Multisim Native MCP

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Native circuit editing and analog analysis for NI Multisim through the Model Context Protocol.

• 44 MCP tools for components, wires, sheets, subcircuits, models and analysis.

• Editable .ms14 projects with named-pin connections and routed wire branches.

• Batch edits, checkpoints, undo, redo and native save/reopen.

• DC operating point and transient analog analysis with RAW and CSV output.

• Schematic export to PNG and BMP.

• Windows installer with automatic Python setup and Codex configuration.

Requirements

Related MCP server: kicad-forge

Install

Run in PowerShell:

irm https://raw.githubusercontent.com/y-wi/multisim-native-mcp/v0.2.1/install.ps1 | iex

Restart Codex. The server appears as multisim_native.

To install from a checkout:

git clone https://github.com/y-wi/multisim-native-mcp.git
cd multisim-native-mcp
powershell -ExecutionPolicy Bypass -File .\install.ps1

For a custom Multisim installation directory:

.\install.ps1 -MultisimPath 'D:\Applications\NI\Circuit Design Suite 14.3'

Other MCP clients

Install with -Client none to print the JSON configuration:

.\install.ps1 -Client none

The installed command also exports client configuration:

& "$env:LOCALAPPDATA\MultisimNativeMCP\bin\multisim-native-mcp.exe" config

Add the resulting mcpServers.multisim_native entry to your client's MCP configuration.

Install with uv

uv tool install --python cpython-3.12-windows-x86-none https://github.com/y-wi/multisim-native-mcp/releases/download/v0.2.1/multisim_native_mcp-0.2.1-py3-none-any.whl
multisim-native-mcp doctor
multisim-native-mcp configure

Use

Start with one of these requests in your MCP client:

Create a 12 V voltage divider with two 1 kΩ resistors. Connect the named pins, check the netlist, save the circuit and export a PNG.

Open a copy of my Multisim project. List the components and pin names, replace R2 with 2.2 kΩ and save a new project.

Move R1 and keep its wires attached. Add a branch at the midpoint of the output wire, then save and reopen the circuit.

Edit an existing project

1. native_open_copy — open a working copy.

2. native_list_components — read the component references and exact pin names.

3. Edit components and connections.

4. native_check_netlist — check the electrical netlist.

5. native_save_copy — save the resulting .ms14 file.

6. native_close_copy — close the session.

Use native_attach with a process ID to work in an existing Multisim window. Closing an attached session releases the connection and leaves that window open.

Connect a wire branch

1. Read the route with native_list_wires.

2. Call native_split_wire at a point on the route.

3. Connect the returned junction_id with native_connect_endpoints.

Read component and wire IDs again after undo, redo or a netlist check that returns handles_invalidated: true.

Tools

Tool reference · Python example

Configuration

Run multisim-native-mcp doctor to check the Python architecture, package resources and Multisim modules. configure preserves the other Codex settings and creates a timestamped backup when updating an existing configuration.

Development

uv venv --python cpython-3.12-windows-x86-none
uv pip install -e '.[dev]'
.\.venv\Scripts\python.exe -m pytest -m 'not native'
.\.venv\Scripts\python.exe -m pytest -m native
uv build

Native tests use the installed Multisim runtime. Close Multisim before running them.

License

FSF All-Permissive License.