fix: accept external Workdirs in Browser subscriptions

crates/protocol/src/typescript.rs

@@ -214,6 +214,8 @@ fn rust_serialized_subscription_frame_fixtures() -> Vec<SubscriptionFrame> {
         SubscriptionId::new("fixture-subscription").expect("fixture subscription id must be valid");
     let worker_id =
         SubscriptionWorkerId::new("fixture-worker").expect("fixture worker id must be valid");
+    let external_workdir_id = SubscriptionWorkdirId::new("fixture-external-workdir")
+        .expect("fixture external Workdir id must be valid");
     let worker = SubscriptionWorker {
         worker_id: worker_id.clone(),
         runtime_id: Some("fixture-runtime".to_string()),
@@ -226,7 +228,12 @@ fn rust_serialized_subscription_frame_fixtures() -> Vec<SubscriptionFrame> {
         workspace_id: Some("fixture-workspace".to_string()),
         display_name: None,
         profile: None,
-        workdir_attachments: Vec::new(),
+        workdir_attachments: vec![SubscriptionWorkerWorkdirAttachment {
+            alias: "external".to_string(),
+            repository_id: None,
+            repository_key: None,
+            working_directory_id: external_workdir_id,
+        }],
     };
     let subscribed = SubscriptionFrame::new(SubscriptionFramePayload::Response(
         SubscriptionResponse::Subscribed {

crates/protocol/src/typescript_validator_template.ts

@@ -391,8 +391,7 @@ function validateWorker(worker: SubscriptionWorker): boolean {
     if (
       !validateIdentifier(attachment.alias, MAX_RESOURCE_ID_BYTES) ||
       !validateIdentifier(attachment.working_directory_id, MAX_RESOURCE_ID_BYTES) ||
-      attachment.repository_key == null ||
-      !validateRepositoryKey(attachment.repository_key) ||
+      (attachment.repository_key != null && !validateRepositoryKey(attachment.repository_key)) ||
       aliases.has(attachment.alias) ||
       workdirIds.has(attachment.working_directory_id)
     ) {

web/workspace/src/lib/workspace/protocol-validator.test.ts

@@ -42,6 +42,37 @@ Deno.test('generated subscription validator accepts a current exact frame', () =
   assert(result.value.frame === 'response', 'expected response frame');
 });
 
+Deno.test('generated subscription validator accepts an external Workdir Worker', () => {
+  const result = decode(subscribedFrame({
+    snapshot: {
+      topic: 'workers',
+      data: {
+        workers: [
+          {
+            worker_id: 'worker-1',
+            runtime_id: 'runtime-1',
+            resource_key: 'worker-resource-1',
+            availability: 'observed',
+            subject_revision: 1,
+            state: 'idle',
+            has_running_internal_workers: false,
+            workspace_id: 'workspace-1',
+            display_name: 'Companion',
+            profile: 'companion',
+            workdir_attachments: [
+              {
+                alias: 'workspace',
+                working_directory_id: 'external-workdir-1',
+              },
+            ],
+          },
+        ],
+      },
+    },
+  }));
+  assert(result.ok, `external Workdir Worker was rejected: ${JSON.stringify(result)}`);
+});
+
 Deno.test('Rust-serialized compatibility fixtures satisfy the generated Browser contract', () => {
   for (const fixture of RUST_SERIALIZED_SUBSCRIPTION_FRAME_FIXTURES) {
     const result = decode(fixture);