NATS MCP Server

@bmorphism

About NATS MCP Server

MCP server for NATS messaging system using NATS CLI - enabling AI agents to interact with NATS messaging

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "nats": {
      "command": "node",
      "args": [
        "/path/to/nats-mcp-server/build/index.js"
      ],
      "env": {
        "NATS_URL": "nats://localhost:4222"
      }
    }
  }
}

Tools

No tools detected

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is NATS MCP Server?

NATS MCP Server is a Model Context Protocol server that provides access to NATS, a cloud-native messaging system, through the NATS CLI. It enables AI models to publish, subscribe to, and request-reply over NATS subjects.

How to use NATS MCP Server?

Install via npm (npm install @modelcontextprotocol/nats-mcp-server) or build from source. Configure with the NATS_URL environment variable (default nats://localhost:4222). Add the server to your MCP client’s configuration (e.g., Cline or Claude Desktop) and then invoke its tools: publish, subscribe, or request.

Key features of NATS MCP Server

Publish messages with headers, templates, and reply subjects
Subscribe to subjects with configurable timeouts and message counts
Request-reply pattern support with optional headers
Go template functions for dynamic message content
Full NATS CLI integration and robust error handling

Use cases of NATS MCP Server

AI assistants sending commands or events via NATS subjects
Implementing request-reply service calls (e.g., asking a service for the time)
Broadcasting messages to multiple subscribers with templates or headers
Testing and debugging NATS messaging patterns from an MCP client

FAQ from NATS MCP Server

What are the required dependencies?

Node.js >= 14.0.0 and the NATS CLI (nats) installed on the system.

How do I install the NATS CLI?

Installation varies by OS: Homebrew on macOS (brew install nats), snap install nats on Linux, Chocolatey or Scoop on Windows, or build from source with Go.

How do I configure the NATS server URL?

Set the NATS_URL environment variable before starting the MCP server. Default is nats://localhost:4222.

What MCP tools does the server offer?

Three tools: publish (send messages with optional headers, templates, and reply subjects), subscribe (receive messages with timeout and count limits), and request (send a request and wait for a reply with optional headers).

Can I use templates in messages?

Yes. When template: true is set on publish, the message can use functions like {{Count}}, {{Time}}, {{Random min max}}, and others.

Frequently asked questions

What are the required dependencies?

Node.js >= 14.0.0 and the NATS CLI (`nats`) installed on the system.

How do I install the NATS CLI?

Installation varies by OS: Homebrew on macOS (`brew install nats`), `snap install nats` on Linux, Chocolatey or Scoop on Windows, or build from source with Go.

How do I configure the NATS server URL?

Set the `NATS_URL` environment variable before starting the MCP server. Default is `nats://localhost:4222`.

What MCP tools does the server offer?

Three tools: `publish` (send messages with optional headers, templates, and reply subjects), `subscribe` (receive messages with timeout and count limits), and `request` (send a request and wait for a reply with optional headers).

Can I use templates in messages?

Yes. When `template: true` is set on `publish`, the message can use functions like `{{Count}}`, `{{Time}}`, `{{Random min max}}`, and others.

Comments

Basic information

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