diff --git a/src/v1.test.ts b/src/v1.test.ts
index d40a70a..0bbe47f 100644
--- a/src/v1.test.ts
+++ b/src/v1.test.ts
@@ -18,6 +18,7 @@ import {
   LookupSubjectsResponse,
   NewClient,
   ObjectReference,
+  PermissionsServiceClient,
   Relationship,
   RelationshipUpdate,
   RelationshipUpdate_Operation,
@@ -25,8 +26,10 @@ import {
   WriteRelationshipsRequest,
   WriteRelationshipsResponse,
   WriteSchemaRequest,
+  createStructFromObject,
+  PbNullValue,
 } from "./v1.js";
-import { describe, it, expect, beforeEach } from "vitest";
+import { describe, it, expect, beforeEach, vi } from "vitest";
 
 describe("a check with an unknown namespace", () => {
   it("should raise a failed precondition", () =>
@@ -681,4 +684,219 @@ describe("Experimental Service", () => {
         });
       });
     }));
+
+  describe("WriteRelationships with transaction metadata (Integration Test)", () => {
+    it("should successfully write relationships with metadata and verify metadata transmission", () =>
+      new Promise<void>((done, fail) => {
+        const testToken = generateTestToken("v1-int-tx-metadata");
+        const client = NewClient(
+          testToken,
+          "localhost:50051",
+          ClientSecurity.INSECURE_LOCALHOST_ALLOWED,
+          PreconnectServices.SCHEMA_SERVICE |
+            PreconnectServices.PERMISSIONS_SERVICE,
+        );
+
+        const writeSpy = vi.spyOn(
+          PermissionsServiceClient.prototype,
+          "writeRelationships",
+        );
+
+        const schema = `
+        definition test/user {}
+        definition test/document {
+          relation viewer: test/user
+          permission view = viewer
+        }
+      `;
+        const writeSchemaRequest = WriteSchemaRequest.create({ schema });
+
+        client.writeSchema(writeSchemaRequest, (schemaErr, schemaResponse) => {
+          if (schemaErr) {
+            client.close();
+            fail(schemaErr);
+            return;
+          }
+          expect(schemaResponse).toBeDefined();
+
+          const uniqueSuffix = Date.now();
+          const resource = ObjectReference.create({
+            objectType: "test/document",
+            objectId: `doc-${uniqueSuffix}`,
+          });
+
+          const user = ObjectReference.create({
+            objectType: "test/user",
+            objectId: `user-${uniqueSuffix}`,
+          });
+
+          const updates = [
+            RelationshipUpdate.create({
+              relationship: Relationship.create({
+                resource,
+                relation: "viewer",
+                subject: SubjectReference.create({ object: user }),
+              }),
+              operation: RelationshipUpdate_Operation.CREATE,
+            }),
+          ];
+
+          const metadataObject = {
+            transaction_id: "test-tx-123",
+            other_data: "sample",
+          };
+          const transactionMetadata = createStructFromObject(metadataObject);
+
+          const writeRequest = WriteRelationshipsRequest.create({
+            updates,
+            optionalTransactionMetadata: transactionMetadata,
+          });
+
+          client.writeRelationships(writeRequest, (err, response) => {
+            if (err) {
+              client.close();
+              fail(err);
+              return;
+            }
+
+            expect(err).toBeNull();
+            expect(response).toBeDefined();
+            expect(response?.writtenAt).toBeDefined();
+
+            expect(writeSpy).toHaveBeenCalledTimes(1);
+
+            const actualRequest = writeSpy.mock
+              .calls[0][0] as WriteRelationshipsRequest;
+
+            expect(actualRequest.updates).toEqual(updates);
+
+            expect(actualRequest.optionalTransactionMetadata).toBeDefined();
+            expect(actualRequest.optionalTransactionMetadata).toEqual(
+              transactionMetadata,
+            );
+
+            const transactionIdField =
+              actualRequest.optionalTransactionMetadata?.fields?.[
+                "transaction_id"
+              ];
+            expect(transactionIdField?.kind?.oneofKind).toBe("stringValue");
+            if (transactionIdField?.kind?.oneofKind === "stringValue") {
+              expect(transactionIdField.kind.stringValue).toBe("test-tx-123");
+            }
+
+            const otherDataField =
+              actualRequest.optionalTransactionMetadata?.fields?.["other_data"];
+            expect(otherDataField?.kind?.oneofKind).toBe("stringValue");
+            if (otherDataField?.kind?.oneofKind === "stringValue") {
+              expect(otherDataField.kind.stringValue).toBe("sample");
+            }
+
+            client.close();
+            done();
+          });
+        });
+      }));
+  });
+});
+
+describe("createStructFromObject unit tests", () => {
+  it("should convert a simple JS object with primitive types", () => {
+    const obj = {
+      stringProp: "hello",
+      numberProp: 123,
+      booleanProp: true,
+    };
+    const struct = createStructFromObject(obj);
+    expect(struct.fields.stringProp?.kind.oneofKind).toBe("stringValue");
+    expect(
+      struct.fields.stringProp?.kind.oneofKind === "stringValue" &&
+        struct.fields.stringProp?.kind.stringValue,
+    ).toBe("hello");
+    expect(struct.fields.numberProp?.kind.oneofKind).toBe("numberValue");
+    expect(
+      struct.fields.numberProp?.kind.oneofKind === "numberValue" &&
+        struct.fields.numberProp?.kind.numberValue,
+    ).toBe(123);
+    expect(struct.fields.booleanProp?.kind.oneofKind).toBe("boolValue");
+    expect(
+      struct.fields.booleanProp?.kind.oneofKind === "boolValue" &&
+        struct.fields.booleanProp?.kind.boolValue,
+    ).toBe(true);
+  });
+
+  it("should convert a JS object with null values", () => {
+    const obj = {
+      nullProp: null,
+    };
+    const struct = createStructFromObject(obj);
+    expect(struct.fields.nullProp?.kind.oneofKind).toBe("nullValue");
+    expect(
+      struct.fields.nullProp?.kind.oneofKind === "nullValue" &&
+        struct.fields.nullProp?.kind.nullValue,
+    ).toBe(PbNullValue.NULL_VALUE);
+  });
+
+  it("should convert a JS object with nested objects", () => {
+    const obj = {
+      nestedProp: {
+        innerString: "world",
+        innerNumber: 456,
+      },
+    };
+    const struct = createStructFromObject(obj);
+    const nestedStruct =
+      struct.fields.nestedProp?.kind.oneofKind === "structValue" &&
+      struct.fields.nestedProp.kind.structValue;
+    expect(nestedStruct).toBeTruthy();
+    if (nestedStruct) {
+      expect(nestedStruct.fields.innerString?.kind.oneofKind).toBe(
+        "stringValue",
+      );
+      expect(
+        nestedStruct.fields.innerString?.kind.oneofKind === "stringValue" &&
+          nestedStruct.fields.innerString?.kind.stringValue,
+      ).toBe("world");
+      expect(nestedStruct.fields.innerNumber?.kind.oneofKind).toBe(
+        "numberValue",
+      );
+      expect(
+        nestedStruct.fields.innerNumber?.kind.oneofKind === "numberValue" &&
+          nestedStruct.fields.innerNumber?.kind.numberValue,
+      ).toBe(456);
+    }
+  });
+
+  it("should convert an empty JS object to an empty Struct", () => {
+    const obj = {};
+    const struct = createStructFromObject(obj);
+    expect(Object.keys(struct.fields).length).toBe(0);
+  });
+
+  it("should throw an error for null input", () => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect(() => createStructFromObject(null as any)).toThrow(
+      "Input data for createStructFromObject must be a non-null object.",
+    );
+  });
+
+  it("should throw an error for non-object input (string)", () => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect(() => createStructFromObject("not an object" as any)).toThrow(
+      "Input data for createStructFromObject must be a non-null object.",
+    );
+  });
+
+  it("should throw an error for non-object input (number)", () => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect(() => createStructFromObject(123 as any)).toThrow(
+      "Input data for createStructFromObject must be a non-null object.",
+    );
+  });
+
+  it("should throw an error for array input", () => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    expect(() => createStructFromObject([] as any)).toThrow(
+      "Input data for createStructFromObject must be a non-null object.",
+    );
+  });
 });
diff --git a/src/v1.ts b/src/v1.ts
index 376eb70..55bbec7 100644
--- a/src/v1.ts
+++ b/src/v1.ts
@@ -19,6 +19,13 @@ import {
 } from "./util.js";
 
 import type { OmitBaseMethods, PromisifiedClient } from "./types.js";
+import {
+  Struct as ImportedPbStruct,
+  NullValue as ImportedPbNullValue,
+} from "./authzedapi/google/protobuf/struct.js";
+import type { JsonObject } from "@protobuf-ts/runtime";
+
+export { ImportedPbStruct as PbStruct, ImportedPbNullValue as PbNullValue };
 
 // A merge of the three generated gRPC clients, with their base methods omitted
 export type ZedDefaultClientInterface = OmitBaseMethods<
@@ -397,6 +404,30 @@ export function NewClientWithChannelCredentials(
 ): ZedClientInterface {
   return ZedCombinedClient.create(endpoint, creds, preconnect, options);
 }
+/**
+ * Creates a google.protobuf.Struct object suitable for use as
+ * optionalTransactionMetadata in WriteRelationshipsRequest.
+ *
+ * @param data A simple JavaScript object (e.g., { key: "value" }) to be converted into a Struct.
+ * @returns A google.protobuf.Struct object.
+ */
+export function createStructFromObject(data: JsonObject): ImportedPbStruct {
+  try {
+    return ImportedPbStruct.fromJson(data);
+  } catch (error) {
+    if (
+      error instanceof Error &&
+      error.message.includes(
+        "Unable to parse message google.protobuf.Struct from JSON",
+      )
+    ) {
+      throw new Error(
+        "Input data for createStructFromObject must be a non-null object.",
+      );
+    }
+    throw error;
+  }
+}
 
 export * from "./authzedapi/authzed/api/v1/core.js";
 export * from "./authzedapi/authzed/api/v1/experimental_service.js";