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Why EventCatalog MCP Server?

EventCatalog is an Open Source tool that helps you document your event-driven architecture. Using EventCatalog you can document your domains, services and messages, schemas and much more.

Using the EventCatalog MCP Server you can get more value from your EventCatalog by asking questions about your architecture in the tools you already use.

Example questions:

• What events do we have in our architecture?
• Tell me more about the {service} service.
• I want to create a new feature that will send emails when a user signs up, what events do we have in our architecture that are related to user signups?
• Get me the schema for the event UserCreated in EventCatalog.
• Here is a new version of the UserCreated schema, what downstream consumers will be affected by this change?

Rather then digging through your architecture to find the answers you need, you can ask the MCP server directly from your MCP Client.

EventCatalog MCP Features

• 🤖 Connect to any MCP Client (Claude, Cursor, Windsurf, etc)
• 🤖 Run MCP server locally on your machine with one command
• 🤖 Connect to your EventCatalog instances
• 🤖 Ask questions about your architectures
• 🤖 Ask questions about your OpenAPI and AsyncAPI specifications
• 🤖 Ask about domains, services and messages, and much more
• 🤖 Get the schemas for events, queries, commands and services (OpenAPI, AsyncAPI, JSON Schema)
• 🤖 Ask questions about ubiquitous language for any domain and their entities

Getting Started

Installation

First, you need to enable the LLMS.txt feature in your EventCatalog instance.

1. Enable the LLMS.txt feature in your EventCatalog instance, by configuring your eventcatalog.config.js file.
2. Deploy your EventCatalog instance with the LLMS.txt feature enabled.

Next, you will need to get a EventCatalog Scale license key, you can get a 14 day trial license key from EventCatalog Cloud.

Installing via Smithery

To install EventCatalog for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @event-catalog/mcp-server --client claude

Setup MCP Clients

Each MCP client has a different way of adding the MCP server.

You can find some helpful links below to get started.

• Claude Desktop
• Cursor

Adding the MCP server to Claude Desktop

To use this with Claude Desktop, add the following to your claud_desktop_config.json file. The full path on MacOS: ~/Library/Application Support/Claude/claud_desktop_config.json, on Windows: %APPDATA%\Claude\claud_desktop_config.json

{
  "mcpServers": {
    "eventcatalog": {
      "command": "npx",
      "args": [
        "-y",
        "@eventcatalog/mcp-server",
        "https://demo.eventcatalog.dev", // Replace with your EventCatalog URL
        "ABCD-1234-5678-9012-3456-7890" // Replace with your EventCatalog Scale license key
      ]
    }
  }
}

Adding the MCP server to Cursor

Go to Cursor Settings -> MCP Servers -> Add MCP Server.

• Name: eventcatalog
• Command: npx
• Args: -y @eventcatalog/mcp-server {URL_TO_YOUR_EVENTCATALOG_INSTANCE}

Configuration for your project

You can also create .mcp.json files in your project to configure the MCP server for your project using Cursor.

{
  "mcpServers": {
    "eventcatalog": {
      "command": "npx",
      "args": ["-y", "@eventcatalog/mcp-server", "https://demo.eventcatalog.dev", "ABCD-1234-5678-9012-3456-7890"]
    }
  }
}

You can read more about configuration for your project in the Cursor documentation.

API

Here is a list of all the APIs that the MCP server supports.

Tools

• find_resources
  • Find resources that are available in EventCatalog
• find_resource
  • Get more information about a service, domain, event, command, query or flow in EventCatalog using its id and version
• find_producers_and_consumers
  • Get the producers (sends) and consumers (receives) for a service in EventCatalog
• get_schema
  • Returns the schema for a service, event, command or query in EventCatalog
• review_schema_changes
  • Reviews schema changes for breaking changes and suggests fixes.
• explain_ubiquitous_language_terms
  • Explain ubiquitous language terms for a given domain
• find_owners
  • Find owners (teams or users) for a domain, services, messages, events, commands, queries, flows or entities in EventCatalog
• create_flow
  • Create a new flow in EventCatalog given a description of the business workflow.
  • The tool will check all your resources in EventCatalog to find the best resources to match against the description.
  • The flow will be created (markdown file) and can be visualized in EventCatalog.

Resources

• eventcatalog://all
  • All messages, domains and services in EventCatalog
• eventcatalog://events
  • All events in EventCatalog
• eventcatalog://domains
  • All domains in EventCatalog
• eventcatalog://services
  • All services in EventCatalog
• eventcatalog://queries
  • All queries in EventCatalog
• eventcatalog://commands
  • All commands in EventCatalog
• eventcatalog://flows
  • All flows in EventCatalog
• eventcatalog://teams
  • All teams in EventCatalog
• eventcatalog://users
  • All users in EventCatalog

Missing an API?

We are working on adding more APIs to the MCP server. If you need something specific, please open an issue and we will add it to the server.

Contributing

1. Clone the repository
2. Run pnpm install to install the dependencies
3. Run pnpm run build

To use the build as your MCP server you can point your MCP client to the dist folder.

Example for Cursor:

{
  "mcpServers": {
    "eventcatalog": {
      "command": "npx",
      "args": ["-y", "tsx /PATH_TO_YOUR_REPO/src/index.ts",  "https://demo.eventcatalog.dev", "ABCD-1234-5678-9012-3456-7890"]
    }
  }
}

License

Usage of this feature is part of the EventCatalog Scale Plan