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app/chrome-extension/common/constants.ts

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+/**
+ * Chrome Extension Constants
+ * Centralized configuration values and magic constants
+ */
+
+// Native Host Configuration
+export const NATIVE_HOST = {
+  NAME: 'com.chromemcp.nativehost',
+  DEFAULT_PORT: 12306,
+} as const;
+
+// Chrome Extension Icons
+export const ICONS = {
+  NOTIFICATION: 'icon/48.png',
+} as const;
+
+// Timeouts and Delays (in milliseconds)
+export const TIMEOUTS = {
+  DEFAULT_WAIT: 1000,
+  NETWORK_CAPTURE_MAX: 30000,
+  NETWORK_CAPTURE_IDLE: 3000,
+  SCREENSHOT_DELAY: 100,
+  KEYBOARD_DELAY: 50,
+  CLICK_DELAY: 100,
+} as const;
+
+// Limits and Thresholds
+export const LIMITS = {
+  MAX_NETWORK_REQUESTS: 100,
+  MAX_SEARCH_RESULTS: 50,
+  MAX_BOOKMARK_RESULTS: 100,
+  MAX_HISTORY_RESULTS: 100,
+  SIMILARITY_THRESHOLD: 0.1,
+  VECTOR_DIMENSIONS: 384,
+} as const;
+
+// Error Messages
+export const ERROR_MESSAGES = {
+  NATIVE_CONNECTION_FAILED: 'Failed to connect to native host',
+  NATIVE_DISCONNECTED: 'Native connection disconnected',
+  SERVER_STATUS_LOAD_FAILED: 'Failed to load server status',
+  SERVER_STATUS_SAVE_FAILED: 'Failed to save server status',
+  TOOL_EXECUTION_FAILED: 'Tool execution failed',
+  INVALID_PARAMETERS: 'Invalid parameters provided',
+  PERMISSION_DENIED: 'Permission denied',
+  TAB_NOT_FOUND: 'Tab not found',
+  ELEMENT_NOT_FOUND: 'Element not found',
+  NETWORK_ERROR: 'Network error occurred',
+} as const;
+
+// Success Messages
+export const SUCCESS_MESSAGES = {
+  TOOL_EXECUTED: 'Tool executed successfully',
+  CONNECTION_ESTABLISHED: 'Connection established',
+  SERVER_STARTED: 'Server started successfully',
+  SERVER_STOPPED: 'Server stopped successfully',
+} as const;
+
+// File Extensions and MIME Types
+export const FILE_TYPES = {
+  STATIC_EXTENSIONS: [
+    '.css',
+    '.js',
+    '.png',
+    '.jpg',
+    '.jpeg',
+    '.gif',
+    '.svg',
+    '.ico',
+    '.woff',
+    '.woff2',
+    '.ttf',
+  ],
+  FILTERED_MIME_TYPES: ['text/html', 'text/css', 'text/javascript', 'application/javascript'],
+  IMAGE_FORMATS: ['png', 'jpeg', 'webp'] as const,
+} as const;
+
+// Network Filtering
+export const NETWORK_FILTERS = {
+  EXCLUDED_DOMAINS: [
+    'google-analytics.com',
+    'googletagmanager.com',
+    'facebook.com',
+    'doubleclick.net',
+    'googlesyndication.com',
+  ],
+  STATIC_RESOURCE_TYPES: ['stylesheet', 'image', 'font', 'media', 'other'],
+} as const;
+
+// Semantic Similarity Configuration
+export const SEMANTIC_CONFIG = {
+  DEFAULT_MODEL: 'sentence-transformers/all-MiniLM-L6-v2',
+  CHUNK_SIZE: 512,
+  CHUNK_OVERLAP: 50,
+  BATCH_SIZE: 32,
+  CACHE_SIZE: 1000,
+} as const;
+
+// Storage Keys
+export const STORAGE_KEYS = {
+  SERVER_STATUS: 'serverStatus',
+  SEMANTIC_MODEL: 'selectedModel',
+  USER_PREFERENCES: 'userPreferences',
+  VECTOR_INDEX: 'vectorIndex',
+} as const;
+
+// Notification Configuration
+export const NOTIFICATIONS = {
+  PRIORITY: 2,
+  TYPE: 'basic' as const,
+} as const;
+
+export enum ExecutionWorld {
+  ISOLATED = 'ISOLATED',
+  MAIN = 'MAIN',
+}

app/chrome-extension/common/message-types.ts

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+/**
+ * Consolidated message type constants for Chrome extension communication
+ * Note: Native message types are imported from the shared package
+ */
+
+// Message targets for routing
+export enum MessageTarget {
+  Offscreen = 'offscreen',
+  ContentScript = 'content_script',
+  Background = 'background',
+}
+
+// Background script message types
+export const BACKGROUND_MESSAGE_TYPES = {
+  SWITCH_SEMANTIC_MODEL: 'switch_semantic_model',
+  GET_MODEL_STATUS: 'get_model_status',
+  UPDATE_MODEL_STATUS: 'update_model_status',
+  GET_STORAGE_STATS: 'get_storage_stats',
+  CLEAR_ALL_DATA: 'clear_all_data',
+  GET_SERVER_STATUS: 'get_server_status',
+  REFRESH_SERVER_STATUS: 'refresh_server_status',
+  SERVER_STATUS_CHANGED: 'server_status_changed',
+  INITIALIZE_SEMANTIC_ENGINE: 'initialize_semantic_engine',
+} as const;
+
+// Offscreen message types
+export const OFFSCREEN_MESSAGE_TYPES = {
+  SIMILARITY_ENGINE_INIT: 'similarityEngineInit',
+  SIMILARITY_ENGINE_COMPUTE: 'similarityEngineCompute',
+  SIMILARITY_ENGINE_BATCH_COMPUTE: 'similarityEngineBatchCompute',
+  SIMILARITY_ENGINE_STATUS: 'similarityEngineStatus',
+} as const;
+
+// Content script message types
+export const CONTENT_MESSAGE_TYPES = {
+  WEB_FETCHER_GET_TEXT_CONTENT: 'webFetcherGetTextContent',
+  WEB_FETCHER_GET_HTML_CONTENT: 'getHtmlContent',
+  NETWORK_CAPTURE_PING: 'network_capture_ping',
+  CLICK_HELPER_PING: 'click_helper_ping',
+  FILL_HELPER_PING: 'fill_helper_ping',
+  KEYBOARD_HELPER_PING: 'keyboard_helper_ping',
+  SCREENSHOT_HELPER_PING: 'screenshot_helper_ping',
+  INTERACTIVE_ELEMENTS_HELPER_PING: 'interactive_elements_helper_ping',
+} as const;
+
+// Tool action message types (for chrome.runtime.sendMessage)
+export const TOOL_MESSAGE_TYPES = {
+  // Screenshot related
+  SCREENSHOT_PREPARE_PAGE_FOR_CAPTURE: 'preparePageForCapture',
+  SCREENSHOT_GET_PAGE_DETAILS: 'getPageDetails',
+  SCREENSHOT_GET_ELEMENT_DETAILS: 'getElementDetails',
+  SCREENSHOT_SCROLL_PAGE: 'scrollPage',
+  SCREENSHOT_RESET_PAGE_AFTER_CAPTURE: 'resetPageAfterCapture',
+
+  // Web content fetching
+  WEB_FETCHER_GET_HTML_CONTENT: 'getHtmlContent',
+  WEB_FETCHER_GET_TEXT_CONTENT: 'getTextContent',
+
+  // User interactions
+  CLICK_ELEMENT: 'clickElement',
+  FILL_ELEMENT: 'fillElement',
+  SIMULATE_KEYBOARD: 'simulateKeyboard',
+
+  // Interactive elements
+  GET_INTERACTIVE_ELEMENTS: 'getInteractiveElements',
+
+  // Network requests
+  NETWORK_SEND_REQUEST: 'sendPureNetworkRequest',
+
+  // Semantic similarity engine
+  SIMILARITY_ENGINE_INIT: 'similarityEngineInit',
+  SIMILARITY_ENGINE_COMPUTE_BATCH: 'similarityEngineComputeBatch',
+} as const;
+
+// Type unions for type safety
+export type BackgroundMessageType =
+  (typeof BACKGROUND_MESSAGE_TYPES)[keyof typeof BACKGROUND_MESSAGE_TYPES];
+export type OffscreenMessageType =
+  (typeof OFFSCREEN_MESSAGE_TYPES)[keyof typeof OFFSCREEN_MESSAGE_TYPES];
+export type ContentMessageType = (typeof CONTENT_MESSAGE_TYPES)[keyof typeof CONTENT_MESSAGE_TYPES];
+export type ToolMessageType = (typeof TOOL_MESSAGE_TYPES)[keyof typeof TOOL_MESSAGE_TYPES];
+
+// Legacy enum for backward compatibility (will be deprecated)
+export enum SendMessageType {
+  // Screenshot related message types
+  ScreenshotPreparePageForCapture = 'preparePageForCapture',
+  ScreenshotGetPageDetails = 'getPageDetails',
+  ScreenshotGetElementDetails = 'getElementDetails',
+  ScreenshotScrollPage = 'scrollPage',
+  ScreenshotResetPageAfterCapture = 'resetPageAfterCapture',
+
+  // Web content fetching related message types
+  WebFetcherGetHtmlContent = 'getHtmlContent',
+  WebFetcherGetTextContent = 'getTextContent',
+
+  // Click related message types
+  ClickElement = 'clickElement',
+
+  // Input filling related message types
+  FillElement = 'fillElement',
+
+  // Interactive elements related message types
+  GetInteractiveElements = 'getInteractiveElements',
+
+  // Network request capture related message types
+  NetworkSendRequest = 'sendPureNetworkRequest',
+
+  // Keyboard event related message types
+  SimulateKeyboard = 'simulateKeyboard',
+
+  // Semantic similarity engine related message types
+  SimilarityEngineInit = 'similarityEngineInit',
+  SimilarityEngineComputeBatch = 'similarityEngineComputeBatch',
+}

app/chrome-extension/common/tool-handler.ts

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+import type { CallToolResult, TextContent, ImageContent } from '@modelcontextprotocol/sdk/types.js';
+
+export interface ToolResult extends CallToolResult {
+  content: (TextContent | ImageContent)[];
+  isError: boolean;
+}
+
+export interface ToolExecutor {
+  execute(args: any): Promise<ToolResult>;
+}
+
+export const createErrorResponse = (
+  message: string = 'Unknown error, please try again',
+): ToolResult => {
+  return {
+    content: [
+      {
+        type: 'text',
+        text: message,
+      },
+    ],
+    isError: true,
+  };
+};