diff --git a/packages/plugins/src/debug/debug.test.ts b/packages/plugins/src/debug/debug.test.ts
new file mode 100644
index 0000000..cb7adbf
--- /dev/null
+++ b/packages/plugins/src/debug/debug.test.ts
@@ -0,0 +1,235 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { SDK } from '@lytics/sdk-kit';
+import { debugPlugin } from './debug';
+
+describe('Debug Plugin', () => {
+  let sdk: SDK;
+
+  beforeEach(() => {
+    sdk = new SDK({ debug: { enabled: true, console: true, window: true } });
+  });
+
+  describe('Plugin Registration', () => {
+    it('should register without errors', () => {
+      expect(() => sdk.use(debugPlugin)).not.toThrow();
+    });
+
+    it('should expose debug API', () => {
+      sdk.use(debugPlugin);
+
+      expect(sdk.debug).toBeDefined();
+      expect(sdk.debug.log).toBeTypeOf('function');
+      expect(sdk.debug.isEnabled).toBeTypeOf('function');
+    });
+  });
+
+  describe('Configuration', () => {
+    it('should respect debug.enabled config', () => {
+      const disabledSdk = new SDK({ debug: { enabled: false } });
+      disabledSdk.use(debugPlugin);
+
+      expect(disabledSdk.debug.isEnabled()).toBe(false);
+    });
+
+    it('should default to disabled', () => {
+      const defaultSdk = new SDK();
+      defaultSdk.use(debugPlugin);
+
+      expect(defaultSdk.debug.isEnabled()).toBe(false);
+    });
+
+    it('should respect debug.console config', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      const consoleEnabledSdk = new SDK({ debug: { enabled: true, console: true } });
+      consoleEnabledSdk.use(debugPlugin);
+      consoleEnabledSdk.debug.log('test message');
+
+      expect(consoleSpy).toHaveBeenCalledWith('[experiences] test message', '');
+      consoleSpy.mockRestore();
+    });
+
+    it('should not log to console when disabled', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      const consoleDisabledSdk = new SDK({ debug: { enabled: true, console: false } });
+      consoleDisabledSdk.use(debugPlugin);
+      consoleDisabledSdk.debug.log('test message');
+
+      expect(consoleSpy).not.toHaveBeenCalled();
+      consoleSpy.mockRestore();
+    });
+  });
+
+  describe('Window Events', () => {
+    it('should emit window events when enabled', () => {
+      if (typeof window === 'undefined') {
+        // Skip in non-browser environment
+        return;
+      }
+
+      const eventHandler = vi.fn();
+      window.addEventListener('experience-sdk:debug', eventHandler);
+
+      sdk.use(debugPlugin);
+      sdk.debug.log('test message', { foo: 'bar' });
+
+      expect(eventHandler).toHaveBeenCalled();
+      const event = eventHandler.mock.calls[0][0] as CustomEvent;
+      expect(event.detail).toMatchObject({
+        message: 'test message',
+        data: { foo: 'bar' },
+      });
+      expect(event.detail.timestamp).toBeDefined();
+
+      window.removeEventListener('experience-sdk:debug', eventHandler);
+    });
+
+    it('should not emit window events when debug is disabled', () => {
+      if (typeof window === 'undefined') {
+        return;
+      }
+
+      const eventHandler = vi.fn();
+      window.addEventListener('experience-sdk:debug', eventHandler);
+
+      const disabledSdk = new SDK({ debug: { enabled: false } });
+      disabledSdk.use(debugPlugin);
+      disabledSdk.debug.log('test message');
+
+      expect(eventHandler).not.toHaveBeenCalled();
+
+      window.removeEventListener('experience-sdk:debug', eventHandler);
+    });
+
+    it('should not emit window events when window is disabled', () => {
+      if (typeof window === 'undefined') {
+        return;
+      }
+
+      const eventHandler = vi.fn();
+      window.addEventListener('experience-sdk:debug', eventHandler);
+
+      const windowDisabledSdk = new SDK({ debug: { enabled: true, window: false } });
+      windowDisabledSdk.use(debugPlugin);
+      windowDisabledSdk.debug.log('test message');
+
+      expect(eventHandler).not.toHaveBeenCalled();
+
+      window.removeEventListener('experience-sdk:debug', eventHandler);
+    });
+  });
+
+  describe('Event Listening', () => {
+    it('should listen to experiences:ready event', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      sdk.use(debugPlugin);
+      sdk.emit('experiences:ready');
+
+      expect(consoleSpy).toHaveBeenCalledWith(
+        '[experiences] SDK initialized and ready',
+        ''
+      );
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should listen to experiences:registered event', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      sdk.use(debugPlugin);
+      const payload = { id: 'test', experience: { type: 'banner' } };
+      sdk.emit('experiences:registered', payload);
+
+      expect(consoleSpy).toHaveBeenCalledWith(
+        '[experiences] Experience registered',
+        payload
+      );
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should listen to experiences:evaluated event', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      sdk.use(debugPlugin);
+      const decision = { show: true, experienceId: 'test' };
+      sdk.emit('experiences:evaluated', decision);
+
+      expect(consoleSpy).toHaveBeenCalledWith('[experiences] Experience evaluated', decision);
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should not log when debug is disabled', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      const disabledSdk = new SDK({ debug: { enabled: false } });
+      disabledSdk.use(debugPlugin);
+      disabledSdk.emit('experiences:ready');
+
+      expect(consoleSpy).not.toHaveBeenCalled();
+
+      consoleSpy.mockRestore();
+    });
+  });
+
+  describe('debug.log() method', () => {
+    it('should log message without data', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      sdk.use(debugPlugin);
+      sdk.debug.log('test message');
+
+      expect(consoleSpy).toHaveBeenCalledWith('[experiences] test message', '');
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should log message with data', () => {
+      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+      sdk.use(debugPlugin);
+      const data = { foo: 'bar', count: 42 };
+      sdk.debug.log('test message', data);
+
+      expect(consoleSpy).toHaveBeenCalledWith('[experiences] test message', data);
+
+      consoleSpy.mockRestore();
+    });
+
+    it('should include timestamp in window event', () => {
+      if (typeof window === 'undefined') {
+        return;
+      }
+
+      const eventHandler = vi.fn();
+      window.addEventListener('experience-sdk:debug', eventHandler);
+
+      sdk.use(debugPlugin);
+      sdk.debug.log('test message');
+
+      const event = eventHandler.mock.calls[0][0] as CustomEvent;
+      expect(event.detail.timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/);
+
+      window.removeEventListener('experience-sdk:debug', eventHandler);
+    });
+  });
+
+  describe('debug.isEnabled() method', () => {
+    it('should return true when enabled', () => {
+      sdk.use(debugPlugin);
+
+      expect(sdk.debug.isEnabled()).toBe(true);
+    });
+
+    it('should return false when disabled', () => {
+      const disabledSdk = new SDK({ debug: { enabled: false } });
+      disabledSdk.use(debugPlugin);
+
+      expect(disabledSdk.debug.isEnabled()).toBe(false);
+    });
+  });
+});
+
diff --git a/packages/plugins/src/debug/debug.ts b/packages/plugins/src/debug/debug.ts
new file mode 100644
index 0000000..ca1a19f
--- /dev/null
+++ b/packages/plugins/src/debug/debug.ts
@@ -0,0 +1,107 @@
+/**
+ * Debug Plugin
+ *
+ * Emits structured debug events to window and optionally logs to console.
+ * Useful for debugging and Chrome extension integration.
+ */
+
+import type { PluginFunction } from '@lytics/sdk-kit';
+
+export interface DebugPluginConfig {
+  debug?: {
+    enabled?: boolean;
+    console?: boolean;
+    window?: boolean;
+  };
+}
+
+export interface DebugPlugin {
+  log(message: string, data?: unknown): void;
+  isEnabled(): boolean;
+}
+
+/**
+ * Debug Plugin
+ *
+ * Listens to all SDK events and emits them as window events for debugging.
+ * Also optionally logs to console.
+ *
+ * @example
+ * ```typescript
+ * import { createInstance } from '@prosdevlab/experience-sdk';
+ * import { debugPlugin } from '@prosdevlab/experience-sdk-plugins';
+ *
+ * const sdk = createInstance({ debug: { enabled: true, console: true } });
+ * sdk.use(debugPlugin);
+ * ```
+ */
+export const debugPlugin: PluginFunction = (plugin, instance, config) => {
+  plugin.ns('debug');
+
+  // Set defaults
+  plugin.defaults({
+    debug: {
+      enabled: false,
+      console: false,
+      window: true,
+    },
+  });
+
+  // Helper to check if debug is enabled
+  const isEnabled = (): boolean => config.get('debug.enabled') ?? false;
+  const shouldLogConsole = (): boolean => config.get('debug.console') ?? false;
+  const shouldEmitWindow = (): boolean => config.get('debug.window') ?? true;
+
+  // Log function
+  const log = (message: string, data?: unknown): void => {
+    if (!isEnabled()) return;
+
+    const timestamp = new Date().toISOString();
+    const logData = {
+      timestamp,
+      message,
+      data,
+    };
+
+    // Console logging
+    if (shouldLogConsole()) {
+      console.log(`[experiences] ${message}`, data || '');
+    }
+
+    // Window event emission
+    if (shouldEmitWindow() && typeof window !== 'undefined') {
+      const event = new CustomEvent('experience-sdk:debug', {
+        detail: logData,
+      });
+      window.dispatchEvent(event);
+    }
+  };
+
+  // Expose debug API
+  plugin.expose({
+    debug: {
+      log,
+      isEnabled,
+    },
+  });
+
+  // If debug is enabled, listen to all events
+  if (isEnabled()) {
+    // Listen to experiences:* events
+    instance.on('experiences:ready', () => {
+      if (!isEnabled()) return;
+      log('SDK initialized and ready');
+    });
+
+    instance.on('experiences:registered', (payload) => {
+      if (!isEnabled()) return;
+      log('Experience registered', payload);
+    });
+
+    instance.on('experiences:evaluated', (payload) => {
+      if (!isEnabled()) return;
+      log('Experience evaluated', payload);
+    });
+  }
+};
+
diff --git a/packages/plugins/src/debug/index.ts b/packages/plugins/src/debug/index.ts
new file mode 100644
index 0000000..0dbf4dc
--- /dev/null
+++ b/packages/plugins/src/debug/index.ts
@@ -0,0 +1,7 @@
+/**
+ * Debug Plugin - Barrel Export
+ */
+
+export type { DebugPlugin, DebugPluginConfig } from './debug';
+export { debugPlugin } from './debug';
+
diff --git a/packages/plugins/src/index.ts b/packages/plugins/src/index.ts
index 0125bac..3fc11ae 100644
--- a/packages/plugins/src/index.ts
+++ b/packages/plugins/src/index.ts
@@ -1,4 +1,7 @@
-// Placeholder for plugins package
-// Will be implemented in Phase 0
+/**
+ * Experience SDK Plugins
+ *
+ * Official plugins for Experience SDK
+ */
 
-export {};
+export * from './debug';