feat(companion): expose platform connected state passthrough

README.md

@@ -1199,7 +1199,7 @@ Companion runtime helper:
   - shared `publishHeartbeat()` helper for periodic `node.status.set` updates with safe defaults
   - `createHeartbeatLoop()` convenience helper that returns a bound `CompanionHeartbeatLoop`
   - optional `defaultSessionId` for canvas helper calls so `sessionId` can be omitted per call
-  - `dispose()` lifecycle helper for unified runtime teardown
+  - lifecycle passthroughs for connection state/teardown (`connected`, `dispose()`)
   - stream passthrough helpers (`subscribeEvents`, `subscribeEvent`, `clearEventSubscriptions`, `listKnownEventNames`, `eventSubscriptionCount`, `subscribeAgentStream/Typing/ContextWarning`, `waitForEvent`, `waitForAnyEvent`, `waitForAgentStream/Typing/ContextWarning`)
 - `src/companion/heartbeatLoop.ts` provides `CompanionHeartbeatLoop` for periodic heartbeat scheduling (`publishHeartbeat`) with start/stop safety, optional interval jitter (`jitterRatio`) to spread load, `tickNow()` for manual sends, success/error hooks, failure observability (`failureCount`, `lastFailure`, `getState()`), and optional auto-stop after repeated failures.
 

docs/plans/state.json

@@ -699,6 +699,19 @@
       ],
       "test_status": "pnpm test:run src/companion/platformClients.test.ts src/companion/runtimeClient.test.ts src/companion/heartbeatLoop.test.ts src/companion/platformClients.integration.test.ts + pnpm typecheck passing"
     },
+    "companion-platform-connected-state-passthrough": {
+      "status": "completed",
+      "date": "2026-02-17",
+      "updated": "2026-02-17",
+      "summary": "Added `connected` passthrough getters on platform companion clients so wrappers expose runtime WebSocket connectivity state for lightweight health checks and flow guards.",
+      "files_modified": [
+        "src/companion/platformClients.ts",
+        "src/companion/platformClients.test.ts",
+        "README.md",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/companion/platformClients.test.ts src/companion/runtimeClient.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",

src/companion/platformClients.test.ts

@@ -38,6 +38,7 @@ function createRuntimeMock(): {
   waitForContextWarning: ReturnType<typeof vi.fn>;
   waitForAnyEvent: ReturnType<typeof vi.fn>;
   eventSubscriptionCount: number;
+  connected: boolean;
 } {
   const connect = vi.fn(async () => undefined);
   const disconnect = vi.fn(() => undefined);
@@ -76,6 +77,7 @@ function createRuntimeMock(): {
   const waitForContextWarning = vi.fn(async () => ({ thresholdPct: 75, estimatedPct: 90 }));
   const waitForAnyEvent = vi.fn(async () => ({ event: 'agent.stream', data: { token: 'any' } }));
   const eventSubscriptionCount = 3;
+  const connected = true;
 
   const runtime = {
     connect,
@@ -110,6 +112,9 @@ function createRuntimeMock(): {
     get eventSubscriptionCount() {
       return eventSubscriptionCount;
     },
+    get connected() {
+      return connected;
+    },
   } as unknown as CompanionRuntimeClient;
 
   return {
@@ -144,6 +149,7 @@ function createRuntimeMock(): {
     waitForContextWarning,
     waitForAnyEvent,
     eventSubscriptionCount,
+    connected,
   };
 }
 
@@ -204,6 +210,13 @@ describe('platform companion clients', () => {
     expect(mock.dispose).toHaveBeenCalledOnce();
   });
 
+  it('platform connected getter forwards to runtime connected state', async () => {
+    const mock = createRuntimeMock();
+    const client = new MacOSCompanionClient({ runtime: mock.runtime, nodeId: 'mac-node' });
+
+    expect(client.connected).toBe(mock.connected);
+  });
+
   it('platform stream helper methods forward to runtime client', async () => {
     const mock = createRuntimeMock();
     const client = new AndroidCompanionClient({ runtime: mock.runtime, nodeId: 'android-node' });

src/companion/platformClients.ts

@@ -101,6 +101,10 @@ export class MacOSCompanionClient {
     return this.runtime.connect();
   }
 
+  get connected(): boolean {
+    return this.runtime.connected;
+  }
+
   disconnect(): void {
     this.runtime.disconnect();
   }
@@ -339,6 +343,10 @@ export class IOSCompanionClient {
     return this.runtime.connect();
   }
 
+  get connected(): boolean {
+    return this.runtime.connected;
+  }
+
   disconnect(): void {
     this.runtime.disconnect();
   }
@@ -577,6 +585,10 @@ export class AndroidCompanionClient {
     return this.runtime.connect();
   }
 
+  get connected(): boolean {
+    return this.runtime.connected;
+  }
+
   disconnect(): void {
     this.runtime.disconnect();
   }