diff --git a/plugin/calendar/scheduler.d.ts b/plugin/calendar/scheduler.d.ts
index 07d4075..5a89747 100644
--- a/plugin/calendar/scheduler.d.ts
+++ b/plugin/calendar/scheduler.d.ts
@@ -2,6 +2,7 @@
  * HarborForge Calendar Scheduler
  *
  * PLG-CAL-002: Plugin-side handling for pending slot execution.
+ * PLG-CAL-004: ScheduledGatewayRestart event handling with state persistence.
  *
  * Responsibilities:
  *   - Run calendar heartbeat every minute
@@ -9,6 +10,8 @@
  *   - Wake agent with task context
  *   - Handle slot status transitions (attended, ongoing, deferred)
  *   - Manage agent status transitions (idle → busy/on_call)
+ *   - Persist state on ScheduledGatewayRestart and restore on startup
+ *   - Send final heartbeat before graceful shutdown
  *
  * Design reference: NEXT_WAVE_DEV_DIRECTION.md §6 (Agent wakeup mechanism)
  */
@@ -32,6 +35,8 @@ export interface CalendarSchedulerConfig {
     heartbeatIntervalMs?: number;
     /** Enable verbose debug logging */
     debug?: boolean;
+    /** Directory for state persistence (default: plugin data dir) */
+    stateDir?: string;
 }
 /**
  * Context passed to agent when waking for slot execution.
@@ -63,6 +68,8 @@ interface SchedulerState {
     deferredSlotIds: Set<string>;
     /** Whether agent is currently processing a slot */
     isProcessing: boolean;
+    /** Whether a gateway restart is scheduled/pending */
+    isRestartPending: boolean;
 }
 /**
  * CalendarScheduler manages the periodic heartbeat and slot execution lifecycle.
@@ -70,7 +77,33 @@ interface SchedulerState {
 export declare class CalendarScheduler {
     private config;
     private state;
+    private stateFilePath;
     constructor(config: CalendarSchedulerConfig);
+    /**
+     * Get default state directory (plugin data directory or temp fallback).
+     */
+    private getDefaultStateDir;
+    /**
+     * Persist current state to disk for recovery after restart.
+     */
+    private persistState;
+    /**
+     * Restore state from disk if available.
+     */
+    private restoreState;
+    /**
+     * Clear persisted state file after successful restore.
+     */
+    private clearPersistedState;
+    /**
+     * Send a final heartbeat to the backend before shutdown.
+     */
+    private sendFinalHeartbeat;
+    /**
+     * Handle ScheduledGatewayRestart event.
+     * PLG-CAL-004: Persist state, send final heartbeat, pause scheduled tasks.
+     */
+    private handleScheduledGatewayRestart;
     /**
      * Start the calendar scheduler.
      * Begins periodic heartbeat to check for pending slots.
@@ -96,6 +129,10 @@ export declare class CalendarScheduler {
      * Select highest priority slot and wake agent.
      */
     private handleIdleAgent;
+    /**
+     * Check if a slot is a ScheduledGatewayRestart system event.
+     */
+    private isScheduledGatewayRestart;
     /**
      * Execute a slot by waking the agent.
      */
@@ -181,6 +218,14 @@ export declare class CalendarScheduler {
      * Get the current slot being executed (if any).
      */
     getCurrentSlot(): CalendarSlotResponse | null;
+    /**
+     * Check if a gateway restart is pending.
+     */
+    isRestartPending(): boolean;
+    /**
+     * Get the path to the state file.
+     */
+    getStateFilePath(): string;
 }
 /**
  * Factory function to create a CalendarScheduler from plugin context.
diff --git a/plugin/calendar/scheduler.d.ts.map b/plugin/calendar/scheduler.d.ts.map
index 376a07e..c946280 100644
--- a/plugin/calendar/scheduler.d.ts.map
+++ b/plugin/calendar/scheduler.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
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diff --git a/plugin/calendar/scheduler.js b/plugin/calendar/scheduler.js
index 940c2fb..794e246 100644
--- a/plugin/calendar/scheduler.js
+++ b/plugin/calendar/scheduler.js
@@ -3,6 +3,7 @@
  * HarborForge Calendar Scheduler
  *
  * PLG-CAL-002: Plugin-side handling for pending slot execution.
+ * PLG-CAL-004: ScheduledGatewayRestart event handling with state persistence.
  *
  * Responsibilities:
  *   - Run calendar heartbeat every minute
@@ -10,25 +11,36 @@
  *   - Wake agent with task context
  *   - Handle slot status transitions (attended, ongoing, deferred)
  *   - Manage agent status transitions (idle → busy/on_call)
+ *   - Persist state on ScheduledGatewayRestart and restore on startup
+ *   - Send final heartbeat before graceful shutdown
  *
  * Design reference: NEXT_WAVE_DEV_DIRECTION.md §6 (Agent wakeup mechanism)
  */
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.CalendarScheduler = void 0;
 exports.createCalendarScheduler = createCalendarScheduler;
+const fs_1 = require("fs");
+const path_1 = require("path");
 const types_1 = require("./types");
+/** State file name */
+const STATE_FILENAME = 'calendar-scheduler-state.json';
+/** State file version for migration compatibility */
+const STATE_VERSION = 1;
 /**
  * CalendarScheduler manages the periodic heartbeat and slot execution lifecycle.
  */
 class CalendarScheduler {
     config;
     state;
+    stateFilePath;
     constructor(config) {
         this.config = {
             heartbeatIntervalMs: 60000, // 1 minute default
             debug: false,
+            stateDir: this.getDefaultStateDir(),
             ...config,
         };
+        this.stateFilePath = (0, path_1.join)(this.config.stateDir, STATE_FILENAME);
         this.state = {
             isRunning: false,
             currentSlot: null,
@@ -36,7 +48,162 @@ class CalendarScheduler {
             intervalHandle: null,
             deferredSlotIds: new Set(),
             isProcessing: false,
+            isRestartPending: false,
         };
+        // Attempt to restore state from previous persistence
+        this.restoreState();
+    }
+    /**
+     * Get default state directory (plugin data directory or temp fallback).
+     */
+    getDefaultStateDir() {
+        // Try to use the plugin's directory or a standard data location
+        const candidates = [
+            process.env.OPENCLAW_PLUGIN_DATA_DIR,
+            process.env.HARBORFORGE_PLUGIN_DIR,
+            (0, path_1.join)(process.cwd(), '.harborforge'),
+            (0, path_1.join)(process.cwd(), 'data'),
+            '/tmp/harborforge',
+        ];
+        for (const dir of candidates) {
+            if (dir) {
+                try {
+                    if (!(0, fs_1.existsSync)(dir)) {
+                        (0, fs_1.mkdirSync)(dir, { recursive: true });
+                    }
+                    // Test write access
+                    const testFile = (0, path_1.join)(dir, '.write-test');
+                    (0, fs_1.writeFileSync)(testFile, '', { flag: 'w' });
+                    return dir;
+                }
+                catch {
+                    continue;
+                }
+            }
+        }
+        // Fallback to current working directory
+        return process.cwd();
+    }
+    /**
+     * Persist current state to disk for recovery after restart.
+     */
+    persistState(reason) {
+        try {
+            const persistedState = {
+                version: STATE_VERSION,
+                persistedAt: new Date().toISOString(),
+                reason,
+                currentSlot: this.state.currentSlot,
+                deferredSlotIds: Array.from(this.state.deferredSlotIds),
+                isProcessing: this.state.isProcessing,
+                agentStatus: null, // Will be determined at restore time
+            };
+            (0, fs_1.writeFileSync)(this.stateFilePath, JSON.stringify(persistedState, null, 2));
+            this.config.logger.info(`[PLG-CAL-004] State persisted to ${this.stateFilePath} (reason: ${reason})`);
+        }
+        catch (err) {
+            this.config.logger.error('[PLG-CAL-004] Failed to persist state:', err);
+        }
+    }
+    /**
+     * Restore state from disk if available.
+     */
+    restoreState() {
+        try {
+            if (!(0, fs_1.existsSync)(this.stateFilePath)) {
+                return;
+            }
+            const data = (0, fs_1.readFileSync)(this.stateFilePath, 'utf-8');
+            const persisted = JSON.parse(data);
+            // Validate version
+            if (persisted.version !== STATE_VERSION) {
+                this.config.logger.warn(`[PLG-CAL-004] State version mismatch: ${persisted.version} vs ${STATE_VERSION}`);
+                this.clearPersistedState();
+                return;
+            }
+            // Restore deferred slot IDs
+            if (persisted.deferredSlotIds && persisted.deferredSlotIds.length > 0) {
+                this.state.deferredSlotIds = new Set(persisted.deferredSlotIds);
+                this.config.logger.info(`[PLG-CAL-004] Restored ${persisted.deferredSlotIds.length} deferred slot(s)`);
+            }
+            // If there was a slot in progress, mark it for replanning
+            if (persisted.isProcessing && persisted.currentSlot) {
+                this.config.logger.warn(`[PLG-CAL-004] Previous session had in-progress slot: ${this.getSlotId(persisted.currentSlot)}`);
+                // The slot will be picked up by the next heartbeat and can be resumed or deferred
+            }
+            this.config.logger.info(`[PLG-CAL-004] State restored from ${persisted.persistedAt} (reason: ${persisted.reason})`);
+            // Clear the persisted state after successful restore
+            this.clearPersistedState();
+        }
+        catch (err) {
+            this.config.logger.error('[PLG-CAL-004] Failed to restore state:', err);
+        }
+    }
+    /**
+     * Clear persisted state file after successful restore.
+     */
+    clearPersistedState() {
+        try {
+            if ((0, fs_1.existsSync)(this.stateFilePath)) {
+                // In a real implementation, we might want to archive instead of delete
+                // For now, we'll just clear the content to mark as processed
+                (0, fs_1.writeFileSync)(this.stateFilePath, JSON.stringify({ restored: true, at: new Date().toISOString() }));
+            }
+        }
+        catch (err) {
+            this.config.logger.error('[PLG-CAL-004] Failed to clear persisted state:', err);
+        }
+    }
+    /**
+     * Send a final heartbeat to the backend before shutdown.
+     */
+    async sendFinalHeartbeat(reason) {
+        try {
+            this.config.logger.info(`[PLG-CAL-004] Sending final heartbeat (reason: ${reason})`);
+            // Send agent status update indicating we're going offline
+            await this.config.bridge.reportAgentStatus({ status: 'offline' });
+            this.config.logger.info('[PLG-CAL-004] Final heartbeat sent successfully');
+        }
+        catch (err) {
+            this.config.logger.error('[PLG-CAL-004] Failed to send final heartbeat:', err);
+        }
+    }
+    /**
+     * Handle ScheduledGatewayRestart event.
+     * PLG-CAL-004: Persist state, send final heartbeat, pause scheduled tasks.
+     */
+    async handleScheduledGatewayRestart(slot) {
+        this.config.logger.info('[PLG-CAL-004] Handling ScheduledGatewayRestart event');
+        // 1. Mark restart as pending to prevent new slot processing
+        this.state.isRestartPending = true;
+        // 2. Persist current state
+        this.persistState('ScheduledGatewayRestart');
+        // 3. If there's a current slot, pause it gracefully
+        if (this.state.isProcessing && this.state.currentSlot) {
+            this.config.logger.info('[PLG-CAL-004] Pausing current slot before restart');
+            await this.pauseCurrentSlot();
+        }
+        // 4. Send final heartbeat
+        await this.sendFinalHeartbeat('ScheduledGatewayRestart');
+        // 5. Stop the scheduler (pause scheduled tasks)
+        this.config.logger.info('[PLG-CAL-004] Stopping scheduler due to gateway restart');
+        this.stop();
+        // 6. Mark the slot as finished (since we've handled the restart)
+        const update = {
+            status: types_1.SlotStatus.FINISHED,
+            actual_duration: 0, // Restart preparation doesn't take time
+        };
+        try {
+            if (slot.id) {
+                await this.config.bridge.updateSlot(slot.id, update);
+            }
+            else if (slot.virtual_id) {
+                await this.config.bridge.updateVirtualSlot(slot.virtual_id, update);
+            }
+        }
+        catch (err) {
+            this.config.logger.error('[PLG-CAL-004] Failed to mark restart slot as finished:', err);
+        }
     }
     /**
      * Start the calendar scheduler.
@@ -48,6 +215,7 @@ class CalendarScheduler {
             return;
         }
         this.state.isRunning = true;
+        this.state.isRestartPending = false;
         this.config.logger.info('Calendar scheduler started');
         // Run initial heartbeat immediately
         this.runHeartbeat();
@@ -74,6 +242,11 @@ class CalendarScheduler {
         if (!this.state.isRunning) {
             return;
         }
+        // Skip heartbeat if restart is pending
+        if (this.state.isRestartPending) {
+            this.logDebug('Heartbeat skipped: gateway restart pending');
+            return;
+        }
         this.state.lastHeartbeatAt = new Date();
         try {
             // Fetch pending slots from backend
@@ -130,7 +303,7 @@ class CalendarScheduler {
             return;
         }
         // Filter out already deferred slots in this session
-        const eligibleSlots = slots.filter(s => !this.state.deferredSlotIds.has(this.getSlotId(s)));
+        const eligibleSlots = slots.filter((s) => !this.state.deferredSlotIds.has(this.getSlotId(s)));
         if (eligibleSlots.length === 0) {
             this.logDebug('All pending slots have been deferred this session');
             return;
@@ -144,9 +317,24 @@ class CalendarScheduler {
             await this.deferSlot(slot);
             this.state.deferredSlotIds.add(this.getSlotId(slot));
         }
+        // Check if this is a ScheduledGatewayRestart event
+        if (this.isScheduledGatewayRestart(selectedSlot)) {
+            await this.handleScheduledGatewayRestart(selectedSlot);
+            return;
+        }
         // Wake agent to execute selected slot
         await this.executeSlot(selectedSlot);
     }
+    /**
+     * Check if a slot is a ScheduledGatewayRestart system event.
+     */
+    isScheduledGatewayRestart(slot) {
+        if (slot.event_type !== 'system_event' || !slot.event_data) {
+            return false;
+        }
+        const sysData = slot.event_data;
+        return sysData.event === 'ScheduledGatewayRestart';
+    }
     /**
      * Execute a slot by waking the agent.
      */
@@ -544,6 +732,18 @@ Please use this time for the scheduled activity.`;
     getCurrentSlot() {
         return this.state.currentSlot;
     }
+    /**
+     * Check if a gateway restart is pending.
+     */
+    isRestartPending() {
+        return this.state.isRestartPending;
+    }
+    /**
+     * Get the path to the state file.
+     */
+    getStateFilePath() {
+        return this.stateFilePath;
+    }
 }
 exports.CalendarScheduler = CalendarScheduler;
 /**
diff --git a/plugin/calendar/scheduler.js.map b/plugin/calendar/scheduler.js.map
index af5353a..de36aaf 100644
--- a/plugin/calendar/scheduler.js.map
+++ b/plugin/calendar/scheduler.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/plugin/calendar/scheduler.ts b/plugin/calendar/scheduler.ts
index 718b79e..bb0675f 100644
--- a/plugin/calendar/scheduler.ts
+++ b/plugin/calendar/scheduler.ts
@@ -2,6 +2,7 @@
  * HarborForge Calendar Scheduler
  *
  * PLG-CAL-002: Plugin-side handling for pending slot execution.
+ * PLG-CAL-004: ScheduledGatewayRestart event handling with state persistence.
  *
  * Responsibilities:
  *   - Run calendar heartbeat every minute
@@ -9,13 +10,15 @@
  *   - Wake agent with task context
  *   - Handle slot status transitions (attended, ongoing, deferred)
  *   - Manage agent status transitions (idle → busy/on_call)
+ *   - Persist state on ScheduledGatewayRestart and restore on startup
+ *   - Send final heartbeat before graceful shutdown
  *
  * Design reference: NEXT_WAVE_DEV_DIRECTION.md §6 (Agent wakeup mechanism)
  */
 
-import {
-  CalendarBridgeClient,
-} from './calendar-bridge';
+import { writeFileSync, readFileSync, existsSync, mkdirSync } from 'fs';
+import { join, dirname } from 'path';
+import { CalendarBridgeClient } from './calendar-bridge';
 import {
   CalendarSlotResponse,
   SlotStatus,
@@ -43,6 +46,8 @@ export interface CalendarSchedulerConfig {
   heartbeatIntervalMs?: number;
   /** Enable verbose debug logging */
   debug?: boolean;
+  /** Directory for state persistence (default: plugin data dir) */
+  stateDir?: string;
 }
 
 /**
@@ -60,6 +65,26 @@ export interface AgentWakeContext {
   isVirtual: boolean;
 }
 
+/**
+ * Persisted state structure for recovery after restart.
+ */
+interface PersistedState {
+  /** Version for migration compatibility */
+  version: number;
+  /** When the state was persisted */
+  persistedAt: string;
+  /** Reason for persistence (e.g., 'ScheduledGatewayRestart') */
+  reason: string;
+  /** The slot that was being executed when persisted */
+  currentSlot: CalendarSlotResponse | null;
+  /** Deferred slot IDs at persistence time */
+  deferredSlotIds: string[];
+  /** Whether a slot was in progress */
+  isProcessing: boolean;
+  /** Agent status at persistence time */
+  agentStatus: AgentStatusValue | null;
+}
+
 /**
  * Current execution state tracked by the scheduler.
  */
@@ -76,21 +101,33 @@ interface SchedulerState {
   deferredSlotIds: Set<string>;
   /** Whether agent is currently processing a slot */
   isProcessing: boolean;
+  /** Whether a gateway restart is scheduled/pending */
+  isRestartPending: boolean;
 }
 
+/** State file name */
+const STATE_FILENAME = 'calendar-scheduler-state.json';
+/** State file version for migration compatibility */
+const STATE_VERSION = 1;
+
 /**
  * CalendarScheduler manages the periodic heartbeat and slot execution lifecycle.
  */
 export class CalendarScheduler {
   private config: Required<CalendarSchedulerConfig>;
   private state: SchedulerState;
+  private stateFilePath: string;
 
   constructor(config: CalendarSchedulerConfig) {
     this.config = {
       heartbeatIntervalMs: 60000, // 1 minute default
       debug: false,
+      stateDir: this.getDefaultStateDir(),
       ...config,
     };
+
+    this.stateFilePath = join(this.config.stateDir, STATE_FILENAME);
+
     this.state = {
       isRunning: false,
       currentSlot: null,
@@ -98,7 +135,182 @@ export class CalendarScheduler {
       intervalHandle: null,
       deferredSlotIds: new Set(),
       isProcessing: false,
+      isRestartPending: false,
     };
+
+    // Attempt to restore state from previous persistence
+    this.restoreState();
+  }
+
+  /**
+   * Get default state directory (plugin data directory or temp fallback).
+   */
+  private getDefaultStateDir(): string {
+    // Try to use the plugin's directory or a standard data location
+    const candidates = [
+      process.env.OPENCLAW_PLUGIN_DATA_DIR,
+      process.env.HARBORFORGE_PLUGIN_DIR,
+      join(process.cwd(), '.harborforge'),
+      join(process.cwd(), 'data'),
+      '/tmp/harborforge',
+    ];
+
+    for (const dir of candidates) {
+      if (dir) {
+        try {
+          if (!existsSync(dir)) {
+            mkdirSync(dir, { recursive: true });
+          }
+          // Test write access
+          const testFile = join(dir, '.write-test');
+          writeFileSync(testFile, '', { flag: 'w' });
+          return dir;
+        } catch {
+          continue;
+        }
+      }
+    }
+
+    // Fallback to current working directory
+    return process.cwd();
+  }
+
+  /**
+   * Persist current state to disk for recovery after restart.
+   */
+  private persistState(reason: string): void {
+    try {
+      const persistedState: PersistedState = {
+        version: STATE_VERSION,
+        persistedAt: new Date().toISOString(),
+        reason,
+        currentSlot: this.state.currentSlot,
+        deferredSlotIds: Array.from(this.state.deferredSlotIds),
+        isProcessing: this.state.isProcessing,
+        agentStatus: null, // Will be determined at restore time
+      };
+
+      writeFileSync(this.stateFilePath, JSON.stringify(persistedState, null, 2));
+      this.config.logger.info(`[PLG-CAL-004] State persisted to ${this.stateFilePath} (reason: ${reason})`);
+    } catch (err) {
+      this.config.logger.error('[PLG-CAL-004] Failed to persist state:', err);
+    }
+  }
+
+  /**
+   * Restore state from disk if available.
+   */
+  private restoreState(): void {
+    try {
+      if (!existsSync(this.stateFilePath)) {
+        return;
+      }
+
+      const data = readFileSync(this.stateFilePath, 'utf-8');
+      const persisted: PersistedState = JSON.parse(data);
+
+      // Validate version
+      if (persisted.version !== STATE_VERSION) {
+        this.config.logger.warn(`[PLG-CAL-004] State version mismatch: ${persisted.version} vs ${STATE_VERSION}`);
+        this.clearPersistedState();
+        return;
+      }
+
+      // Restore deferred slot IDs
+      if (persisted.deferredSlotIds && persisted.deferredSlotIds.length > 0) {
+        this.state.deferredSlotIds = new Set(persisted.deferredSlotIds);
+        this.config.logger.info(`[PLG-CAL-004] Restored ${persisted.deferredSlotIds.length} deferred slot(s)`);
+      }
+
+      // If there was a slot in progress, mark it for replanning
+      if (persisted.isProcessing && persisted.currentSlot) {
+        this.config.logger.warn(
+          `[PLG-CAL-004] Previous session had in-progress slot: ${this.getSlotId(persisted.currentSlot)}`
+        );
+        // The slot will be picked up by the next heartbeat and can be resumed or deferred
+      }
+
+      this.config.logger.info(`[PLG-CAL-004] State restored from ${persisted.persistedAt} (reason: ${persisted.reason})`);
+
+      // Clear the persisted state after successful restore
+      this.clearPersistedState();
+    } catch (err) {
+      this.config.logger.error('[PLG-CAL-004] Failed to restore state:', err);
+    }
+  }
+
+  /**
+   * Clear persisted state file after successful restore.
+   */
+  private clearPersistedState(): void {
+    try {
+      if (existsSync(this.stateFilePath)) {
+        // In a real implementation, we might want to archive instead of delete
+        // For now, we'll just clear the content to mark as processed
+        writeFileSync(this.stateFilePath, JSON.stringify({ restored: true, at: new Date().toISOString() }));
+      }
+    } catch (err) {
+      this.config.logger.error('[PLG-CAL-004] Failed to clear persisted state:', err);
+    }
+  }
+
+  /**
+   * Send a final heartbeat to the backend before shutdown.
+   */
+  private async sendFinalHeartbeat(reason: string): Promise<void> {
+    try {
+      this.config.logger.info(`[PLG-CAL-004] Sending final heartbeat (reason: ${reason})`);
+
+      // Send agent status update indicating we're going offline
+      await this.config.bridge.reportAgentStatus({ status: 'offline' });
+
+      this.config.logger.info('[PLG-CAL-004] Final heartbeat sent successfully');
+    } catch (err) {
+      this.config.logger.error('[PLG-CAL-004] Failed to send final heartbeat:', err);
+    }
+  }
+
+  /**
+   * Handle ScheduledGatewayRestart event.
+   * PLG-CAL-004: Persist state, send final heartbeat, pause scheduled tasks.
+   */
+  private async handleScheduledGatewayRestart(slot: CalendarSlotResponse): Promise<void> {
+    this.config.logger.info('[PLG-CAL-004] Handling ScheduledGatewayRestart event');
+
+    // 1. Mark restart as pending to prevent new slot processing
+    this.state.isRestartPending = true;
+
+    // 2. Persist current state
+    this.persistState('ScheduledGatewayRestart');
+
+    // 3. If there's a current slot, pause it gracefully
+    if (this.state.isProcessing && this.state.currentSlot) {
+      this.config.logger.info('[PLG-CAL-004] Pausing current slot before restart');
+      await this.pauseCurrentSlot();
+    }
+
+    // 4. Send final heartbeat
+    await this.sendFinalHeartbeat('ScheduledGatewayRestart');
+
+    // 5. Stop the scheduler (pause scheduled tasks)
+    this.config.logger.info('[PLG-CAL-004] Stopping scheduler due to gateway restart');
+    this.stop();
+
+    // 6. Mark the slot as finished (since we've handled the restart)
+    const update: SlotAgentUpdate = {
+      status: SlotStatus.FINISHED,
+      actual_duration: 0, // Restart preparation doesn't take time
+    };
+
+    try {
+      if (slot.id) {
+        await this.config.bridge.updateSlot(slot.id, update);
+      } else if (slot.virtual_id) {
+        await this.config.bridge.updateVirtualSlot(slot.virtual_id, update);
+      }
+    } catch (err) {
+      this.config.logger.error('[PLG-CAL-004] Failed to mark restart slot as finished:', err);
+    }
   }
 
   /**
@@ -112,6 +324,7 @@ export class CalendarScheduler {
     }
 
     this.state.isRunning = true;
+    this.state.isRestartPending = false;
     this.config.logger.info('Calendar scheduler started');
 
     // Run initial heartbeat immediately
@@ -148,6 +361,12 @@ export class CalendarScheduler {
       return;
     }
 
+    // Skip heartbeat if restart is pending
+    if (this.state.isRestartPending) {
+      this.logDebug('Heartbeat skipped: gateway restart pending');
+      return;
+    }
+
     this.state.lastHeartbeatAt = new Date();
 
     try {
@@ -159,7 +378,9 @@ export class CalendarScheduler {
         return;
       }
 
-      this.logDebug(`Heartbeat: ${response.slots.length} slots pending, agent_status=${response.agent_status}`);
+      this.logDebug(
+        `Heartbeat: ${response.slots.length} slots pending, agent_status=${response.agent_status}`
+      );
 
       // If agent is not idle, defer all pending slots
       if (response.agent_status !== 'idle') {
@@ -178,7 +399,6 @@ export class CalendarScheduler {
 
       // Agent is idle - handle pending slots
       await this.handleIdleAgent(response.slots);
-
     } catch (err) {
       this.config.logger.error('Heartbeat error:', err);
     }
@@ -225,7 +445,7 @@ export class CalendarScheduler {
 
     // Filter out already deferred slots in this session
     const eligibleSlots = slots.filter(
-      s => !this.state.deferredSlotIds.has(this.getSlotId(s))
+      (s) => !this.state.deferredSlotIds.has(this.getSlotId(s))
     );
 
     if (eligibleSlots.length === 0) {
@@ -238,7 +458,7 @@ export class CalendarScheduler {
 
     this.config.logger.info(
       `Selected slot for execution: id=${this.getSlotId(selectedSlot)}, ` +
-      `type=${selectedSlot.slot_type}, priority=${selectedSlot.priority}`
+        `type=${selectedSlot.slot_type}, priority=${selectedSlot.priority}`
     );
 
     // Mark remaining slots as deferred
@@ -247,10 +467,27 @@ export class CalendarScheduler {
       this.state.deferredSlotIds.add(this.getSlotId(slot));
     }
 
+    // Check if this is a ScheduledGatewayRestart event
+    if (this.isScheduledGatewayRestart(selectedSlot)) {
+      await this.handleScheduledGatewayRestart(selectedSlot);
+      return;
+    }
+
     // Wake agent to execute selected slot
     await this.executeSlot(selectedSlot);
   }
 
+  /**
+   * Check if a slot is a ScheduledGatewayRestart system event.
+   */
+  private isScheduledGatewayRestart(slot: CalendarSlotResponse): boolean {
+    if (slot.event_type !== 'system_event' || !slot.event_data) {
+      return false;
+    }
+    const sysData = slot.event_data as CalendarEventDataSystemEvent;
+    return sysData.event === 'ScheduledGatewayRestart';
+  }
+
   /**
    * Execute a slot by waking the agent.
    */
@@ -315,7 +552,6 @@ export class CalendarScheduler {
 
       // Note: isProcessing remains true until agent signals completion
       // This is handled by external completion callback
-
     } catch (err) {
       this.config.logger.error('Error executing slot:', err);
       this.state.isProcessing = false;
@@ -361,7 +597,10 @@ export class CalendarScheduler {
   /**
    * Build prompt for job-type slots.
    */
-  private buildJobPrompt(slot: CalendarSlotResponse, jobData: CalendarEventDataJob): string {
+  private buildJobPrompt(
+    slot: CalendarSlotResponse,
+    jobData: CalendarEventDataJob
+  ): string {
     const duration = slot.estimated_duration;
     const type = jobData.type;
     const code = jobData.code;
@@ -518,7 +757,6 @@ Please use this time for the scheduled activity.`;
       this.config.logger.info(
         `Completed slot ${this.getSlotId(slot)}, actual_duration=${actualDurationMinutes}min`
       );
-
     } catch (err) {
       this.config.logger.error('Failed to complete slot:', err);
     } finally {
@@ -556,7 +794,6 @@ Please use this time for the scheduled activity.`;
       this.config.logger.info(
         `Aborted slot ${this.getSlotId(slot)}${reason ? `: ${reason}` : ''}`
       );
-
     } catch (err) {
       this.config.logger.error('Failed to abort slot:', err);
     } finally {
@@ -589,7 +826,6 @@ Please use this time for the scheduled activity.`;
       }
 
       this.config.logger.info(`Paused slot ${this.getSlotId(slot)}`);
-
     } catch (err) {
       this.config.logger.error('Failed to pause slot:', err);
     }
@@ -617,7 +853,6 @@ Please use this time for the scheduled activity.`;
       }
 
       this.config.logger.info(`Resumed slot ${this.getSlotId(slot)}`);
-
     } catch (err) {
       this.config.logger.error('Failed to resume slot:', err);
     }
@@ -692,6 +927,20 @@ Please use this time for the scheduled activity.`;
   getCurrentSlot(): CalendarSlotResponse | null {
     return this.state.currentSlot;
   }
+
+  /**
+   * Check if a gateway restart is pending.
+   */
+  isRestartPending(): boolean {
+    return this.state.isRestartPending;
+  }
+
+  /**
+   * Get the path to the state file.
+   */
+  getStateFilePath(): string {
+    return this.stateFilePath;
+  }
 }
 
 /**
diff --git a/plugin/index.ts b/plugin/index.ts
index 19a1b33..0e50d97 100644
--- a/plugin/index.ts
+++ b/plugin/index.ts
@@ -5,7 +5,7 @@
  * for the HarborForge Monitor bridge (via monitor_port).
  *
  * Also integrates with HarborForge Calendar system to wake agents
- * for scheduled tasks (PLG-CAL-002).
+ * for scheduled tasks (PLG-CAL-002, PLG-CAL-004).
  *
  * Sidecar architecture has been removed. Telemetry data is now
  * served directly by the plugin when Monitor queries via the
@@ -105,7 +105,7 @@ export default {
         },
         openclaw: {
           version: api.version || 'unknown',
-          pluginVersion: '0.3.0',
+          pluginVersion: '0.3.1', // Bumped for PLG-CAL-004
         },
         timestamp: new Date().toISOString(),
       };
@@ -128,7 +128,7 @@ export default {
 
       const meta: OpenClawMeta = {
         version: api.version || 'unknown',
-        plugin_version: '0.3.0',
+        plugin_version: '0.3.1',
         agents: [], // TODO: populate from api agent list when available
       };
 
@@ -363,6 +363,7 @@ export default {
           running: calendarScheduler.isRunning(),
           processing: calendarScheduler.isProcessing(),
           currentSlot: calendarScheduler.getCurrentSlot(),
+          isRestartPending: calendarScheduler.isRestartPending(),
         } : null;
 
         return {
@@ -439,6 +440,8 @@ export default {
           processing: calendarScheduler.isProcessing(),
           currentSlot: calendarScheduler.getCurrentSlot(),
           state: calendarScheduler.getState(),
+          isRestartPending: calendarScheduler.isRestartPending(),
+          stateFilePath: calendarScheduler.getStateFilePath(),
         };
       },
     }));
@@ -490,6 +493,68 @@ export default {
       },
     }));
 
+    // Tool: pause current slot
+    api.registerTool(() => ({
+      name: 'harborforge_calendar_pause',
+      description: 'Pause the current calendar slot',
+      parameters: {
+        type: 'object',
+        properties: {},
+      },
+      async execute() {
+        if (!calendarScheduler) {
+          return { error: 'Calendar scheduler not running' };
+        }
+
+        await calendarScheduler.pauseCurrentSlot();
+        return { success: true, message: 'Slot paused' };
+      },
+    }));
+
+    // Tool: resume current slot
+    api.registerTool(() => ({
+      name: 'harborforge_calendar_resume',
+      description: 'Resume the paused calendar slot',
+      parameters: {
+        type: 'object',
+        properties: {},
+      },
+      async execute() {
+        if (!calendarScheduler) {
+          return { error: 'Calendar scheduler not running' };
+        }
+
+        await calendarScheduler.resumeCurrentSlot();
+        return { success: true, message: 'Slot resumed' };
+      },
+    }));
+
+    // Tool: check ScheduledGatewayRestart status
+    api.registerTool(() => ({
+      name: 'harborforge_restart_status',
+      description: 'Check if a gateway restart is pending (PLG-CAL-004)',
+      parameters: {
+        type: 'object',
+        properties: {},
+      },
+      async execute() {
+        if (!calendarScheduler) {
+          return { error: 'Calendar scheduler not running' };
+        }
+
+        const isPending = calendarScheduler.isRestartPending();
+        const stateFilePath = calendarScheduler.getStateFilePath();
+
+        return {
+          isRestartPending: isPending,
+          stateFilePath: stateFilePath,
+          message: isPending
+            ? 'A gateway restart has been scheduled. The scheduler has been paused.'
+            : 'No gateway restart is pending.',
+        };
+      },
+    }));
+
     logger.info('HarborForge plugin registered (id: harbor-forge)');
   },
 };