Osc MCP Server

Declarative OSC bridge for music hardware and software — 849 synthesizer drivers (MIDI/SysEx) plus DAW & live-coding targets (Ableton, Bitwig

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What is the Osc MCP server?

Declarative OSC bridge for music hardware and software — 849 synthesizer drivers (MIDI/SysEx) plus DAW & live-coding targets (Ableton, Bitwig, Reaper, Sonic Pi, SuperCollider). Ships an MCP server: a MIDI MCP and OSC MCP for controlling. The osc mcp server wraps that behind the Model Context Protocol, so an assistant can use it through 6 defined tools rather than through you.

What it actually does

849 hardware synthesizers over MIDI / SysEx, plus DAWs and live-coding environments over OSC (Ableton, Bitwig, Reaper, Sonic Pi, SuperCollider, Pure Data, TouchDesigner, VCV Rack). Every device gets a clean, named OSC surface described by one JSON file. Drive it from a live-coding client, a DAW, a script, the CLI — or from Claude via the built-in MCP server (a MIDI MCP and OSC MCP).

  • CC / NRPN addresses are cryptic
  • SysEx byte formats are hand-rolled per device
  • Bidirectional state (what the device CURRENTLY knows) is hard to track

Its toolset

Everything the assistant can do here goes through one of these:

  • N-to — N orchestration.** One process can drive several synths at once (osc-bridge orchestrate --config bridge.toml), each reachable under its own OSC
  • First — class reconfigurable controllers (Electra One MK2).** Upload a generated preset as one OSC call; the bridge parses the JSON, reconfigures the device
  • Multi — block SysEx emission** (ob.emit_sysex) — the upload script emits
  • Status — Count
  • Send — Receive
  • Target — Mode

Adding it to your client

Installation goes through your MCP client rather than a global install: point it at @roomi-fields/osc-bridge on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.

When to reach for it

Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Osc's toolset — N-to, First, Multi and 3 more — is a fair guide to whether it matches your workflow. It is maintained by roomi-fields; worth a glance at recent repository activity before you build anything load-bearing on it.

SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.

Caveats

  • It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
  • MCP clients confirm each tool call by default. Leave that on until you have watched what the osc mcp server does with a few real requests.

Available tools

ToolWhat it does
N-toN orchestration.** One process can drive several synths at once (osc-bridge orchestrate --config bridge.toml), each reachable under its own OSC prefix — so two MatrixBrutes live side-by-side as /matrixbrute-1 and /matrix
Firstclass reconfigurable controllers (Electra One MK2).** Upload a generated preset as one OSC call; the bridge parses the JSON, reconfigures the device over SysEx, and *dynamically* rewires its own CC↔OSC routing so each kn
Multiblock SysEx emission** (ob.emit_sysex) — the upload script emits
StatusCount
SendReceive
TargetMode

How to install the Osc MCP server

{
  "mcpServers": {
    "osc-bridge": {
      "command": "npx",
      "args": ["-y", "@roomi-fields/osc-bridge"]
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Example prompts to try

  • Use Osc to N-to.
  • Use Osc to First.
  • Use Osc to Multi.

Frequently asked questions

It connects Osc to MCP-compatible AI assistants such as Claude and Cursor, exposing 6 tools (N-to, First, Multi, and more) that the assistant can call on your behalf. Instead of copying data back and forth by hand, the assistant works with Osc directly.