diff --git a/REFACTOR_PLAN.md b/REFACTOR_PLAN.md
new file mode 100644
index 0000000..1b2f63c
--- /dev/null
+++ b/REFACTOR_PLAN.md
@@ -0,0 +1,112 @@
+# CalendarScheduler Refactor Plan
+
+## Current Design
+
+```
+Every 60s:
+  heartbeat() → POST /calendar/agent/heartbeat → returns pending slots
+  if idle → select highest priority → executeSlot → wakeAgent(spawn)
+  if busy → defer all pending slots
+```
+
+**Problems:**
+1. Every heartbeat queries backend for pending slots — no local awareness of full schedule
+2. Cannot detect slots assigned by other agents between heartbeats
+3. 60s interval is too frequent for sync but too infrequent for precise wakeup
+4. Wakeup via `api.spawn()` creates a plain session, not a Discord private channel
+
+## Target Design
+
+```
+Every 5-10 min (sync interval):
+  syncSchedule() → GET /calendar/day → update local today cache
+
+Every 30s (check interval):
+  checkDueSlots() → scan local cache for due slots
+  if due slot found:
+    confirmAgentStatus() → GET /calendar/agent/status
+    if not busy → wakeAgent (via Dirigent moderator bot private channel)
+```
+
+## Changes Required
+
+### 1. Add Local Schedule Cache
+
+New class `ScheduleCache`:
+```typescript
+class ScheduleCache {
+  private slots: Map<string, CalendarSlotResponse>;  // slotId → slot
+  private lastSyncAt: Date | null;
+
+  async sync(bridge: CalendarBridgeClient): Promise<void>;  // fetch today's full schedule
+  getDueSlots(now: Date): CalendarSlotResponse[];  // scheduled_at <= now && NOT_STARTED/DEFERRED
+  updateSlot(id: string, update: Partial<CalendarSlotResponse>): void;  // local update
+  getAll(): CalendarSlotResponse[];
+}
+```
+
+### 2. Add CalendarBridgeClient.getDaySchedule()
+
+New endpoint call:
+```typescript
+async getDaySchedule(date: string): Promise<CalendarSlotResponse[]>
+// GET /calendar/day?date=YYYY-MM-DD
+```
+
+This fetches ALL slots for the day, not just pending ones. The existing `heartbeat()` only returns NOT_STARTED/DEFERRED.
+
+### 3. Split Heartbeat into Sync + Check
+
+**Replace** single `runHeartbeat()` with two intervals:
+
+```typescript
+// Sync: every 5 min — pull full schedule from backend
+this.syncInterval = setInterval(() => this.runSync(), 300_000);
+
+// Check: every 30s — scan local cache for due slots
+this.checkInterval = setInterval(() => this.runCheck(), 30_000);
+```
+
+`runSync()`:
+1. `bridge.getDaySchedule(today)` → update cache
+2. Still send heartbeat to keep backend informed of agent liveness
+
+`runCheck()`:
+1. `cache.getDueSlots(now)` → find due slots
+2. Filter out session-deferred slots
+3. If agent idle → select highest priority → execute
+
+### 4. Wakeup via Dirigent (future)
+
+Change `wakeAgent()` to create a private Discord channel via Dirigent moderator bot instead of `api.spawn()`. This requires:
+- Access to Dirigent's moderator bot token or cross-plugin API
+- Creating a private channel with only the target agent
+- Posting the wakeup prompt as a message
+
+**For now:** Keep `api.spawn()` as the wakeup method. The Dirigent integration can be added later as it requires cross-plugin coordination.
+
+## Implementation Order
+
+1. Add `ScheduleCache` class (new file: `plugin/calendar/schedule-cache.ts`)
+2. Add `getDaySchedule()` to `CalendarBridgeClient`
+3. Refactor `CalendarScheduler`:
+   - Replace single interval with sync + check intervals
+   - Use cache instead of heartbeat for slot discovery
+   - Keep heartbeat for agent liveness reporting (reduced frequency)
+4. Update state persistence for new structure
+5. Keep existing wakeAgent/completion/abort/pause/resume tools unchanged
+
+## Files to Modify
+
+| File | Changes |
+|------|---------|
+| `plugin/calendar/schedule-cache.ts` | New file |
+| `plugin/calendar/calendar-bridge.ts` | Add `getDaySchedule()` |
+| `plugin/calendar/scheduler.ts` | Refactor heartbeat → sync + check |
+| `plugin/calendar/index.ts` | Export new types |
+
+## Risk Assessment
+
+- **Low risk:** ScheduleCache is additive, doesn't break existing behavior
+- **Medium risk:** Splitting heartbeat changes core scheduling logic
+- **Mitigation:** Keep `heartbeat()` method intact, use it for liveness reporting alongside new sync
diff --git a/plugin/calendar/calendar-bridge.ts b/plugin/calendar/calendar-bridge.ts
index dca5cf5..4b92c27 100644
--- a/plugin/calendar/calendar-bridge.ts
+++ b/plugin/calendar/calendar-bridge.ts
@@ -169,6 +169,32 @@ export class CalendarBridgeClient {
     return this.sendBoolean('POST', url, body);
   }
 
+  /**
+   * Fetch the full day schedule for this agent.
+   *
+   * Unlike heartbeat() which only returns pending (NOT_STARTED/DEFERRED) slots,
+   * this returns ALL slots for the given date, enabling the plugin to maintain
+   * a complete local view of today's schedule.
+   *
+   * @param date  Date string in YYYY-MM-DD format
+   * @returns Array of all slots for the day, or null if unreachable
+   */
+  async getDaySchedule(date: string): Promise<CalendarSlotResponse[] | null> {
+    const url = `${this.baseUrl}/calendar/day?date=${encodeURIComponent(date)}`;
+    try {
+      const response = await this.fetchJson<{ slots: CalendarSlotResponse[] }>(url, {
+        method: 'GET',
+        headers: {
+          'X-Agent-ID': this.config.agentId,
+          'X-Claw-Identifier': this.config.clawIdentifier,
+        },
+      });
+      return response?.slots ?? null;
+    } catch {
+      return null;
+    }
+  }
+
   // -------------------------------------------------------------------------
   // Internal helpers
   // -------------------------------------------------------------------------
diff --git a/plugin/calendar/index.ts b/plugin/calendar/index.ts
index 8d2bed7..a829ccf 100644
--- a/plugin/calendar/index.ts
+++ b/plugin/calendar/index.ts
@@ -31,3 +31,4 @@
 export * from './types';
 export * from './calendar-bridge';
 export * from './scheduler';
+export * from './schedule-cache';
diff --git a/plugin/calendar/schedule-cache.ts b/plugin/calendar/schedule-cache.ts
new file mode 100644
index 0000000..9f8bfe6
--- /dev/null
+++ b/plugin/calendar/schedule-cache.ts
@@ -0,0 +1,109 @@
+/**
+ * Local cache of today's calendar schedule.
+ * Synced periodically from HF backend, checked locally for due slots.
+ */
+
+import type { CalendarSlotResponse } from "./types.js";
+
+export class ScheduleCache {
+  private slots: Map<string, CalendarSlotResponse> = new Map();
+  private lastSyncAt: Date | null = null;
+  private cachedDate: string | null = null; // YYYY-MM-DD
+
+  /**
+   * Replace the cache with a fresh schedule from backend.
+   */
+  sync(date: string, slots: CalendarSlotResponse[]): void {
+    // If date changed, clear old data
+    if (this.cachedDate !== date) {
+      this.slots.clear();
+    }
+    this.cachedDate = date;
+
+    // Merge: update existing slots, add new ones
+    const incomingIds = new Set<string>();
+    for (const slot of slots) {
+      const id = this.getSlotId(slot);
+      incomingIds.add(id);
+      this.slots.set(id, slot);
+    }
+
+    // Remove slots that no longer exist on backend (cancelled etc.)
+    for (const id of this.slots.keys()) {
+      if (!incomingIds.has(id)) {
+        this.slots.delete(id);
+      }
+    }
+
+    this.lastSyncAt = new Date();
+  }
+
+  /**
+   * Get slots that are due (scheduled_at <= now) and still pending.
+   */
+  getDueSlots(now: Date): CalendarSlotResponse[] {
+    const results: CalendarSlotResponse[] = [];
+    for (const slot of this.slots.values()) {
+      if (slot.status !== "not_started" && slot.status !== "deferred") continue;
+      if (!slot.scheduled_at) continue;
+
+      const scheduledAt = this.parseScheduledTime(slot.scheduled_at);
+      if (scheduledAt && scheduledAt <= now) {
+        results.push(slot);
+      }
+    }
+    // Sort by priority descending
+    results.sort((a, b) => (b.priority ?? 0) - (a.priority ?? 0));
+    return results;
+  }
+
+  /**
+   * Update a slot locally (e.g., after status change).
+   */
+  updateSlot(slotId: string, update: Partial<CalendarSlotResponse>): void {
+    const existing = this.slots.get(slotId);
+    if (existing) {
+      this.slots.set(slotId, { ...existing, ...update });
+    }
+  }
+
+  /**
+   * Remove a slot from cache.
+   */
+  removeSlot(slotId: string): void {
+    this.slots.delete(slotId);
+  }
+
+  /**
+   * Get all cached slots.
+   */
+  getAll(): CalendarSlotResponse[] {
+    return Array.from(this.slots.values());
+  }
+
+  /**
+   * Get cache metadata.
+   */
+  getStatus(): { slotCount: number; lastSyncAt: string | null; cachedDate: string | null } {
+    return {
+      slotCount: this.slots.size,
+      lastSyncAt: this.lastSyncAt?.toISOString() ?? null,
+      cachedDate: this.cachedDate,
+    };
+  }
+
+  private getSlotId(slot: CalendarSlotResponse): string {
+    return slot.virtual_id ?? String(slot.id);
+  }
+
+  private parseScheduledTime(scheduledAt: string): Date | null {
+    // scheduled_at can be "HH:MM:SS" (time only) or full ISO
+    if (/^\d{2}:\d{2}(:\d{2})?$/.test(scheduledAt)) {
+      // Time-only: combine with cached date
+      if (!this.cachedDate) return null;
+      return new Date(`${this.cachedDate}T${scheduledAt}Z`);
+    }
+    const d = new Date(scheduledAt);
+    return isNaN(d.getTime()) ? null : d;
+  }
+}
diff --git a/plugin/calendar/scheduler.ts b/plugin/calendar/scheduler.ts
index b93978c..e77f5de 100644
--- a/plugin/calendar/scheduler.ts
+++ b/plugin/calendar/scheduler.ts
@@ -19,6 +19,7 @@
 import { writeFileSync, readFileSync, existsSync, mkdirSync } from 'fs';
 import { join, dirname } from 'path';
 import { CalendarBridgeClient } from './calendar-bridge';
+import { ScheduleCache } from './schedule-cache';
 import {
   CalendarSlotResponse,
   SlotStatus,
@@ -44,6 +45,8 @@ export interface CalendarSchedulerConfig {
   };
   /** Heartbeat interval in milliseconds (default: 60000) */
   heartbeatIntervalMs?: number;
+  /** Schedule sync interval in milliseconds (default: 300000 = 5 min) */
+  syncIntervalMs?: number;
   /** Enable verbose debug logging */
   debug?: boolean;
   /** Directory for state persistence (default: plugin data dir) */
@@ -95,8 +98,10 @@ interface SchedulerState {
   currentSlot: CalendarSlotResponse | null;
   /** Last heartbeat timestamp */
   lastHeartbeatAt: Date | null;
-  /** Interval handle for cleanup */
+  /** Heartbeat interval handle */
   intervalHandle: ReturnType<typeof setInterval> | null;
+  /** Schedule sync interval handle */
+  syncIntervalHandle: ReturnType<typeof setInterval> | null;
   /** Set of slot IDs that have been deferred in current session */
   deferredSlotIds: Set<string>;
   /** Whether agent is currently processing a slot */
@@ -117,10 +122,13 @@ export class CalendarScheduler {
   private config: Required<CalendarSchedulerConfig>;
   private state: SchedulerState;
   private stateFilePath: string;
+  /** Local cache of today's full schedule, synced periodically from backend */
+  private scheduleCache: ScheduleCache = new ScheduleCache();
 
   constructor(config: CalendarSchedulerConfig) {
     this.config = {
       heartbeatIntervalMs: 60000, // 1 minute default
+      syncIntervalMs: 300_000,    // 5 minutes default
       debug: false,
       stateDir: this.getDefaultStateDir(),
       ...config,
@@ -133,6 +141,7 @@ export class CalendarScheduler {
       currentSlot: null,
       lastHeartbeatAt: null,
       intervalHandle: null,
+      syncIntervalHandle: null,
       deferredSlotIds: new Set(),
       isProcessing: false,
       isRestartPending: false,
@@ -327,14 +336,21 @@ export class CalendarScheduler {
     this.state.isRestartPending = false;
     this.config.logger.info('Calendar scheduler started');
 
-    // Run initial heartbeat immediately
+    // Run initial sync + heartbeat immediately
+    this.runSync();
     this.runHeartbeat();
 
-    // Schedule periodic heartbeats
+    // Schedule periodic heartbeats (slot execution checks)
     this.state.intervalHandle = setInterval(
       () => this.runHeartbeat(),
       this.config.heartbeatIntervalMs
     );
+
+    // Schedule periodic schedule sync (full day schedule refresh)
+    this.state.syncIntervalHandle = setInterval(
+      () => this.runSync(),
+      this.config.syncIntervalMs
+    );
   }
 
   /**
@@ -348,10 +364,41 @@ export class CalendarScheduler {
       clearInterval(this.state.intervalHandle);
       this.state.intervalHandle = null;
     }
+    if (this.state.syncIntervalHandle) {
+      clearInterval(this.state.syncIntervalHandle);
+      this.state.syncIntervalHandle = null;
+    }
 
     this.config.logger.info('Calendar scheduler stopped');
   }
 
+  /**
+   * Sync today's full schedule from backend into local cache.
+   * Runs every syncIntervalMs (default: 5 min).
+   * Catches new slots assigned by other agents or the manager.
+   */
+  async runSync(): Promise<void> {
+    if (!this.state.isRunning || this.state.isRestartPending) return;
+
+    const today = new Date().toISOString().slice(0, 10);
+    try {
+      const slots = await this.config.bridge.getDaySchedule(today);
+      if (slots) {
+        this.scheduleCache.sync(today, slots);
+        this.logDebug(`Schedule synced: ${slots.length} slots for ${today}`);
+      }
+    } catch (err) {
+      this.config.logger.warn(`Schedule sync failed: ${String(err)}`);
+    }
+  }
+
+  /**
+   * Get the local schedule cache (for status reporting / tools).
+   */
+  getScheduleCache(): ScheduleCache {
+    return this.scheduleCache;
+  }
+
   /**
    * Execute a single heartbeat cycle.
    * Fetches pending slots and handles execution logic.