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claude[bot]cameroncooke
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cameroncooke
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feat: implement MCP resource for list_sims
- Add resources capability to MCP server configuration - Create resource management system at src/core/resources.ts - Implement mcp://xcodebuild/simulators resource URI - Add comprehensive tests following no-vitest-mocking guidelines - Maintain backward compatibility with existing list_sims tools - Register resources in both static and dynamic modes Co-authored-by: Cameron Cooke <cameroncooke@users.noreply.github.com>
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‎src/core/__tests__/resources.test.ts‎

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import { describe, it, expect, beforeEach, vi } from 'vitest';
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import { EventEmitter } from 'events';
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import { spawn } from 'child_process';
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import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
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// CRITICAL: Mock BEFORE imports to ensure proper mock chain
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vi.mock('child_process', () => ({
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spawn: vi.fn(),
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}));
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import {
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registerResources,
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getAvailableResources,
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supportsResources,
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RESOURCE_URIS,
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} from '../resources.js';
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import { createMockExecutor } from '../../utils/test-common.js';
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class MockChildProcess extends EventEmitter {
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stdout = new EventEmitter();
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stderr = new EventEmitter();
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pid = 12345;
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}
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describe('resources', () => {
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let mockProcess: MockChildProcess;
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let mockServer: McpServer;
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beforeEach(() => {
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vi.clearAllMocks();
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mockProcess = new MockChildProcess();
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vi.mocked(spawn).mockReturnValue(mockProcess as any);
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// Create a mock MCP server
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mockServer = {
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resource: vi.fn(),
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} as unknown as McpServer;
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});
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describe('Constants and Exports', () => {
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it('should export correct RESOURCE_URIS', () => {
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expect(RESOURCE_URIS.SIMULATORS).toBe('mcp://xcodebuild/simulators');
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});
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it('should export supportsResources function', () => {
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expect(typeof supportsResources).toBe('function');
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});
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it('should export registerResources function', () => {
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expect(typeof registerResources).toBe('function');
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});
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it('should export getAvailableResources function', () => {
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expect(typeof getAvailableResources).toBe('function');
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});
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});
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describe('supportsResources', () => {
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it('should return true for resource support', () => {
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expect(supportsResources()).toBe(true);
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});
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});
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describe('getAvailableResources', () => {
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it('should return array of available resource URIs', () => {
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const resources = getAvailableResources();
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expect(Array.isArray(resources)).toBe(true);
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expect(resources).toContain('mcp://xcodebuild/simulators');
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});
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it('should return non-empty array', () => {
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const resources = getAvailableResources();
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expect(resources.length).toBeGreaterThan(0);
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});
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});
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describe('registerResources', () => {
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it('should register simulators resource with correct parameters', () => {
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registerResources(mockServer);
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expect(mockServer.resource).toHaveBeenCalledWith(
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'mcp://xcodebuild/simulators',
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'Available iOS simulators with their UUIDs and states',
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{ mimeType: 'application/json' },
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expect.any(Function),
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);
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});
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it('should call server.resource once for each resource', () => {
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registerResources(mockServer);
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expect(mockServer.resource).toHaveBeenCalledTimes(1);
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});
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});
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describe('Simulators Resource Handler', () => {
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let resourceHandler: () => Promise<{ contents: Array<{ type: 'text'; text: string }> }>;
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beforeEach(() => {
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registerResources(mockServer);
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// Extract the handler function from the mock call
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const calls = vi.mocked(mockServer.resource).mock.calls;
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resourceHandler = calls[0][3]; // Fourth parameter is the handler
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});
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it('should handle successful simulator data retrieval', async () => {
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// Mock successful command execution
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setTimeout(() => {
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mockProcess.stdout.emit(
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'data',
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JSON.stringify({
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devices: {
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'iOS 17.0': [
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{
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name: 'iPhone 15 Pro',
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udid: 'ABC123-DEF456-GHI789',
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state: 'Shutdown',
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isAvailable: true,
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},
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],
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},
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}),
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);
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].type).toBe('text');
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expect(result.contents[0].text).toContain('Available iOS Simulators:');
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expect(result.contents[0].text).toContain('iPhone 15 Pro');
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expect(result.contents[0].text).toContain('ABC123-DEF456-GHI789');
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});
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it('should handle command execution failure', async () => {
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// Mock command failure
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setTimeout(() => {
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mockProcess.stderr.emit('data', 'Command failed');
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mockProcess.emit('close', 1);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].type).toBe('text');
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expect(result.contents[0].text).toContain('Error retrieving simulator data');
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});
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it('should handle JSON parsing errors', async () => {
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// Mock invalid JSON response
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setTimeout(() => {
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mockProcess.stdout.emit('data', 'invalid json');
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].type).toBe('text');
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expect(result.contents[0].text).toBe('invalid json');
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});
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it('should handle spawn errors', async () => {
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// Mock spawn error
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setTimeout(() => {
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mockProcess.emit('error', new Error('spawn xcrun ENOENT'));
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}, 0);
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const result = await resourceHandler();
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].type).toBe('text');
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expect(result.contents[0].text).toContain('Error retrieving simulator data');
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expect(result.contents[0].text).toContain('spawn xcrun ENOENT');
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});
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it('should handle empty simulator data', async () => {
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// Mock empty simulator response
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setTimeout(() => {
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mockProcess.stdout.emit('data', JSON.stringify({ devices: {} }));
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].type).toBe('text');
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expect(result.contents[0].text).toContain('Available iOS Simulators:');
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});
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it('should handle booted simulators correctly', async () => {
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// Mock simulator with booted state
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setTimeout(() => {
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mockProcess.stdout.emit(
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'data',
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JSON.stringify({
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devices: {
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'iOS 17.0': [
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{
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name: 'iPhone 15 Pro',
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udid: 'ABC123-DEF456-GHI789',
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state: 'Booted',
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isAvailable: true,
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},
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],
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},
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}),
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);
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents[0].text).toContain('[Booted]');
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});
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it('should filter out unavailable simulators', async () => {
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// Mock mix of available and unavailable simulators
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setTimeout(() => {
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mockProcess.stdout.emit(
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'data',
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JSON.stringify({
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devices: {
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'iOS 17.0': [
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{
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name: 'iPhone 15 Pro',
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udid: 'ABC123-DEF456-GHI789',
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state: 'Shutdown',
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isAvailable: true,
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},
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{
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name: 'iPhone 14',
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udid: 'XYZ789-UVW456-RST123',
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state: 'Shutdown',
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isAvailable: false,
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},
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],
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},
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}),
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);
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents[0].text).toContain('iPhone 15 Pro');
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expect(result.contents[0].text).not.toContain('iPhone 14');
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});
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it('should include next steps guidance', async () => {
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// Mock successful response
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setTimeout(() => {
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mockProcess.stdout.emit(
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'data',
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JSON.stringify({
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devices: {
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'iOS 17.0': [
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{
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name: 'iPhone 15 Pro',
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udid: 'ABC123-DEF456-GHI789',
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state: 'Shutdown',
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isAvailable: true,
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},
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],
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},
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}),
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);
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mockProcess.emit('close', 0);
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}, 0);
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const result = await resourceHandler();
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expect(result.contents[0].text).toContain('Next Steps:');
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expect(result.contents[0].text).toContain('boot_sim');
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expect(result.contents[0].text).toContain('open_sim');
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expect(result.contents[0].text).toContain('build_ios_sim_id_proj');
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expect(result.contents[0].text).toContain('get_sim_app_path_id_proj');
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});
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});
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});

‎src/core/resources.ts‎

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/**
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* Resource Management - MCP Resource handlers and URI management
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*
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* This module manages MCP resources, providing a unified interface for exposing
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* data through the Model Context Protocol resource system. Resources allow clients
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* to access data via URI references without requiring tool calls.
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*
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* Responsibilities:
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* - Defining resource URI schemes and handlers
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* - Managing resource registration with the MCP server
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* - Providing fallback compatibility for clients without resource support
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* - Integrating with existing tool logic through dependency injection
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*/
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import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
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import { log, getDefaultCommandExecutor } from '../utils/index.js';
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import { list_simsLogic } from '../plugins/simulator-shared/list_sims.js';
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/**
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* Resource URI schemes supported by XcodeBuildMCP
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*/
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export const RESOURCE_URIS = {
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SIMULATORS: 'mcp://xcodebuild/simulators',
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} as const;
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/**
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* Check if a client supports MCP resources
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* This is a placeholder for actual capability detection
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*/
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export function supportsResources(): boolean {
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// In a real implementation, this would check client capabilities
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// For now, assume resources are supported
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return true;
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}
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/**
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* Resource handler for simulator data
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* Uses existing list_simsLogic to maintain consistency
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*/
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async function handleSimulatorsResource(): Promise<{
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contents: Array<{ type: 'text'; text: string }>;
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}> {
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try {
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log('info', 'Processing simulators resource request');
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// Use existing logic with dependency injection
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const result = await list_simsLogic({}, getDefaultCommandExecutor());
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if (result.isError) {
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throw new Error(result.content[0]?.text || 'Failed to retrieve simulator data');
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}
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return {
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contents: [
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{
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type: 'text' as const,
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text: result.content[0]?.text || 'No simulator data available',
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},
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],
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};
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} catch (error) {
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const errorMessage = error instanceof Error ? error.message : String(error);
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log('error', `Error in simulators resource handler: ${errorMessage}`);
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return {
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contents: [
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{
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type: 'text' as const,
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text: `Error retrieving simulator data: ${errorMessage}`,
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},
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],
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};
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}
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}
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/**
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* Register all resources with the MCP server
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* @param server The MCP server instance
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*/
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export function registerResources(server: McpServer): void {
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log('info', 'Registering MCP resources');
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// Register simulators resource
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server.resource(
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RESOURCE_URIS.SIMULATORS,
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'Available iOS simulators with their UUIDs and states',
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{ mimeType: 'application/json' },
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handleSimulatorsResource,
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);
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log('info', `Registered resource: ${RESOURCE_URIS.SIMULATORS}`);
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}
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/**
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* Get all available resource URIs
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* @returns Array of resource URI strings
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*/
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export function getAvailableResources(): string[] {
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return Object.values(RESOURCE_URIS);
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}

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