mimer-mcp

Mimer MCP Server

A Model Context Protocol (MCP) server that provides Mimer SQL database connectivity to browse database schemas, execute read-only queries with parameterization support, and manage stored procedures.

Available Tools

Database Schema Tools

• list_schemas — List all available schemas in the database
• list_table_names — List table names within the specified schema
• get_table_info — Get detailed table schema and sample rows

Query Execution Tools

• execute_query — Execute SQL query with parameter support (Only SELECT queries are allowed)

Stored Procedure Tools

• list_stored_procedures — List read-only stored procedures in the database
• get_stored_procedure_definition — Get the definition of a stored procedure
• get_stored_procedure_parameters — Get the parameters of a stored procedure
• execute_stored_procedure — Execute a stored procedure in the database with JSON parameters

Getting Started

Prerequisites

• Python 3.10 or later (with uv installed) or Docker
• Mimer SQL 11.0 or later

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Environment Configuration

Before running the server, you need to configure your database connection settings using environment variables. The Mimer MCP Server reads these from a .env file.

Mimer MCP Server can be configured using environment variables through .env file with the following configuration option:

Environment Variable	Default	Description
DB_DSN	Required	Database name to connect to
DB_USER	Required	Database username
DB_PASSWORD	Required	Database password
DB_HOST	-	Database host address (use host.docker.internal for Docker)
DB_PORT	1360	Database port number
DB_PROTOCOL	tcp	Connection protocol
DB_POOL_INITIAL_CON	0	Initial number of idle connections in the pool
DB_POOL_MAX_UNUSED	0	Maximum number of unused connections in the pool
DB_POOL_MAX_CON	0	Maximum number of connections allowed (0 = unlimited)
DB_POOL_BLOCK	false	Determines behavior when exceeding the maximum number of connections. If true, block and wait for a connection to become available; if false, raise an error when maxconnections is exceeded
DB_POOL_DEEP_HEALTH_CHECK	true	If true, validates connection health before getting from pool (slower but more reliable)
MCP_LOG_LEVEL	INFO	Logging level for the MCP server. Options: DEBUG, INFO, WARNING, ERROR, CRITICAL

Usage with VS Code

MCP servers are configured using a JSON file (mcp.json). Different MCP hosts may have slightly different configuration formats. In this guide, we'll focus on VS Code as an example. First, ensure you've installed the latest version of VS Code and have access to Copilot.

One way to add MCP server in VS Code is to add the server configuration to your workspace in the .vscode/mcp.json file. This will allow you to share configuration with others.

1. Create a .vscode/mcp.json file in your workspace.
2. Add the following configuration to your .vscode/mcp.json file, depending on how you want to run the MCP server.

Option 1: Using Docker (Recommended)

Option 1.1: Build the Docker Image Locally

docker build -t mimer-mcp-server .

Then, add the following configuration to .vscode/mcp.json file

{
	"servers": {
		"mimer-mcp-server": {
			"command": "docker",
			"args": [
				"run",
				"-i",
				"--rm",
				"--add-host=host.docker.internal:host-gateway",
				"--env-file=/absolute/path/to/.env",
				"mimer-mcp-server",
			]
		}
	},
	"inputs": []
}

Option 1.2: Use the Pre-Built Image from Docker Hub

{
    "servers": {
        "mimer-mcp-server": {
            "command": "docker",
            "args": [
                "run",
                "-i",
                "--rm",
                "--add-host=host.docker.internal:host-gateway",
                "--env-file=/absolute/path/to/.env",
                "mimersql/mimer-mcp:latest"
            ]
        }
    },
    "inputs": []
}

Option 1.3: Use Docker compose and the official Mimer SQL docker container

This will start a Mimer SQL Docker container as well as the mimer-mcp-server container, set up a private network between the two containers and create the Mimer SQL example database. The Mimer SQL database will be stored in the docker volume called mimer_mcp_data so that database changes are persistent.

{
  "servers": {
    "mimer-mcp-server": {
      "command": "docker",
      "args": [
        "compose",
        "run",
        "--rm",
        "-i",
        "--no-TTY",
        "mimer-mcp-server"
      ]
    }
  },
  "inputs": []
}

Option 2.1: Using uvx

{
	"servers": {
		"mimer-mcp-server": {
			"type": "stdio",
			"command": "uvx",
			"args": [
				"mimer_mcp_server"
			],
			"env": {
				"DOTENV_PATH": "/absolute/path/to/.env"
			}
		}
	}
}

Option 2.2: Using uv

{
	"servers": {
		"mimer-mcp-server": {
			"type": "stdio",
			"command": "uv",
			"args": [
				"run",
				"--with",
				"fastmcp",
				"fastmcp",
				"run",
				"/path-to/server.py"
			],
    }
  }
}

3. After saving the configuration file, VS Code will display a Start button in the mcp.json file. Click it to launch the server.

5. Open Copilot Chat and in the Copilot Chat box, select Agent mode from the dropdown.

6. Select the Tools button to view the list of available tools. Make sure the tools from Mimer MCP Server are selected.

7. Enter a prompt in the chat input box and notice how the agent autonomously selects a suitable tool, fix errors and generate a final answer from gathered queries results. (Following examples use the Example Database from Mimer, which is owned by MIMER_STORE. Read more about this database: here)

Development

Prerequisites

• Python: 3.10+
• uv: for dependency management and running the server
• Mimer SQL 11.0 or later
• Node.js and npm: for debugging with MCP inspector

Install uv:

# macOS / Linux
curl -LsSf https://astral.sh/uv/install.sh | sh

# or via Homebrew
brew install uv

Verify installation:

uv --version

Install Node.js and npm:

# Linux (Ubuntu/Debian)
sudo apt install nodejs npm

# macOS (via Homebrew)
brew install node

Verify installation:

node --version
npm --version

Getting Started

1. Clone the repository

2. Create and activate a virtual environment

uv venv

# macOS / Linux
source .venv/bin/activate
# Windows
.venv\Scripts\activate

3. Install dependencies from pyproject.toml

uv sync

4. Configure environment variables

cp .env.example .env
# Edit .env with your database credentials

The configuration is loaded automatically via config.py.

Debug with MCP inspector

MCP Inspector provides a web interface for testing and debugging MCP Tools (Requires Node.js: 22.7.5+):

npx @modelcontextprotocol/inspector

Note: MCP Inspector is a Node.js app and the npx command allows running MCP Inspector without having to permanently install it as a Node.js package.

Alternatively, you can use FastMCP CLI to start the MCP inspector

uv run fastmcp dev inspector src/mimer_mcp_server/server.py

To run the Mimer SQL docker image and mimer-mcp-server using Docker compose, run:

MCP_TRANSPORT=http docker compose up

or to run it as a daemon:

MCP_TRANSPORT=http docker compose up -d

This way it is possible to call the mimer-mcp-server using HTTP and port 3333.