Pinner MCP server

This MCP server helps pin third-party dependencies like Docker base images and GitHub Actions to immutable digests, enhancing security by ensuring you're using specific, verified versions rather than potentially vulnerable floating tags.

Installation

You can run the Pinner MCP server as a container with stdio transport:

docker run -it --rm ghcr.io/safedep/pinner-mcp:latest

Configuration

Setting Up in Cursor

To use Pinner MCP with Cursor, add the following to your .cursor/mcp.json file:

{
  "mcpServers": {
    "pinner-mcp-stdio-server": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "ghcr.io/safedep/pinner-mcp:latest"
      ]
    }
  }
}

Note: You must enable the MCP server in Cursor settings. See the Cursor documentation for more details.

Usage Examples

Pinning Dependencies

You can use simple prompts in Cursor to pin dependencies:

For GitHub Actions

Pin GitHub Actions to their commit hash

For Docker Base Images

Pin container base images to digests

Updating Pinned Versions

To update dependencies that have already been pinned:

Update pinned versions of container base images

Keeping the Tool Updated

The MCP server is regularly updated. To get the latest version:

docker pull ghcr.io/safedep/pinner-mcp:latest

This ensures you have the most recent features and security updates available for the tool.

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.