Docker MCP Gateway¶

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¶

Creating a DockerMCPGateway container

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¶

Since v0.39.0

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¶

WithExposedPorts Since v0.37.0
WithEnv Since v0.29.0
WithWaitStrategy Since v0.20.0
WithAdditionalWaitStrategy Since v0.38.0
WithWaitStrategyAndDeadline Since v0.20.0
WithAdditionalWaitStrategyAndDeadline Since v0.38.0
WithEntrypoint Since v0.37.0
WithEntrypointArgs Since v0.37.0
WithCmd Since v0.37.0
WithCmdArgs Since v0.37.0
WithLabels Since v0.37.0

Lifecycle Options¶

WithLifecycleHooks Since v0.38.0
WithAdditionalLifecycleHooks Since v0.38.0
WithStartupCommand Since v0.25.0
WithAfterReadyCommand Since v0.28.0

Files & Mounts Options¶

Build Options¶

WithDockerfile Since v0.37.0

Logging Options¶

Image Options¶

Networking Options¶

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¶

Since v0.39.0

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¶

Since v0.39.0

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¶

Since v0.39.0

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.

Run the MCP GatewayGet MCP Gateway's endpointConnect with an MCP clientList tools

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
}