Zig MCP server

This MCP server for Zig language provides tooling, code analysis, and documentation access to enhance AI capabilities with Zig-specific functionality. It offers tools for code optimization, resource estimation, code generation, and best practices recommendations.

Installation

1. Clone the repository

git clone [repository-url]
cd zig-mcp-server

2. Install dependencies

npm install

3. Build the server

npm run build

4. Configure environment variables

# Create a GitHub token for better API rate limits
# https://github.com/settings/tokens
# Required scope: public_repo
GITHUB_TOKEN=your_token_here

5. Add to MCP settings

{
  "mcpServers": {
    "zig": {
      "command": "node",
      "args": ["/path/to/zig-mcp-server/build/index.js"],
      "env": {
        "GITHUB_TOKEN": "your_token_here",
        "NODE_OPTIONS": "--experimental-vm-modules"
      },
      "restart": true
    }
  }
}

Usage

Code Optimization

Optimizes Zig code based on specified optimization levels:

const result = await useMcpTool("zig", "optimize_code", {
  code: `
    pub fn fibonacci(n: u64) u64 {
        if (n <= 1) return n;
        return fibonacci(n - 1) + fibonacci(n - 2);
    }
  `,
  optimizationLevel: "ReleaseFast"
});

Available optimization levels:

• Debug
• ReleaseSafe
• ReleaseFast
• ReleaseSmall

Compute Units Estimation

Analyzes Zig code to estimate computational complexity and resource usage:

const result = await useMcpTool("zig", "estimate_compute_units", {
  code: `
    pub fn bubbleSort(arr: []i32) void {
        var i: usize = 0;
        while (i < arr.len) : (i += 1) {
            var j: usize = 0;
            while (j < arr.len - 1) : (j += 1) {
                if (arr[j] > arr[j + 1]) {
                    const temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }
    }
  `
});

This tool provides:

• Memory usage analysis
• Time complexity estimation
• Allocation patterns detection

Code Generation

Generates Zig code from natural language descriptions:

const result = await useMcpTool("zig", "generate_code", {
  prompt: "Create a thread-safe counter struct",
  context: "Should use atomic operations and handle overflow"
});

The code generation supports:

• Error handling
• Testing
• Performance optimizations
• Documentation

Code Recommendations

Get improvement suggestions and best practices for your Zig code:

const result = await useMcpTool("zig", "get_recommendations", {
  code: `
    pub fn main() !void {
        var list = std.ArrayList(u8).init(allocator);
        var i: u32 = 0;
        while (true) {
            if (i >= 100) break;
            try list.append(@intCast(u8, i));
            i += 1;
        }
    }
  `,
  prompt: "performance"
});

Recommendations cover:

• Style and conventions
• Design patterns
• Safety considerations
• Performance insights

Available Resources

The server provides access to several documentation resources:

Language Reference

Access official Zig language documentation via the resource identifier zig://docs/language-reference

Standard Library Documentation

Browse the complete standard library reference with the resource identifier zig://docs/std-lib

Popular Repositories

Explore top Zig projects on GitHub with the resource identifier zig://repos/popular

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.