PyMOL-MCP: Integrating PyMOL with Claude AI
PyMOL-MCP connects PyMOL to Claude AI through the Model Context Protocol (MCP), enabling Claude to directly interact with and control PyMOL. This powerful integration allows for conversational structural biology, molecular visualization, and analysis through natural language.
https://github.com/user-attachments/assets/687f43dc-d45e-477e-ac2b-7438e175cb36
Features
- Two-way communication: Connect Claude AI to PyMOL through a socket-based server
- Intelligent command parsing: Natural language processing for PyMOL commands
- Molecular visualization control: Manipulate representations, colors, and views
- Structural analysis: Perform measurements, alignments, and other analyses
- Code execution: Run arbitrary Python code in PyMOL from Claude
Installation Guide
Prerequisites
- PyMOL installed on your system
- Claude for Desktop
- Python 3.10 or newer
- Git
Step 1: Install the UV Package Manager
On macOS:
brew install uv
On Windows:
powershell -c "irm https://astral.sh/uv/install.ps1 | iex"
set Path=C:\Users\[YourUsername]\.local\bin;%Path%
For other platforms, visit the UV installation guide.
Step 2: Clone the Repository
git clone https://github.com/vrtejus/pymol-mcp
cd pymol-mcp
Step 3: Set Up the Environment
Create and activate a Python virtual environment:
python -m venv venv
On macOS/Linux:
source venv/bin/activate
On Windows:
venv\Scripts\activate
Step 4: Install Dependencies
With the virtual environment activated:
pip install mcp
Step 5: Configure Claude Desktop
- Open Claude Desktop
- Go to Claude > Settings > Developer > Edit Config
- This will open the
claude_desktop_config.jsonfile - Add the MCP server configuration:
{
"mcpServers": {
"pymol": {
"command": "[Full path to your venv python]",
"args": ["[Full path to pymol_mcp_server.py]"]
}
}
}
For example:
{
"mcpServers": {
"pymol": {
"command": "/Users/username/pymol-mcp/venv/bin/python",
"args": ["/Users/username/pymol-mcp/pymol_mcp_server.py"]
}
}
}
Note: Use the actual full paths on your system. On Windows, use forward slashes (/) instead of backslashes.
Step 6: Install the PyMOL Plugin
- Open PyMOL
- Go to Plugin → Plugin Manager
- Click on "Install New Plugin" tab
- Select "Choose file..." and navigate to the cloned repository
- Select the
pymol-mcp-socket-plugin/__init__.pyfile - Click "Open" and follow the prompts to install the plugin
Usage
Starting the Connection
-
In PyMOL:
- Go to Plugin → PyMOL MCP Socket Plugin
- Click "Start Listening"
- The status should change to "Listening on port 9876"
-
In Claude Desktop:
- You should see a hammer icon in the tools section when chatting
- Click it to access the PyMOL tools
Example Commands
Here are some examples of what you can ask Claude to do:
- "Load PDB 1UBQ and display it as cartoon"
- "Color the protein by secondary structure"
- "Highlight the active site residues with sticks representation"
- "Align two structures and show their differences"
- "Calculate the distance between these two residues"
- "Save this view as a high-resolution image"
Troubleshooting
- Connection issues: Make sure the PyMOL plugin is listening before attempting to connect from Claude
- Command errors: Check the PyMOL output window for any error messages
- Plugin not appearing: Restart PyMOL and check that the plugin was correctly installed
- Claude not connecting: Verify the paths in your Claude configuration file are correct
Limitations & Notes
- The socket connection requires both PyMOL and Claude to be running on the same machine
- Some complex operations may need to be broken down into simpler steps
- Always save your work before using experimental features
- Join our Bio-MCP Community to troubleshoot, provide feedback & improve Bio-MCPS! https://join.slack.com/t/bio-mcpslack/shared_invite/zt-31z4pho39-K5tb6sZ1hUvrFyoPmKihAA
Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
License
This project is licensed under the MIT License - see the LICENSE file for details.