Talos opinionated MCP Server

NOTE: This project is under active development.

Motivation

Modern infrastructure often uses tools such as Terraform/OpenTofu, Ansible, and GitOps. These tools deploy and configure Talos Linux nodes and Kubernetes clusters.

The Talos MCP Server does not replace these tools. It gives AI assistants and automation agents access to information about your Talos clusters.

The default tools are read-only. An optional action tool can be enabled with --allow-destructive to reboot a node.

Instead of running many talosctl commands across nodes, you can ask an AI assistant to collect and analyze the required information. Your existing automation tools remain the main source for infrastructure changes.

Related MCP server: rancher-mcp-server

Overview

The server connects an MCP client, such as an AI assistant, to the Talos API (apid) and, optionally, to the Talos discovery service. It supports multiple Talos clusters and returns structured data.

You can use it to:

• inspect clusters, nodes, and their Talos and Kubernetes versions

• read Talos service logs and kernel logs (dmesg) of a node

• review recent Talos runtime events

• list cluster members from the discovery service, even when the Talos API is down

• collect information before you make infrastructure changes

Keep your AI on the leash.

Talos tools

The MCP server provides the following tools:

cluster is a talosconfig context name. When it is omitted, the current context is used. Use talos_clusters_list first to find the cluster names. MCP clients can discover the full input and output schemas. You can also list the tools from the command line:

talos-mcp tools --talosconfig /absolute/path/to/talosconfig

When --allow-destructive is enabled and the cluster's credential has the os:operator role, talos_node_reboot accepts cluster, node, and an optional mode (default or powercycle). It returns once Talos accepts the request; it does not wait for the node to come back.

The tools available on each cluster depend on the role of its client certificate: os:reader gets the read-only tools, os:operator also gets the reboot tool.

Installation

For a local installation with Homebrew, run:

brew install sergelogvinov/tap/talos-mcp

You do not need a local installation when you use an MCP server hosted on another machine.

Configure Talos clusters

The server reads a standard talosconfig, the same file talosctl uses. Each context is one cluster. Create a dedicated credential with the smallest role you need:

talosctl config new --roles os:reader --crt-ttl 8760h ~/.talos/mcp-config

A context may also have an optional discovery block with the cluster ID and secret, which enables talos_clusters_members:

context: prod-eu
contexts:
  prod-eu:
    endpoints: [10.0.0.10, 10.0.0.11, 10.0.0.12]
    ca: LS0t...
    crt: LS0t...
    key: LS0t...
    discovery:
      cluster_id: 3x9y...
      cluster_secret: c2VjcmV0...

The private key and cluster_secret can be stored encrypted with a passphrase, an age key, or your SSH key:

talos-mcp config encrypt --talosconfig ~/.talos/mcp-config -o ~/.talos/mcp-config.enc \
    --recipient-file ~/.ssh/id_ed25519.pub
talos-mcp config check --talosconfig ~/.talos/mcp-config.enc \
    --talosconfig-identity ~/.ssh/id_ed25519

Set the talosconfig path with --talosconfig or TALOSCONFIG. The default is ~/.talos/config.

See docs/config.md for every talosconfig field, the discovery block, credential roles, the unlock options for encrypted secrets, the config import, encrypt, decrypt, and check commands, deployment recipes, and troubleshooting.

Configure an MCP client

Local stdio server

For clients that use a JSON MCP configuration, add an entry like this:

{
  "mcpServers": {
    "talos": {
      "command": "talos-mcp",
      "args": ["mcp"],
      "env": {
        "TALOSCONFIG": "/absolute/path/to/talosconfig"
      }
    }
  }
}

If the talosconfig has encrypted fields, also set an unlock source, for example "TALOSCONFIG_IDENTITY": "/absolute/path/to/.ssh/id_ed25519". The mcp command never prompts for a passphrase.

Remote HTTP server

Start the streamable HTTP server with:

talos-mcp server \
  --talosconfig /absolute/path/to/talosconfig \
  --listen-address :8080

The MCP endpoint is http://host:8080/mcp, and a health check is served on /healthz.

For a remote client, use an HTTPS URL that ends with /mcp:

{
  "mcpServers": {
    "talos": {
      "type": "http",
      "url": "https://talos-mcp.example.com/mcp"
    }
  }
}

The server does not provide user authentication for the HTTP endpoint. Every caller uses the credentials from the server's talosconfig, so protect the endpoint with a network policy or an authenticating proxy.

A Helm chart for Kubernetes is available in charts/talos-mcp.

Restart or reload the MCP client after you save its configuration.

Running

Common flags

The mcp, server, and tools commands use the following flags. Each flag can also be set with an environment variable. A command-line flag has higher priority than an environment variable.

The server command also accepts --listen-address (LISTEN_ADDRESS, default 127.0.0.1:8080) and --require-all-contexts (REQUIRE_ALL_CONTEXTS). The container image sets LISTEN_ADDRESS=:8080. The tools command accepts --output (-o) with text, json, or yaml. Its default is text.

For example, run the stdio server with JSON logs:

talos-mcp mcp \
  --talosconfig /absolute/path/to/talosconfig \
  --log-format json

Test the configuration

Check the talosconfig and its encrypted fields:

talos-mcp config check --talosconfig /absolute/path/to/talosconfig

List all available tools:

export TALOSCONFIG="/absolute/path/to/talosconfig"
talos-mcp tools

Call a tool directly:

talos-mcp tools talos_clusters_list
talos-mcp tools talos_clusters_describe cluster=prod-eu
talos-mcp tools -o json talos_node_logs cluster=prod-eu node=10.0.0.10 service=kubelet tail=50

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Talos Linux is a trademark of Sidero Labs, Inc.