reset_viewport

Instructions

Implementation Reference

• src/tools/emulation.ts:82-93 (handler)

  Handler function that sends a 'reset_viewport' command via WebSocket bridge and returns success/error response.

  async ({ tabId, apiKey }) => {
    const result = await bridge.sendCommand({
      command: 'reset_viewport',
      params: {},
      tabId,
      apiKey,
    });
    if (!result.success) {
      return { content: [{ type: 'text', text: `Error: ${result.error?.message}` }], isError: true };
    }
    return { content: [{ type: 'text', text: 'Viewport reset to default' }] };
  }

• src/tools/emulation.ts:78-81 (schema)

  Input schema for reset_viewport: accepts optional tabId and apiKey.

  {
    tabId: z.number().optional().describe('Target tab ID (defaults to currently active tab)'),
    apiKey: z.string().optional().describe('API key for authentication if enabled'),
  },

• src/tools/emulation.ts:75-94 (registration)

  Registration of the 'reset_viewport' tool via server.tool() with name, description, schema, and handler.

  server.tool(
    'reset_viewport',
    'Reset viewport emulation to the browser\'s default size and user agent.',
    {
      tabId: z.number().optional().describe('Target tab ID (defaults to currently active tab)'),
      apiKey: z.string().optional().describe('API key for authentication if enabled'),
    },
    async ({ tabId, apiKey }) => {
      const result = await bridge.sendCommand({
        command: 'reset_viewport',
        params: {},
        tabId,
        apiKey,
      });
      if (!result.success) {
        return { content: [{ type: 'text', text: `Error: ${result.error?.message}` }], isError: true };
      }
      return { content: [{ type: 'text', text: 'Viewport reset to default' }] };
    }
  );

• src/websocket-bridge.ts:63-103 (helper)

  WebSocketBridge.sendCommand sends the command over WebSocket to the Chrome extension which processes 'reset_viewport' on the browser side.

  async sendCommand(cmd: BridgeCommand): Promise<BridgeResponse> {
    if (!this.isConnected()) {
      return {
        success: false,
        error: {
          code: 'NOT_CONNECTED',
          message: 'Chrome extension is not connected. Ensure the extension is installed, enabled, and the browser is running.',
        },
      };
    }
  
    const id = crypto.randomUUID();
    const timeout = cmd.timeout ?? DEFAULT_TIMEOUT;
  
    return new Promise<BridgeResponse>((resolve, reject) => {
      const timer = setTimeout(() => {
        this.pending.delete(id);
        resolve({
          success: false,
          error: {
            code: 'TIMEOUT',
            message: `Command '${cmd.command}' timed out after ${timeout}ms`,
          },
        });
      }, timeout);
  
      this.pending.set(id, { resolve, reject, timer });
  
      const message = {
        id,
        type: 'request',
        command: cmd.command,
        params: cmd.params,
        tabId: cmd.tabId,
        apiKey: cmd.apiKey,
        timestamp: Date.now(),
      };
  
      this.client!.send(JSON.stringify(message));
    });
  }