Model Context Protocol - Functional Mock-up Interface
Makes your simulation models available as tools for LLM-based agents.

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Prerequisites

• Python 3.11 or higher
• uv package manager
• Claude Desktop (for desktop integration)

Claude Desktop Integration

Update the claude_desktop_config.json file with:

{
  "mcpServers": {
    "MCP-FMI Server": {
      "command": "uvx",
      "args": [
        "mcp-fmi",
        "--fmu-dir",
        "/full/path/to/fmu/folder"
        ],
    }
  }
}

Example usage

Example queries:

• What simulation models do you have available?
• Give me informaiton of input and output signals of model model name.
• Who created the model model name and when was it last updated?
• Make a step-change in input input name at 60s. Keep the other inputs constant with default values.
• Simulate model name with generated inputs.

MCP - Functional Mockup Interface

This package integrates FMU simulation models as tools for LLM-based agents through the MCP. This is an unofficial MCP-integration of the FMPy package.

The Model Context Protocol (MCP) is an open protocol that standardizes how applications can provide context to Large Language Models (LLMs). MCP helps when integrating data and tools to LLM-based agents.

Architecture

The Functional Mockup Interface (FMI) is a free standard that defines a container and interface to exchange dynamic simulation models across simulation platforms. A Functional Mockup Unit (FMU) is a file containing a simulation model that adheres to the FMI standard.

MCP-FMI Features

• Manage simulations from chat interfaces.
• Use simulation models as tools for LLM-based agents.
• Generate input signals for simulations from natural language.
• Visualize simulation results in browser.

Implemented tools

List of implemented tools:

• fmu_information_tool retrieves information about the available FMU models.
• simulate_toolsimulates a single FMU model with default prameters and input signals. Returns the simulated outputs.
• simulate_with_input_tool simulates a single FMU model with the specified input signals. Returns the simulated outputs.
• create_signal_tool generates an input-sequence object for a single input.
• merge_signals_tool merges multiple signel objects that can be used as an input for a simulation.
• show_results_in_browser_tool visualizes simulation results in browser.

Tool Overview

Future work

List of tools to be implemented:

• show_results_as_artifact_tool visualized simulation results as interractive artifacts in Claude Desktop.
• co_simulate_tool co-simulates multiple FMU models.

Citation

If you use this package in your research, please cite it using the following BibTeX entry:

@misc{MCP-FMI,
  author = {Mikael Manngård, Christoffer Björkskog},
  title = {MCP-FMI: MCP Server for the Functional Mock-Up Interface},
  year = {2025},
  howpublished = {\url{https://github.com/Novia-RDI-Seafaring/mcp-fmi}},
}

Acknowledgements

This work was done in the Business Finland funded project Virtual Sea Trial

License

This package is licensed under the MIT License license. See the LICENSE file for more details.