StatelyDB MCP Server

A Model Context Protocol (MCP) server that integrates with the StatelyDB CLI to enable AI assistants to validate and manage StatelyDB schemas.

Prerequisites

• Node.js: Version 16.0.0 or higher
• Stately CLI: Make sure the stately command is available in your PATH:

curl -sL https://stately.cloud/install | sh

Installation

From npm registry

Install the server globally:

npm install -g @stately-cloud/statelydb-mcp-server

Alternatively, you can run it directly with npx:

npx @stately-cloud/statelydb-mcp-server

From local source

To install directly from your local source code:

1. Clone or download this repository
2. Navigate to the project directory
3. Install dependencies and link the package locally:

# Install dependencies
npm install

# Build the TypeScript code
npm run build

# Create a global symlink to your local code
npm link

This will create a global statelydb-mcp-server command that uses your local code.

To unlink later, you can run:

npm unlink statelydb-mcp-server

Configuring with Claude Desktop

To use this MCP server with Claude Desktop, follow these steps:

1. Open your Claude Desktop App configuration file:

   • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
   • Windows: %APPDATA%\Claude\claude_desktop_config.json

2. Add the server configuration to the mcpServers section:

{
  "mcpServers": {
    "statelydb": {
      "command": "npx",
      "args": ["-y", "@stately-cloud/statelydb-mcp-server"]
    }
  }
}

3. Save the file and restart Claude Desktop.

Available Tools

This MCP server exposes the following tools:

1. validate-schema

Validates a StatelyDB elastic schema definition.

Input:

• schema: String containing the schema definition

Output:

• Success: "Schema is valid."
• Failure: "Schema is invalid. Error: [error message]"

Example:

Could you validate this StatelyDB schema?

import {
  itemType,
  string,
  timestampSeconds,
  uint,
  uuid,
} from "@stately-cloud/schema";

/** A user of our fantastic new system. */
itemType("User", {
  keyPath: "/user-:id",
  fields: {
    id: {
      type: uuid,
      initialValue: "uuid",
    },
    displayName: {
      type: string,
    },
    email: {
      type: string,
    },
    lastLoginDate: {
      type: timestampSeconds,
    },
    numLogins: {
      type: uint,
    },
  },
});

2. validate-migrations

Validates that schema migrations are valid. This is the same as running stately schema put in dry-run mode.

Input:

• schema: String containing the schema definition
• schemaId: Your StatelyDB schema ID

Output:

• Success: "Migrations are valid."
• Failure: "Migrations are invalid. Error: [error message]"

Example:

Could you check if this StatelyDB schema has valid migrations?

import {
  itemType,
  string,
  timestampSeconds,
  uint,
  uuid,
} from "@stately-cloud/schema";

itemType("User", {
  keyPath: "/user-:id",
  fields: {
    id: {
      type: uuid,
      initialValue: "uuid",
    },
    displayName: {
      type: string,
    },
    email: {
      type: string,
    },
    lastLoginDate: {
      type: timestampSeconds,
    },
    loginCount: {
      type: uint,
    },
  },
});

migrate(1, "Rename the numLogins field", (m) => {
  m.changeType("User", (t) => {
    t.renameField("numLogins", "loginCount");
  });
});

3. attempt-login

Initiates the Stately login process, providing a URL for authentication.

Input:

• None

Output:

• URL for authentication: "Please visit this URL to complete the authentication process: [url]"

Example:

Could you help me log into StatelyDB?

4. verify-login

Verifies if the user is currently logged in to StatelyDB.

Input:

• None

Output:

• Success: "Login verified. [user information]"
• Failure: "Not logged in."

Example:

Am I currently logged into StatelyDB?

5. schema-put

Publishes a schema to StatelyDB.

Input:

• schema: String containing the schema definition
• schemaId: Your StatelyDB schema ID

Output:

• Success: "Schema published successfully: [output]"
• Failure: "Failed to publish schema: [error message]"

Example:

Publish this StatelyDB schema:

import {
  itemType,
  string,
  timestampSeconds,
  uint,
  uuid,
} from "@stately-cloud/schema";

/** A user of our fantastic new system. */
itemType("User", {
  keyPath: "/user-:id",
  fields: {
    id: {
      type: uuid,
      initialValue: "uuid",
    },
    displayName: {
      type: string,
    },
    email: {
      type: string,
    },
    lastLoginDate: {
      type: timestampSeconds,
    },
    numLogins: {
      type: uint,
    },
  },
});

6. schema-generate

Generates client code for a specified language from a StatelyDB schema.

Input:

• schemaId: Your StatelyDB schema ID
• language: One of "typescript", "python", "ruby", "go"

Output:

• List of generated files with their contents

Example:

Could you generate TypeScript client code for schema id 1234?

Security Considerations

• This MCP server runs local commands on your machine. Always review schemas before publishing them.
• The server requires access to the Stately CLI and your Stately authentication credentials.
• No data is sent to external services except through the official Stately CLI.

License

Apache 2.0