System Designer MCP Server

import * as path from 'path'; import * as os from 'os'; import { ensureDir, pathExists, remove, writeFile } from 'fs-extra'; export interface SystemDesignerConfig { appDataPath: string; modelsPath: string; autoRefresh: boolean; } export interface IntegrationTestResult { canAccessAppData: boolean; canWriteModels: boolean; systemDesignerInstalled: boolean; errors: string[]; } export class SystemDesignerIntegration { private readonly config: SystemDesignerConfig; constructor(config?: Partial<SystemDesignerConfig>) { this.config = this.getDefaultConfig(config); } private getDefaultConfig(overrides?: Partial<SystemDesignerConfig>): SystemDesignerConfig { const homedir = os.homedir(); const appDataPath = path.join(homedir, 'Library', 'Application Support', 'System Designer'); return { appDataPath, modelsPath: path.join(appDataPath, 'models'), autoRefresh: true, ...overrides, }; } async exportMsonModel(modelName: string, msonContent: string): Promise<void> { try { await ensureDir(this.config.modelsPath); const modelPath = path.join(this.config.modelsPath, `${modelName}.json`); await writeFile(modelPath, msonContent, 'utf8'); console.error(`MSON model exported to: ${modelPath}`); if (this.config.autoRefresh) { await this.tryRefreshApp(); } } catch (error) { throw new Error( `Failed to export MSON model: ${error instanceof Error ? error.message : 'Unknown error'}` ); } } private async tryRefreshApp(): Promise<void> { console.error('Attempting to refresh System Designer app...'); console.error( 'Auto-refresh not yet implemented - user may need to manually refresh System Designer' ); } async testIntegration(): Promise<IntegrationTestResult> { const result: IntegrationTestResult = { canAccessAppData: false, canWriteModels: false, systemDesignerInstalled: false, errors: [], }; await this.testAppDataAccess(result); await this.testModelWriting(result); await this.testAppInstallation(result); return result; } private async testAppDataAccess(result: IntegrationTestResult): Promise<void> { try { await ensureDir(this.config.appDataPath); result.canAccessAppData = true; } catch (error) { result.errors.push( `Cannot access app data directory: ${error instanceof Error ? error.message : 'Unknown error'}` ); } } private async testModelWriting(result: IntegrationTestResult): Promise<void> { try { await ensureDir(this.config.modelsPath); const testFile = path.join(this.config.modelsPath, 'test-write.json'); await writeFile(testFile, '{"test": true}', 'utf8'); await remove(testFile); result.canWriteModels = true; } catch (error) { result.errors.push( `Cannot write to models directory: ${error instanceof Error ? error.message : 'Unknown error'}` ); } } private async testAppInstallation(result: IntegrationTestResult): Promise<void> { try { const appPath = path.join('/Applications', 'System Designer.app'); const appExists = await pathExists(appPath); if (appExists) { result.systemDesignerInstalled = true; } else { result.errors.push('System Designer app not found in /Applications/'); } } catch (error) { result.errors.push( `Error checking app installation: ${error instanceof Error ? error.message : 'Unknown error'}` ); } } getConfig(): SystemDesignerConfig { return { ...this.config }; } } export const systemDesignerIntegration = new SystemDesignerIntegration();