Add support for Model Context Protocol

- Add new package to start a MCP server as part of the GLSP server
-- Start MCP HTTP server for client connections on GLSP server start
-- Provide some default tools and resources
-- Expose functionality as custom module
- Extend examples to use GLSP MCP Server

Part of eclipse-glsp/glsp#1546

Author: martin-fleck-at

examples/workflow-server/package.json

@@ -58,6 +58,7 @@
   "dependencies": {
     "@eclipse-glsp/layout-elk": "2.6.0-next",
     "@eclipse-glsp/server": "2.6.0-next",
+    "@eclipse-glsp/server-mcp": "2.6.0-next",
     "inversify": "^6.1.3"
   },
   "devDependencies": {

examples/workflow-server/src/common/workflow-diagram-module.ts

@@ -21,7 +21,7 @@ import {
     ContextMenuItemProvider,
     DiagramConfiguration,
     EdgeCreationChecker,
-    GLSPServer,
+    GLSPServerInitContribution,
     GModelDiagramModule,
     InstanceMultiBinding,
     LabelEditValidator,
@@ -57,13 +57,13 @@ import { TaskEditContextActionProvider } from './taskedit/task-edit-context-prov
 import { TaskEditValidator } from './taskedit/task-edit-validator';
 import { WorkflowDiagramConfiguration } from './workflow-diagram-configuration';
 import { WorkflowEdgeCreationChecker } from './workflow-edge-creation-checker';
-import { WorkflowGLSPServer } from './workflow-glsp-server';
+import { CustomArgsInitContribution } from './workflow-glsp-server';
 import { WorkflowPopupFactory } from './workflow-popup-factory';
 
 @injectable()
 export class WorkflowServerModule extends ServerModule {
-    protected override bindGLSPServer(): BindingTarget<GLSPServer> {
-        return WorkflowGLSPServer;
+    protected override configureGLSPServerInitContributions(binding: MultiBinding<GLSPServerInitContribution>): void {
+        binding.add(CustomArgsInitContribution);
     }
 }
 

examples/workflow-server/src/common/workflow-glsp-server.ts

@@ -13,25 +13,32 @@
  *
  * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
  ********************************************************************************/
-import { Args, ArgsUtil, DefaultGLSPServer, InitializeResult, Logger, MaybePromise } from '@eclipse-glsp/server';
+import {
+    ArgsUtil,
+    GLSPServer,
+    GLSPServerInitContribution,
+    InitializeParameters,
+    InitializeResult,
+    Logger,
+    MaybePromise
+} from '@eclipse-glsp/server';
 import { inject, injectable } from 'inversify';
 
 @injectable()
-export class WorkflowGLSPServer extends DefaultGLSPServer {
+export class CustomArgsInitContribution implements GLSPServerInitContribution {
     MESSAGE_KEY = 'message';
     TIMESTAMP_KEY = 'timestamp';
 
-    @inject(Logger)
-    protected override logger: Logger;
+    @inject(Logger) protected logger: Logger;
 
-    protected override handleInitializeArgs(result: InitializeResult, args: Args | undefined): MaybePromise<InitializeResult> {
-        if (!args) {
+    initializeServer(server: GLSPServer, params: InitializeParameters, result: InitializeResult): MaybePromise<InitializeResult> {
+        if (!params.args) {
             return result;
         }
-        const timestamp = ArgsUtil.get(args, this.TIMESTAMP_KEY);
-        const message = ArgsUtil.get(args, this.MESSAGE_KEY);
+        const timestamp = ArgsUtil.get(params.args, this.TIMESTAMP_KEY);
+        const message = ArgsUtil.get(params.args, this.MESSAGE_KEY);
 
-        this.logger.debug(`${timestamp}: ${message}`);
+        this.logger.info(`${timestamp}: ${message}`);
         return result;
     }
 }

examples/workflow-server/src/node/app.ts

@@ -16,9 +16,10 @@
 import 'reflect-metadata';
 
 import { configureELKLayoutModule } from '@eclipse-glsp/layout-elk';
-import { createAppModule, GModelStorage, Logger, SocketServerLauncher, WebSocketServerLauncher } from '@eclipse-glsp/server/node';
+import { GModelStorage, Logger, SocketServerLauncher, WebSocketServerLauncher, createAppModule } from '@eclipse-glsp/server/node';
 import { Container } from 'inversify';
 
+import { configureMcpModule } from '@eclipse-glsp/server-mcp';
 import { WorkflowLayoutConfigurator } from '../common/layout/workflow-layout-configurator';
 import { WorkflowDiagramModule, WorkflowServerModule } from '../common/workflow-diagram-module';
 import { createWorkflowCliParser } from './workflow-cli-parser';
@@ -40,14 +41,14 @@ async function launch(argv?: string[]): Promise<void> {
 
     const elkLayoutModule = configureELKLayoutModule({ algorithms: ['layered'], layoutConfigurator: WorkflowLayoutConfigurator });
     const serverModule = new WorkflowServerModule().configureDiagramModule(new WorkflowDiagramModule(() => GModelStorage), elkLayoutModule);
-
+    const mcpModule = configureMcpModule();
     if (options.webSocket) {
         const launcher = appContainer.resolve(WebSocketServerLauncher);
-        launcher.configure(serverModule);
+        launcher.configure(serverModule, mcpModule);
         await launcher.start({ port: options.port, host: options.host, path: 'workflow' });
     } else {
         const launcher = appContainer.resolve(SocketServerLauncher);
-        launcher.configure(serverModule);
+        launcher.configure(serverModule, mcpModule);
         await launcher.start({ port: options.port, host: options.host });
     }
 }

examples/workflow-server/tsconfig.json

@@ -12,6 +12,9 @@
     {
       "path": "../../packages/server"
     },
+    {
+      "path": "../../packages/server-mcp"
+    },
     {
       "path": "../../packages/layout-elk"
     }

packages/server-mcp/.eslintrc.js

@@ -0,0 +1,12 @@
+/** @type {import('eslint').Linter.Config} */
+module.exports = {
+    extends: '../../.eslintrc.js',
+    rules: {
+        'import/no-unresolved': [
+            'error',
+            {
+                ignore: ['^@modelcontextprotocol/sdk/']
+            }
+        ]
+    }
+};

packages/server-mcp/package.json

@@ -0,0 +1,62 @@
+{
+  "name": "@eclipse-glsp/server-mcp",
+  "version": "2.6.0-next",
+  "description": "Extension of the GLSP Node Server for the Model Context Protocol",
+  "keywords": [
+    "eclipse",
+    "graphics",
+    "diagram",
+    "modeling",
+    "visualization",
+    "glsp",
+    "diagram editor",
+    "mcp"
+  ],
+  "homepage": "https://www.eclipse.org/glsp/",
+  "bugs": "https://github.com/eclipse-glsp/glsp/issues",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/eclipse-glsp/glsp-server-node.git"
+  },
+  "license": "(EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0)",
+  "author": {
+    "name": "Eclipse GLSP"
+  },
+  "contributors": [
+    {
+      "name": "Eclipse GLSP Project",
+      "email": "glsp-dev@eclipse.org",
+      "url": "https://projects.eclipse.org/projects/ecd.glsp"
+    }
+  ],
+  "main": "lib/index",
+  "types": "lib/index",
+  "files": [
+    "lib",
+    "src"
+  ],
+  "scripts": {
+    "build": "tsc -b",
+    "clean": "rimraf lib *.tsbuildinfo coverage .nyc_output",
+    "generate:index": "glsp generateIndex src -f -s",
+    "lint": "eslint --ext .ts,.tsx ./src",
+    "test": "mocha --config ../../.mocharc \"./src/**/*.spec.?(ts|tsx)\"",
+    "test:ci": "yarn test --reporter mocha-ctrf-json-reporter",
+    "test:coverage": "nyc yarn test",
+    "watch": "tsc -w"
+  },
+  "dependencies": {
+    "@eclipse-glsp/server": "2.6.0-next",
+    "@modelcontextprotocol/sdk": "^1.25.1",
+    "express": "^5.2.1"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.6"
+  },
+  "peerDependencies": {
+    "inversify": "^6.1.3"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}