QGIS MCP (hardened fork)

QGIS MCP connects QGIS to an LLM through the Model Context Protocol (MCP), allowing agentic interaction with and control of QGIS. This enables prompt-assisted project creation, layer loading, code execution and more.

Attribution & lineage

This is a hardened fork, distributed under GPL v3 (see LICENSE). Credit to the chain it builds on:

• BlenderMCP by Siddharth Ahuja — the original concept.

• QGIS MCP by Juan Santos Ochoa (jjsantos01) — the QGIS adaptation this is based on.

• QGIS2OllamaMCP by Anita Graser — the immediate upstream of this fork.

What this fork changes

See CHANGELOG.md for details. In short, two security hardening changes (both untested against a live QGIS — verify locally before relying on them):

1. Shared-secret token on the plugin socket (port 9876). The plugin generates a random token in ~/.qgis_mcp/token on first run; the MCP server reads the same file and must present the token, so other local processes can't drive QGIS just by reaching the socket.

2. Loopback-only MCP server. The MCP server (port 9877) now binds explicitly to 127.0.0.1, so it is never exposed to your network regardless of library defaults.

⚠️ Security note: by design this tool lets the LLM run arbitrary Python inside QGIS (the execute_code tool). Only run the plugin/server while you are actively using it, and only on a machine you trust. After starting, confirm port 9877 is on 127.0.0.1 with netstat -ano | findstr 9877.

The token check is fail-open: if the plugin cannot read or write ~/.qgis_mcp/token, it logs a warning and runs without authentication rather than refusing to start. Watch the QGIS log to confirm the token loaded.

Related MCP server: QGISMCP

Components

The system consists of two main components:

1. QGIS plugin: A QGIS plugin that creates a socket server within QGIS to receive and execute commands.

2. MCP Server: A Python server that implements the Model Context Protocol and connects to the QGIS plugin.

Installation

Prerequisites

• QGIS 3.X (tested with 3.38)

• Ollama and model with support for agents (tested with ministral-3:latest)

• For the MCP server Python environment: pip install fastmcp ollama (the upstream requests and lupa are not used by this code and are omitted)

QGIS plugin

To install the plugin, you need to copy the folder qgis_mcp_plugin and its content into your QGIS plugins folder.

Usage

Starting the connection in QGIS

1. In QGIS, go to plugins > QGIS2OllamaMCP > QGIS2OllamaMCP

2. Click "Start Server" Will launch on localhost:9876 by default.

3. Check the logs to see the connection status

Starting the MCP server

python src/qgis_mcp/qgis_mcp_server.py

Will launch on localhost:9877/sse by default (bound to 127.0.0.1).

Tools

• ping - Simple ping command to check server connectivity

• get_qgis_info - Get QGIS information about the current installation

• load_project - Load a QGIS project from the specified path

• create_new_project - Create a new project and save it

• get_project_info - Get current project information

• add_vector_layer - Add a vector layer to the project

• add_raster_layer - Add a raster layer to the project

• get_layers - Retrieve all layers in the current project

• remove_layer - Remove a layer from the project by its ID

• zoom_to_layer - Zoom to the extent of a specified layer

• get_layer_features - Retrieve features from a vector layer with an optional limit

• execute_processing - Execute a processing algorithm with the given parameters

• save_project - Save the current project to the given path

• render_map - Render the current map view to an image file

• execute_code - Execute arbitrary PyQGIS code provided as a string

Starting the conversation

You can launch an example conversation using:

python src/qgis_mcp/qgis_mcp_client.py

Note: you need to update the project file path to point to a project file on your machine.

Then launch the interactive client to start experimenting:

python src/qgis_mcp/qgis_mcp_client_interactive.py