connected": bool, "organ": {...}} ## Examples go_status()

  • go_status_cardStatus cardread-only

    Show a rich GrandOrgue status card (engine, MIDI bridge, organ). Works in clients that render MCP Apps / Prefab (e.g. Claude Desktop). Disable with ``GRANDORGUE_PREFAB_APPS=0`` (skips registration). ## Return Format ToolResult with text ``content`` plus a PrefabApp status card. ## Examples go_status_card()

  • go_stopStop GrandOrgue

    Terminate the GrandOrgue process. ## Return Format {"success": bool, "message": str} ## Examples go_stop()

  • go_stop_playbackStop playback

    Stop any active MIDI file playback and send all-notes-off. ## Return Format {"success": bool, "message": str} ## Examples go_stop_playback()

  • go_unload_organUnload organ

    Unload the current organ. ## Return Format {"success": bool, "message": str} ## Examples go_unload_organ()

  • grandorgue_shutdownShut down servercan change or delete data

    Gracefully shut down the GrandOrgue MCP server. Stops GrandOrgue, disconnects MIDI, and exits. Requires confirm=True. ## Return Format {"success": bool, "message": str} ## Examples grandorgue_shutdown(confirm=True)

  • midi_depot_deleteDelete from depotcan change or delete data

    Delete a MIDI file from the depot. ## Return Format {"success": bool, "message": str} ## Examples midi_depot_delete(name="fugue1.mid")

  • midi_depot_downloadDownload from depotread-only

    Download a MIDI file from the depot as base64. ## Return Format {"success": bool, "name": str, "data_base64": str, "size_bytes": int} ## Examples midi_depot_download(name="fugue1.mid")

  • midi_depot_download_bachDownload Bach bundle

    Download the complete J.S. Bach MIDI bundle (bachcentral.com) into the depot. Downloads bach.zip (~665 KB), extracts all .mid and .midi files into the depot. ## Return Format {"success": bool, "count": int, "files": [str], "message": str} ## Examples midi_depot_download_bach()

  • midi_depot_listList depotread-only

    List all MIDI files in the depot. ## Return Format {"success": bool, "files": [{"name": str, "size_bytes": int, "modified": float}]} ## Examples midi_depot_list()

  • midi_depot_uploadUpload to depot

    Upload a MIDI file to the depot. Provide file name and base64-encoded content. ## Return Format {"success": bool, "path": str} ## Examples midi_depot_upload(name="my.mid", data_base64="...")

Signals

Stars
4
Forks
0
Open issues
0
Last commit
Oct 24, 2026 (6 days ago)
Last release
Aug 28, 2026 (2 months ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
io.github.sandraschi/grandorgue-mcp
Version
0.3.0
Auth
No auth
Packages
mcpb https://github.com/sandraschi/grandorgue-mcp/releases/download/v0.3.0/grandorgue-mcp-v0.3.0.mcpb
License
MIT
Repository
github.com/sandraschi/grandorgue-mcp
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql

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Grandorgue MCP. Agent Mart. https://agentmart.dev/connectors/sandraschi-grandorgue-mcp (last updated 2026-10-24)