diff --git a/packages/google-cloud-tpu/linkinator.config.json b/packages/google-cloud-tpu/linkinator.config.json
index 97b6eaaa0df..29a223b6db6 100644
--- a/packages/google-cloud-tpu/linkinator.config.json
+++ b/packages/google-cloud-tpu/linkinator.config.json
@@ -1,7 +1,6 @@
 {
   "recurse": true,
   "skip": [
-    "https://github.com/googleapis/nodejs-cloud-tpu/blob/master/CHANGELOG.md",
     "https://codecov.io/gh/googleapis/",
     "www.googleapis.com",
     "img.shields.io"
diff --git a/packages/google-cloud-tpu/src/v1/tpu_client.ts b/packages/google-cloud-tpu/src/v1/tpu_client.ts
index d38645388a2..545bf098fcd 100644
--- a/packages/google-cloud-tpu/src/v1/tpu_client.ts
+++ b/packages/google-cloud-tpu/src/v1/tpu_client.ts
@@ -409,7 +409,7 @@ export class TpuClient {
   // -- Service calls --
   // -------------------
   getNode(
-    request: protos.google.cloud.tpu.v1.IGetNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IGetNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -453,7 +453,7 @@ export class TpuClient {
    * const [response] = await client.getNode(request);
    */
   getNode(
-    request: protos.google.cloud.tpu.v1.IGetNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IGetNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -492,7 +492,7 @@ export class TpuClient {
     return this.innerApiCalls.getNode(request, options, callback);
   }
   getTensorFlowVersion(
-    request: protos.google.cloud.tpu.v1.IGetTensorFlowVersionRequest,
+    request?: protos.google.cloud.tpu.v1.IGetTensorFlowVersionRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -540,7 +540,7 @@ export class TpuClient {
    * const [response] = await client.getTensorFlowVersion(request);
    */
   getTensorFlowVersion(
-    request: protos.google.cloud.tpu.v1.IGetTensorFlowVersionRequest,
+    request?: protos.google.cloud.tpu.v1.IGetTensorFlowVersionRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -583,7 +583,7 @@ export class TpuClient {
     return this.innerApiCalls.getTensorFlowVersion(request, options, callback);
   }
   getAcceleratorType(
-    request: protos.google.cloud.tpu.v1.IGetAcceleratorTypeRequest,
+    request?: protos.google.cloud.tpu.v1.IGetAcceleratorTypeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -627,7 +627,7 @@ export class TpuClient {
    * const [response] = await client.getAcceleratorType(request);
    */
   getAcceleratorType(
-    request: protos.google.cloud.tpu.v1.IGetAcceleratorTypeRequest,
+    request?: protos.google.cloud.tpu.v1.IGetAcceleratorTypeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -669,7 +669,7 @@ export class TpuClient {
   }
 
   createNode(
-    request: protos.google.cloud.tpu.v1.ICreateNodeRequest,
+    request?: protos.google.cloud.tpu.v1.ICreateNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -729,7 +729,7 @@ export class TpuClient {
    * const [response] = await operation.promise();
    */
   createNode(
-    request: protos.google.cloud.tpu.v1.ICreateNodeRequest,
+    request?: protos.google.cloud.tpu.v1.ICreateNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -814,7 +814,7 @@ export class TpuClient {
     >;
   }
   deleteNode(
-    request: protos.google.cloud.tpu.v1.IDeleteNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IDeleteNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -870,7 +870,7 @@ export class TpuClient {
    * const [response] = await operation.promise();
    */
   deleteNode(
-    request: protos.google.cloud.tpu.v1.IDeleteNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IDeleteNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -955,7 +955,7 @@ export class TpuClient {
     >;
   }
   reimageNode(
-    request: protos.google.cloud.tpu.v1.IReimageNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IReimageNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1013,7 +1013,7 @@ export class TpuClient {
    * const [response] = await operation.promise();
    */
   reimageNode(
-    request: protos.google.cloud.tpu.v1.IReimageNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IReimageNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -1098,7 +1098,7 @@ export class TpuClient {
     >;
   }
   stopNode(
-    request: protos.google.cloud.tpu.v1.IStopNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IStopNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1154,7 +1154,7 @@ export class TpuClient {
    * const [response] = await operation.promise();
    */
   stopNode(
-    request: protos.google.cloud.tpu.v1.IStopNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IStopNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -1239,7 +1239,7 @@ export class TpuClient {
     >;
   }
   startNode(
-    request: protos.google.cloud.tpu.v1.IStartNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IStartNodeRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1295,7 +1295,7 @@ export class TpuClient {
    * const [response] = await operation.promise();
    */
   startNode(
-    request: protos.google.cloud.tpu.v1.IStartNodeRequest,
+    request?: protos.google.cloud.tpu.v1.IStartNodeRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -1380,7 +1380,7 @@ export class TpuClient {
     >;
   }
   listNodes(
-    request: protos.google.cloud.tpu.v1.IListNodesRequest,
+    request?: protos.google.cloud.tpu.v1.IListNodesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1431,7 +1431,7 @@ export class TpuClient {
    *   for more details and examples.
    */
   listNodes(
-    request: protos.google.cloud.tpu.v1.IListNodesRequest,
+    request?: protos.google.cloud.tpu.v1.IListNodesRequest,
     optionsOrCallback?:
       | CallOptions
       | PaginationCallback<
@@ -1563,7 +1563,7 @@ export class TpuClient {
     ) as AsyncIterable<protos.google.cloud.tpu.v1.INode>;
   }
   listTensorFlowVersions(
-    request: protos.google.cloud.tpu.v1.IListTensorFlowVersionsRequest,
+    request?: protos.google.cloud.tpu.v1.IListTensorFlowVersionsRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1622,7 +1622,7 @@ export class TpuClient {
    *   for more details and examples.
    */
   listTensorFlowVersions(
-    request: protos.google.cloud.tpu.v1.IListTensorFlowVersionsRequest,
+    request?: protos.google.cloud.tpu.v1.IListTensorFlowVersionsRequest,
     optionsOrCallback?:
       | CallOptions
       | PaginationCallback<
@@ -1770,7 +1770,7 @@ export class TpuClient {
     ) as AsyncIterable<protos.google.cloud.tpu.v1.ITensorFlowVersion>;
   }
   listAcceleratorTypes(
-    request: protos.google.cloud.tpu.v1.IListAcceleratorTypesRequest,
+    request?: protos.google.cloud.tpu.v1.IListAcceleratorTypesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -1829,7 +1829,7 @@ export class TpuClient {
    *   for more details and examples.
    */
   listAcceleratorTypes(
-    request: protos.google.cloud.tpu.v1.IListAcceleratorTypesRequest,
+    request?: protos.google.cloud.tpu.v1.IListAcceleratorTypesRequest,
     optionsOrCallback?:
       | CallOptions
       | PaginationCallback<