diff --git a/packages/shared/src/validators/approval.test.ts b/packages/shared/src/validators/approval.test.ts
index 15034d7001d..051d29b2740 100644
--- a/packages/shared/src/validators/approval.test.ts
+++ b/packages/shared/src/validators/approval.test.ts
@@ -6,6 +6,20 @@ import {
 } from "./approval.js";
 
 describe("approval validators", () => {
+  it("passes real line breaks through unchanged", () => {
+    expect(addApprovalCommentSchema.parse({ body: "Looks good\n\nApproved." }).body)
+      .toBe("Looks good\n\nApproved.");
+    expect(resolveApprovalSchema.parse({ decisionNote: "Decision\n\nApproved." }).decisionNote)
+      .toBe("Decision\n\nApproved.");
+  });
+
+  it("accepts null and omitted optional decision notes", () => {
+    expect(resolveApprovalSchema.parse({ decisionNote: null }).decisionNote).toBeNull();
+    expect(resolveApprovalSchema.parse({}).decisionNote).toBeUndefined();
+    expect(requestApprovalRevisionSchema.parse({ decisionNote: null }).decisionNote).toBeNull();
+    expect(requestApprovalRevisionSchema.parse({}).decisionNote).toBeUndefined();
+  });
+
   it("normalizes escaped line breaks in approval comments and decision notes", () => {
     expect(addApprovalCommentSchema.parse({ body: "Looks good\\n\\nApproved." }).body)
       .toBe("Looks good\n\nApproved.");
diff --git a/packages/shared/src/validators/issue.test.ts b/packages/shared/src/validators/issue.test.ts
index 4f1ecf45141..4fa908e40cb 100644
--- a/packages/shared/src/validators/issue.test.ts
+++ b/packages/shared/src/validators/issue.test.ts
@@ -9,6 +9,24 @@ import {
 } from "./issue.js";
 
 describe("issue validators", () => {
+  it("passes real line breaks through unchanged", () => {
+    const parsed = createIssueSchema.parse({
+      title: "Follow up PR",
+      description: "Line 1\n\nLine 2",
+    });
+
+    expect(parsed.description).toBe("Line 1\n\nLine 2");
+  });
+
+  it("accepts null and omitted optional multiline issue fields", () => {
+    expect(createIssueSchema.parse({ title: "Follow up PR", description: null }).description)
+      .toBeNull();
+    expect(createIssueSchema.parse({ title: "Follow up PR" }).description)
+      .toBeUndefined();
+    expect(updateIssueSchema.parse({ comment: undefined }).comment)
+      .toBeUndefined();
+  });
+
   it("normalizes JSON-escaped line breaks in issue descriptions", () => {
     const parsed = createIssueSchema.parse({
       title: "Follow up PR",