Ocireg Mcp

Ocireg Mcp

Created by StacklokLabs2 days ago

An MCP (Model Context Protocol) server that provides tools for querying OCI registries and image references.

Data & Storage
MCPOCIimage-references

OCI Registry MCP Server

An MCP (Model Context Protocol) server that provides tools for querying OCI registries and image references.

Overview

This project implements an SSE-based MCP server that allows LLM-powered applications to interact with OCI registries. It provides tools for retrieving information about container images, listing tags, and more.

Features

  • Get information about OCI images
  • List tags for repositories
  • Get image manifests
  • Get image configs

MCP Tools

The server provides the following MCP tools:

get_image_info

Get information about an OCI image.

Input:

Output:

  • Image information including digest, size, architecture, OS, creation date, and number of layers

list_tags

List tags for a repository.

Input:

Output:

  • List of tags for the repository

get_image_manifest

Get the manifest for an OCI image.

Input:

Output:

  • The image manifest

get_image_config

Get the config for an OCI image.

Input:

Output:

  • The image config

Usage

The easiest way to run the OCI Registry MCP server is using ToolHive, which provides secure, containerized deployment of MCP servers:

## Install ToolHive (if not already installed)
## See: https://github.com/stacklok/toolhive#installation

## Enable auto-discovery to automatically configure supported clients
thv config auto-discovery true

## Run the OCI Registry MCP server (packaged as 'oci-registry' in ToolHive)
thv run oci-registry

## List running servers
thv list

## Get detailed information about the server
thv registry info oci-registry

The server will be available to your MCP-compatible clients and can query OCI registries for image information.

Authentication with ToolHive

If you need to access private registries, you can provide authentication credentials using ToolHive’s secret management:

## For bearer token authentication
thv secret set oci-token
## Enter your bearer token when prompted

thv run --secret oci-token,target=OCI_TOKEN oci-registry

## For username/password authentication
thv secret set oci-username
thv secret set oci-password
## Enter your credentials when prompted

thv run --secret oci-username,target=OCI_USERNAME --secret oci-password,target=OCI_PASSWORD oci-registry

Development

Prerequisites

  • Go 1.21 or later
  • Access to OCI registries

Authentication

The server supports the following authentication methods for accessing private OCI registries:

  1. Bearer Token: Set the following environment variable:

    • OCI_TOKEN: Bearer token for registry authentication
  2. Username and Password: Set the following environment variables:

    • OCI_USERNAME: Username for registry authentication
    • OCI_PASSWORD: Password for registry authentication
  3. Docker Config: If no token or username/password is provided, the server will use the default Docker keychain, which reads credentials from ~/.docker/config.json.

Examples:

## Bearer token authentication
export OCI_TOKEN=mytoken

## Username/password authentication
export OCI_USERNAME=myuser
export OCI_PASSWORD=mypassword

Port Configuration

The server can be configured to listen on a specific port using either:

  1. Environment Variable:

    • MCP_PORT: The port number to listen on (must be between 0 and 65535)
    • If not set or invalid, defaults to port 8080
  2. Command-line Flag:

    • -port: Overrides the environment variable setting (must be between 0 and 65535)
    • If invalid port provided it defaults to port 8080
    • Example: ./ocireg-mcp -port 9090

Testing

go test ./...

Linting

golangci-lint run

## Contributing

We welcome contributions to this MCP server! If you'd like to contribute, please review
the [CONTRIBUTING guide](https://github.com/StacklokLabs/ocireg-mcp/blob/main/CONTRIBUTING.md) for details on how to get started.

If you run into a bug or have a feature request, please
[open an issue](https://github.com/StacklokLabs/ocireg-mcp/issues) in the
repository or join us in the `#mcp-servers` channel on our
[community Discord server](https://discord.gg/stacklok).

## License

This project is licensed under the Apache v2 License - see the LICENSE file for details.

Prerequisites

  • Familiarity with the server domain
  • Basic understanding of related technologies
  • Knowledge of Data & Storage

Recommended Server

Details

Created

June 11, 2025

Last Updated

June 11, 2025

Author

StacklokLabs

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