Argo CD MCP Server

An implementation of Model Context Protocol (MCP) server for Argo CD, enabling AI assistants to interact with your Argo CD applications through natural language. This server allows for seamless integration with Visual Studio Code and other MCP clients through stdio and HTTP stream transport protocols.

Features

• Transport Protocols: Supports both stdio and HTTP stream transport modes for flexible integration with different clients
• Complete Argo CD API Integration: Provides comprehensive access to Argo CD resources and operations
• AI Assistant Ready: Pre-configured tools for AI assistants to interact with Argo CD in natural language

Available Tools

The server provides the following ArgoCD management tools:

Cluster Management

• list_clusters: List all clusters registered with ArgoCD

Application Management

• list_applications: List and filter all applications
• get_application: Get detailed information about a specific application
• create_application: Create a new application
• update_application: Update an existing application
• delete_application: Delete an application
• sync_application: Trigger a sync operation on an application

Resource Management

• get_application_resource_tree: Get the resource tree for a specific application
• get_application_managed_resources: Get managed resources for a specific application
• get_application_workload_logs: Get logs for application workloads (Pods, Deployments, etc.)
• get_resource_events: Get events for resources managed by an application
• get_resource_actions: Get available actions for resources
• run_resource_action: Run an action on a resource

Installation

Prerequisites

• Node.js (v18 or higher recommended)
• pnpm package manager (for development)
• Argo CD instance with API access
• Argo CD API token (see the docs for instructions)

Usage with Cursor

1. Follow the Cursor documentation for MCP support, and create a .cursor/mcp.json file in your project:

jsonCopy code
{
  "mcpServers": {
    "argocd-mcp": {
      "command": "npx",
      "args": [
        "argocd-mcp@latest",
        "stdio"
      ],
      "env": {
        "ARGOCD_BASE_URL": "<argocd_url>",
        "ARGOCD_API_TOKEN": "<argocd_token>"
      }
    }
  }
}

2. Start a conversation with Agent mode to use the MCP.

Usage with VSCode

1. Follow the Use MCP servers in VS Code documentation, and create a .vscode/mcp.json file in your project:

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{
  "servers": {
    "argocd-mcp-stdio": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "argocd-mcp@latest",
        "stdio"
      ],
      "env": {
        "ARGOCD_BASE_URL": "<argocd_url>",
        "ARGOCD_API_TOKEN": "<argocd_token>"
      }
    }
  }
}

2. Start a conversation with an AI assistant in VS Code that supports MCP.

Usage with Claude Desktop

1. Follow the MCP in Claude Desktop documentation, and create a claude_desktop_config.json configuration file:

jsonCopy code
{
  "mcpServers": {
    "argocd-mcp": {
      "command": "npx",
      "args": [
        "argocd-mcp@latest",
        "stdio"
      ],
      "env": {
        "ARGOCD_BASE_URL": "<argocd_url>",
        "ARGOCD_API_TOKEN": "<argocd_token>"
      }
    }
  }
}

2. Configure Claude Desktop to use this configuration file in settings.

Self-signed Certificates

If your Argo CD instance uses self-signed certificates or certificates from a private Certificate Authority (CA), you may need to add the following environment variable to your configuration:

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"NODE_TLS_REJECT_UNAUTHORIZED": "0"

This disables TLS certificate validation for Node.js when connecting to Argo CD instances using self-signed certificates or certificates from private CAs that aren't trusted by your system's certificate store.

Warning: Disabling SSL verification reduces security. Use this setting only in development environments or when you understand the security implications.

Read Only Mode

If you want to run the MCP Server in a ReadOnly mode to avoid resource or application modification, you should set the environment variable:

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"MCP_READ_ONLY": "true"

This will disable the following tools:

• create_application
• update_application
• delete_application
• sync_application
• run_resource_action

By default, all the tools will be available.

Stateless Mode

By default, the HTTP transport assigns a session ID to each client connection and keeps an in-memory map of active sessions. This works well for single-instance deployments but causes 400 errors when multiple replicas are running without sticky sessions, because a request routed to a different pod will not find the session that was created on the original pod.

To run without session affinity requirements, start the server with the --stateless flag:

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node dist/index.js http --stateless

Or with Docker:

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docker run -e ARGOCD_BASE_URL=<argocd_url> -e ARGOCD_API_TOKEN=<argocd_token> \
  argoprojlabs/mcp-for-argocd http --stateless

In stateless mode:

• No Mcp-Session-Id is returned or required — any replica can handle any request
• ArgoCD credentials must be supplied on every request via environment variables or x-argocd-base-url / x-argocd-api-token headers
• GET /mcp and DELETE /mcp return 405 Method Not Allowed (session-level SSE and termination are not supported)

This mode is recommended for Kubernetes deployments with Horizontal Pod Autoscaling (HPA) where network-level sticky sessions are not available.

For Development

1. Clone the repository:

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git clone https://github.com/argoproj-labs/mcp-for-argocd.git
cd mcp-for-argocd

2. Install project dependencies:

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pnpm install

3. Start the development server with hot reloading enabled:

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pnpm run dev

Once the server is running, you can utilize the MCP server within Visual Studio Code or other MCP client.

Upgrading ArgoCD Types

To update the TypeScript type definitions based on the latest Argo CD API specification:

1. Download the swagger.json file from the ArgoCD release page, for example here is the swagger.json link for ArgoCD v2.14.11.

2. Place the downloaded swagger.json file in the root directory of the argocd-mcp project.

3. Generate the TypeScript types from the Swagger definition by running the following command. This will create or overwrite the src/types/argocd.d.ts file:

   bashCopy code
   pnpm run generate-types
   

4. Update the src/types/argocd-types.ts file to export the required types from the newly generated src/types/argocd.d.ts. This step often requires manual review to ensure only necessary types are exposed.

Credits

The project was initially created and donated by @jiachengxu, @imwithye, @hwwn, and @alexmt from Akuity.