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Docker MCP Gateway

Not available until the next release main

Introduction

The Testcontainers module for the Docker MCP Gateway.

Adding this module to your project dependencies

Please run the following command to add the Docker MCP Gateway module to your Go dependencies:

go get github.com/testcontainers/testcontainers-go/modules/dockermcpgateway

Usage example

ctx := context.Background()

ctr, err := dmcpg.Run(
    ctx, "docker/mcp-gateway:latest",
    dmcpg.WithTools("curl", []string{"curl"}),
    dmcpg.WithTools("duckduckgo", []string{"fetch_content", "search"}),
    dmcpg.WithTools("github-official", []string{"add_issue_comment"}),
)
defer func() {
    if err := testcontainers.TerminateContainer(ctr); err != nil {
        log.Printf("failed to terminate container: %s", err)
    }
}()
if err != nil {
    log.Printf("failed to start container: %s", err)
    return
}

Module Reference

Run function

  • Not available until the next release main

The DockerMCPGateway module exposes one entrypoint function to create the DockerMCPGateway container, and this function receives three parameters:

func Run(ctx context.Context, img string, opts ...testcontainers.ContainerCustomizer) (*Container, error)
  • context.Context, the Go context.
  • string, the Docker image to use.
  • testcontainers.ContainerCustomizer, a variadic argument for passing options.

Image

Use the second argument in the Run function to set a valid Docker image. In example: Run(context.Background(), "docker/mcp-gateway:latest").

Container Options

When starting the DockerMCPGateway container, you can pass options in a variadic way to configure it.

The following options are exposed by the testcontainers package.

Basic Options

Lifecycle Options

Files & Mounts Options

Build Options

Logging Options

Image Options

Networking Options

Advanced Options

Experimental Options

WithTools

  • Not available until the next release main

Use the WithTools option to set the tools from a server to be available in the MCP Gateway container. Adding multiple tools for the same server will append to the existing tools for that server, and no duplicate tools will be added for the same server.

dockermcpgateway.WithTools("brave", []string{"brave_local_search", "brave_web_search"})

WithSecrets

  • Not available until the next release main

Use the WithSecrets option to set the tools from a server to be available in the MCP Gateway container. Empty keys are not allowed, although empty values are allowed for a key.

dockermcpgateway.WithSecret("github_token", "test_value")
dockermcpgateway.WithSecrets(map[string]{
    "github_token": "test_value",
    "foo":          "bar",
})

Container Methods

The DockerMCPGateway container exposes the following methods:

Tools

  • Not available until the next release main

Returns a map of tools available in the MCP Gateway container, where the key is the server name and the value is a slice of tool names.

tools := ctr.Tools()

GatewayEndpoint

  • Not available until the next release main

Returns the endpoint of the MCP Gateway container, which is a string containing the host and mapped port for the default MCP Gateway port (8811/tcp).

endpoint := ctr.GatewayEndpoint()

Examples

Connecting to the MCP Gateway using an MCP client

This example shows the usage of the MCP Gateway module to connect with an MCP client.

ctx := context.Background()

ctr, err := dmcpg.Run(
    ctx, "docker/mcp-gateway:latest",
    dmcpg.WithTools("curl", []string{"curl"}),
    dmcpg.WithTools("duckduckgo", []string{"fetch_content", "search"}),
    dmcpg.WithTools("github-official", []string{"add_issue_comment"}),
)
defer func() {
    if err := testcontainers.TerminateContainer(ctr); err != nil {
        log.Printf("failed to terminate container: %s", err)
    }
}()
if err != nil {
    log.Printf("failed to start container: %s", err)
    return
}

gatewayEndpoint, err := ctr.GatewayEndpoint(ctx)
if err != nil {
    log.Printf("failed to get gateway endpoint: %s", err)
    return
}

transport := mcp.NewSSEClientTransport(gatewayEndpoint, nil)

client := mcp.NewClient(&mcp.Implementation{Name: "mcp-client", Version: "v1.0.0"}, nil)

cs, err := client.Connect(context.Background(), transport)
if err != nil {
    log.Printf("Failed to connect to MCP gateway: %v", err)
    return
}

mcpTools, err := cs.ListTools(context.Background(), &mcp.ListToolsParams{})
if err != nil {
    log.Printf("Failed to list tools: %v", err)
    return
}