Helm integration

[bussyjd]

This PR introduces the first stage of Helm integration into the MCP server, following the project’s architectural guidelines of using the Helm Go SDK (not the Helm CLI) for native Kubernetes and Helm operations.

Key Features:

• Adds a new pkg/helm package that abstracts Helm operations using the Helm Go SDK.
• Implements listing of Helm releases across namespaces.
• Exposes new MCP server methods for:
  • Listing all Helm releases (helmReleasesList)
  • Listing Helm releases in a specific namespace (helmListInNamespace)
• Filters out chart templates and files from the returned release data for clarity and performance.
• Updates API and internal logic to support this integration.

Motivation

• This is the foundation for Helm support in MCP, enabling multi-namespace release visibility and setting the stage for future enhancements such as repository management, install/uninstall, and chart discovery.

How to Test
npx @modelcontextprotocol/inspector@latest $(pwd)/kubernetes-mcp-server

Roadmap / Next Steps

Future PRs will add:

• Helm repo add/remove/update
• Helm install (with dry-run support)
• Helm uninstall
• Helm search hub (chart discovery)

Related Issue
Closes #55

[manusa]

Thanks for contributing, I'll review it ASAP

[manusa]

This is a good start, but it's inconsistent with the current behavior and usage of client-go.

It's a requirement that helm shares the settings used by client-go and are resolved here:

kubernetes-mcp-server/pkg/kubernetes/configuration.go

Lines 23 to 45 in fa5bb81

	func resolveKubernetesConfigurations(kubernetes *Kubernetes) error {
	// Always set clientCmdConfig
	pathOptions := clientcmd.NewDefaultPathOptions()
	if kubernetes.Kubeconfig != "" {
	pathOptions.LoadingRules.ExplicitPath = kubernetes.Kubeconfig
	}
	kubernetes.clientCmdConfig = clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
	&clientcmd.ClientConfigLoadingRules{ExplicitPath: pathOptions.GetDefaultFilename()},
	&clientcmd.ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: ""}})
	var err error
	if kubernetes.IsInCluster() {
	kubernetes.cfg, err = InClusterConfig()
	if err == nil && kubernetes.cfg != nil {
	return nil
	}
	}
	// Out of cluster
	kubernetes.cfg, err = kubernetes.clientCmdConfig.ClientConfig()
	if kubernetes.cfg != nil && kubernetes.cfg.UserAgent == "" {
	kubernetes.cfg.UserAgent = rest.DefaultKubernetesUserAgent()
	}
	return err
	}

genericclioptions.ConfigFlags internally uses a clientConfig (clientcmd.ClientConfig).

Once the cli.EnvSettings are fully resolved, the private fields should match those that we use internally in kubernetes-mcp-server.

so we probably want some sort of logic that overrides some of the settings after doing cli.New().

I did something similar here:

https://github.com/manusa/helm-java/blob/33107680bfaa1a2614f2693449ab13c6a8b54d14/native/internal/helm/helm.go#L58-L92