diff --git a/docs/plans/state.json b/docs/plans/state.json
index a133f37..d57a20d 100644
--- a/docs/plans/state.json
+++ b/docs/plans/state.json
@@ -1081,6 +1081,17 @@
       ],
       "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"
     },
+    "companion-cancel-pending-waits-count-integration-coverage": {
+      "status": "completed",
+      "date": "2026-02-17",
+      "updated": "2026-02-17",
+      "summary": "Added platform integration assertions for `cancelPendingEventWaits()` count-return semantics (`1` for active waiters, `0` after drain).",
+      "files_modified": [
+        "src/companion/platformClients.integration.test.ts",
+        "docs/plans/state.json"
+      ],
+      "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"
+    },
     "browser-tools-activation-clarity": {
       "status": "completed",
       "date": "2026-02-17",
diff --git a/src/companion/platformClients.integration.test.ts b/src/companion/platformClients.integration.test.ts
index 6769ef5..a4d3f2e 100644
--- a/src/companion/platformClients.integration.test.ts
+++ b/src/companion/platformClients.integration.test.ts
@@ -217,10 +217,12 @@ describe('platform clients integration', () => {
     ).rejects.toThrow('manual cancel');
     expect(client.pendingEventWaitCount).toBe(1);
 
-    client.cancelPendingEventWaits('manual cancel');
+    const cancelled = client.cancelPendingEventWaits('manual cancel');
     await awaited;
+    expect(cancelled).toBe(1);
     expect(client.pendingEventWaitCount).toBe(0);
     expect(client.eventSubscriptionCount).toBe(1);
+    expect(client.cancelPendingEventWaits()).toBe(0);
 
     unsubscribe();
     expect(client.eventSubscriptionCount).toBe(0);