csharp-runner

Overview

C# Runner is a high-performance platform for executing C# code online securely. It implements a Host-Worker architecture with Docker container isolation, preventing untrusted code from affecting the host system. The platform supports both HTTP REST API and MCP protocols, making it suitable for integration with various AI systems. With features like resource limits, network isolation, worker recycling, and load balancing, it provides a robust solution for running C# code safely while maintaining performance.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• run_code

  Execute C# code in a secure environment

  Try:Run this C# code: Console.WriteLine("Hello from MCP!");Try:Execute a C# program that calculates the factorial of 5Try:Run C# code to read a file and display its contents

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Installation

# Download the docker-compose.yml file
curl -L https://raw.githubusercontent.com/sdcb/csharp-runner/refs/heads/master/docker-compose.yml -o docker-compose.yml

# Start the services in detached mode
docker compose up -d

{
  "mcpServers": {
    "csharp-runner": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "sdcb/csharp-runner-host", "mcp"]
    }
  }
}

FAQ

What security measures does C# Runner implement?

C# Runner uses Docker container isolation to prevent untrusted code from affecting the host. It also supports CPU, memory, and execution timeout limits, network isolation, and worker recycling to maintain a clean environment.

Can I use C# Runner without Docker?

The project primarily provides Docker images for deployment. While you could theoretically run the host and worker services directly on your system using the .NET runtime, the containerized approach is the recommended and supported method.

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