diff --git a/README.md b/README.md
index aaf3240..84e3d40 100644
--- a/README.md
+++ b/README.md
@@ -1190,7 +1190,7 @@ Methods:
 - `system.capabilities` returns gateway protocol and node policy snapshot.
 
 Companion runtime helper:
-- `src/companion/runtimeClient.ts` provides a typed Node/WebSocket client for companion runtimes (macOS/iOS/Android workers) with wrappers for `node.register`, `node.capabilities.get`, `node.location.set/get`, `node.status.set`, `node.push_token.set`, `system.capabilities`, `system.nodes`, and canvas artifact RPCs (`canvas.put/get/list/delete/clear`), plus convenience helpers (`bootstrapNode`, optional `autoConnect`, `dispose()`, `waitForIdle()` for pending-work drain synchronization) and event helpers (`subscribeEvents()`, `subscribeEvent()`, `subscribeAgentStream()`, `subscribeAgentTyping()`, `subscribeContextWarning()`, `waitForEvent()` with timeout/predicate/abort support plus event-name/timeout validation and deterministic teardown cancellation including socket-close rejection, `waitForAnyEvent()` with event-list/timeout validation, `waitForAgentStream()`, `waitForAgentTyping()`, `waitForContextWarning()`, `clearEventSubscriptions()`, `cancelPendingEventWaits()`, `listKnownEventNames()`, `eventSubscriptionCount`) plus in-flight observability via `pendingRequestCount`, `pendingEventWaitCount`, `hasPendingWork`, `idle`, and `getPendingWorkSnapshot()`.
+- `src/companion/runtimeClient.ts` provides a typed Node/WebSocket client for companion runtimes (macOS/iOS/Android workers) with wrappers for `node.register`, `node.capabilities.get`, `node.location.set/get`, `node.status.set`, `node.push_token.set`, `system.capabilities`, `system.nodes`, and canvas artifact RPCs (`canvas.put/get/list/delete/clear`), plus convenience helpers (`bootstrapNode`, optional `autoConnect`, `dispose()`, `waitForIdle()` for pending-work drain synchronization) and event helpers (`subscribeEvents()`, `subscribeEvent()`, `subscribeAgentStream()`, `subscribeAgentTyping()`, `subscribeContextWarning()`, `waitForEvent()` with timeout/predicate/abort support plus event-name/timeout validation and deterministic teardown cancellation including socket-close rejection, `waitForAnyEvent()` with event-list/timeout validation, `waitForAgentStream()`, `waitForAgentTyping()`, `waitForContextWarning()`, `clearEventSubscriptions()`, `cancelPendingEventWaits()` returning cancelled waiter count, `listKnownEventNames()`, `eventSubscriptionCount`) plus in-flight observability via `pendingRequestCount`, `pendingEventWaitCount`, `hasPendingWork`, `idle`, and `getPendingWorkSnapshot()`.
 - `src/companion/platformClients.ts` provides platform-focused wrappers:
   - `MacOSCompanionClient` (`platform: "macos"`, APNs push registration)
   - `IOSCompanionClient` (`platform: "ios"`, APNs push registration)
diff --git a/docs/plans/state.json b/docs/plans/state.json
index 62526ec..a133f37 100644
--- a/docs/plans/state.json
+++ b/docs/plans/state.json
@@ -1066,6 +1066,21 @@
       ],
       "test_status": "pnpm test:run src/companion/platformClients.integration.test.ts src/companion/platformClients.test.ts src/companion/runtimeClient.test.ts src/companion/heartbeatLoop.test.ts + pnpm typecheck passing"
     },
+    "companion-cancel-pending-waits-count-return": {
+      "status": "completed",
+      "date": "2026-02-17",
+      "updated": "2026-02-17",
+      "summary": "Extended `cancelPendingEventWaits()` to return cancelled waiter count on runtime and platform wrappers for explicit cancellation observability.",
+      "files_modified": [
+        "src/companion/runtimeClient.ts",
+        "src/companion/runtimeClient.test.ts",
+        "src/companion/platformClients.ts",
+        "src/companion/platformClients.test.ts",
+        "README.md",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/companion/runtimeClient.test.ts src/companion/platformClients.test.ts src/companion/heartbeatLoop.test.ts src/companion/platformClients.integration.test.ts + pnpm typecheck passing"
+    },
     "browser-tools-activation-clarity": {
       "status": "completed",
       "date": "2026-02-17",
diff --git a/src/companion/platformClients.test.ts b/src/companion/platformClients.test.ts
index 2b3a459..dc17b95 100644
--- a/src/companion/platformClients.test.ts
+++ b/src/companion/platformClients.test.ts
@@ -77,7 +77,7 @@ function createRuntimeMock(): {
   const subscribeEvents = vi.fn(() => () => undefined);
   const subscribeEvent = vi.fn(() => () => undefined);
   const clearEventSubscriptions = vi.fn(() => undefined);
-  const cancelPendingEventWaits = vi.fn(() => undefined);
+  const cancelPendingEventWaits = vi.fn(() => 1);
   const listKnownEventNames = vi.fn(() => ['agent.stream', 'agent.typing', 'context_warning']);
   const waitForEvent = vi.fn(async () => ({ token: 'evented' }));
   const waitForIdle = vi.fn(async () => undefined);
@@ -321,9 +321,10 @@ describe('platform companion clients', () => {
     const mock = createRuntimeMock();
     const client = new IOSCompanionClient({ runtime: mock.runtime, nodeId: 'ios-node' });
 
-    client.cancelPendingEventWaits('manual');
+    const cancelled = client.cancelPendingEventWaits('manual');
 
     expect(mock.cancelPendingEventWaits).toHaveBeenCalledWith('manual');
+    expect(cancelled).toBe(1);
   });
 
   it('platform listKnownEventNames forwards to runtime client', async () => {
diff --git a/src/companion/platformClients.ts b/src/companion/platformClients.ts
index ecb4e7a..a9e04e2 100644
--- a/src/companion/platformClients.ts
+++ b/src/companion/platformClients.ts
@@ -269,8 +269,8 @@ export class MacOSCompanionClient {
     this.runtime.clearEventSubscriptions();
   }
 
-  cancelPendingEventWaits(reason?: string): void {
-    this.runtime.cancelPendingEventWaits(reason);
+  cancelPendingEventWaits(reason?: string): number {
+    return this.runtime.cancelPendingEventWaits(reason);
   }
 
   listKnownEventNames(): CompanionEventName[] {
@@ -539,8 +539,8 @@ export class IOSCompanionClient {
     this.runtime.clearEventSubscriptions();
   }
 
-  cancelPendingEventWaits(reason?: string): void {
-    this.runtime.cancelPendingEventWaits(reason);
+  cancelPendingEventWaits(reason?: string): number {
+    return this.runtime.cancelPendingEventWaits(reason);
   }
 
   listKnownEventNames(): CompanionEventName[] {
@@ -807,8 +807,8 @@ export class AndroidCompanionClient {
     this.runtime.clearEventSubscriptions();
   }
 
-  cancelPendingEventWaits(reason?: string): void {
-    this.runtime.cancelPendingEventWaits(reason);
+  cancelPendingEventWaits(reason?: string): number {
+    return this.runtime.cancelPendingEventWaits(reason);
   }
 
   listKnownEventNames(): CompanionEventName[] {
diff --git a/src/companion/runtimeClient.test.ts b/src/companion/runtimeClient.test.ts
index 47a8095..79cddb7 100644
--- a/src/companion/runtimeClient.test.ts
+++ b/src/companion/runtimeClient.test.ts
@@ -399,7 +399,7 @@ describe('CompanionRuntimeClient', () => {
     const awaited = expect(
       client.waitForEvent('agent.stream', { timeoutMs: 10_000 }),
     ).rejects.toThrow('manually cancelled');
-    client.cancelPendingEventWaits('manually cancelled');
+    expect(client.cancelPendingEventWaits('manually cancelled')).toBe(1);
     await awaited;
 
     (client as unknown as { handleMessage: (raw: string) => void }).handleMessage(
@@ -410,6 +410,7 @@ describe('CompanionRuntimeClient', () => {
       }),
     );
     expect(handler).toHaveBeenCalledWith('agent.stream', { token: 'still-subscribed' });
+    expect(client.cancelPendingEventWaits()).toBe(0);
   });
 
   it('waitForEvent rejects immediately on disconnect', async () => {
diff --git a/src/companion/runtimeClient.ts b/src/companion/runtimeClient.ts
index e3fa849..5a4faee 100644
--- a/src/companion/runtimeClient.ts
+++ b/src/companion/runtimeClient.ts
@@ -435,8 +435,8 @@ export class CompanionRuntimeClient {
     this.rejectEventWaits(new Error('Event subscriptions cleared'));
   }
 
-  cancelPendingEventWaits(reason = 'Event waits cancelled'): void {
-    this.rejectEventWaits(new Error(reason));
+  cancelPendingEventWaits(reason = 'Event waits cancelled'): number {
+    return this.rejectEventWaits(new Error(reason));
   }
 
   subscribeEvent<TData = unknown>(
@@ -925,11 +925,13 @@ export class CompanionRuntimeClient {
     this.pending.clear();
   }
 
-  private rejectEventWaits(error: Error): void {
+  private rejectEventWaits(error: Error): number {
+    const cancelled = this.pendingEventWaits.size;
     for (const cancel of this.pendingEventWaits) {
       cancel(error);
     }
     this.pendingEventWaits.clear();
+    return cancelled;
   }
 }